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1 pages, 125 KiB

Open AccessAbstract

Ablative Laser Structuring for Stretchable Multilayer and Multi-Material Electronics and Sensor Systems

by Simon P. Stier and Holger Böse

Proceedings 2020, 56(1), 21; https://doi.org/10.3390/proceedings2020056021 - 17 Dec 2020

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Abstract

Conventional machining and shaping processes for polymers and elastomers such as injection molding exhibit significant disadvantages, as specific tools have to be manufactured, the method of machining is highly dependent on the material properties, and the cost of automation is usually high. Therefore, [...] Read more.

Conventional machining and shaping processes for polymers and elastomers such as injection molding exhibit significant disadvantages, as specific tools have to be manufactured, the method of machining is highly dependent on the material properties, and the cost of automation is usually high. Therefore, additive manufacturing processes (3D printing) have established themselves as an alternative. This eliminates the expensive production of tools and the production is individualized. However, the specific (additive) manufacturing process remains highly dependent on the properties of the material. These processes include selective laser sintering (SLS) for powdered thermoplastic polymers and metals, extrusion such as fused deposition modeling (FDM) for thermoplastic polymers in wire form, or optical curing such as digital light processing (DLP) for liquid resins. Especially for elastomer sensors or circuit boards (structure of several alternately constituted approx. 100 µm-thick elastomer films made with different types of liquid silicone rubber), there is no suitable additive manufacturing process that combines liquid, partly non-transparent source materials, multi-component printing, and very fine layer thicknesses. In order to enable a largely automated, computer-aided manufacturing process, we have developed the concept of ablative multilayer and multi-material laser-assisted manufacturing. Here, the layers (conductive and non-conductive elastomers, as well as metal layers for contacting) are first coated over the entire surface (e.g., spray, dip, or doctor blade coating, as well as galvanic coating) and then selectively removed with a CO₂ or fiber laser. These steps are repeated several times to achieve a multi-layer structured design. Is it not only possible to adjust and improve the work previously carried out manually, but also to introduce completely new concepts, such as fine through-plating between the layers to enable much more compact structures to be possible. As an exemplary application, we have used the process for manufacturing a thin and surface solderable pressure sensor and a stretchable circuit board. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

1 pages, 121 KiB

Open AccessAbstract

Electronic Multiscale Hybrid Materials: Sinter-Free Inks, Printed Transparent Grids, and Soft Devices

by Tobias Kraus

Proceedings 2020, 56(1), 24; https://doi.org/10.3390/proceedings2020056024 - 18 Dec 2020

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Abstract

Hybrid electronic materials combine the excellent electronic properties of metals and semiconductors with the mechanical flexibility, ease of processing, and optical transparency of polymers. This talk will discuss hybrids that combine organic and inorganic components at different scales. Metallic and semiconductor nanoparticle cores [...] Read more.

Hybrid electronic materials combine the excellent electronic properties of metals and semiconductors with the mechanical flexibility, ease of processing, and optical transparency of polymers. This talk will discuss hybrids that combine organic and inorganic components at different scales. Metallic and semiconductor nanoparticle cores are coated with conductive polymer shells to create “hybrid inks” that can be inkjet-printed and form conductive leads without any sintering step. Transparent electrodes are printed using ultrathin metal nanowires with core diameters below 2 nm. The chemically synthesized wires spontaneously form percolating structures when patterned with a soft stamp; this rapidly yields optically transparent grid electrodes, even on demanding soft substrates. These new hybrid electronic materials enable the fabrication of soft electronics, including flexible sensors on polymer foils, radio-frequency identification (RFID) antennae on cardboard, and soft human–machine interfaces. Selected devices will be covered at the end of the talk. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

Other

Jump to: Research

3 pages, 493 KiB

Open AccessProceeding Paper

Functionalisation of Multi-Layer Graphene-Based Gas Sensor by Au Nanoparticles

by Laura Morelli, Filiberto Ricciardella, Max Koole, Stefan Persijn and Sten Vollebregt

Proceedings 2020, 56(1), 1; https://doi.org/10.3390/proceedings2020056001 - 7 Dec 2020

Cited by 1 | Viewed by 1585

Abstract

A novel gas sensor based on multi-layered graphene (MLG) functionalised with gold nanoparticles (Au-NPs) is presented. We demonstrate for the first time that: (1) the signal saturates during the analyte exposure, something which does not occur in the pristine material and in graphene-based [...] Read more.

A novel gas sensor based on multi-layered graphene (MLG) functionalised with gold nanoparticles (Au-NPs) is presented. We demonstrate for the first time that: (1) the signal saturates during the analyte exposure, something which does not occur in the pristine material and in graphene-based gas sensors in general; (2) the sign of the device current response is inverted. MLG is grown by chemical vapour deposition on pre-patterned CMOS-compatible Mo catalyst. The sensor is fabricated directly on the growth substrate, without any transfer of MLG. The Au-NPs are later deposited from an aerosol on the sensor at a specific controlled location, mitigating any additional patterning steps. The functionalised sensor is tested with 1 ppm (part-per-million) of NO₂ at room temperature. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 620 KiB

Open AccessProceeding Paper

Functionalized SnO₂ Sensors on Flexible Substrate for Ammonia Detection at Low Temperature

by Jean-Paul Viricelle, Mohamad Hijazi, Valérie Stambouli, Omar Kassem, Mohamed Saadaoui, Mathilde Rieu and Christophe Pijolat

Proceedings 2020, 56(1), 2; https://doi.org/10.3390/proceedings2020056002 - 7 Dec 2020

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Abstract

Ammonia detection at ambient with low-cost sensors is a challenge for various applications like breath analysis and agriculture. Such a challenge can be reached with functionalized SnO₂ based gas sensors using silanization by 3-aminopropyltriethoxysilane (APTES) as an intermediate step before grafting with [...] Read more.

Ammonia detection at ambient with low-cost sensors is a challenge for various applications like breath analysis and agriculture. Such a challenge can be reached with functionalized SnO₂ based gas sensors using silanization by 3-aminopropyltriethoxysilane (APTES) as an intermediate step before grafting with functional end group providing selectivity for the target gas. Moreover, operation at room temperature gives the opportunity to develop a sensor on a plastic substrate entirely manufactured by inkjet technology, by developing suitable inks, in particular to obtain SnO₂ sensing element. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 348 KiB

Open AccessProceeding Paper

Miniaturized Thermal Acoustic Gas Sensor Based on a CMOS Microhotplate and MEMS Microphone

by Richard Hopper, Daniel Popa, Vasileios Tsoutsouras, Florin Udrea and Phillip Stanley-Marbell

Proceedings 2020, 56(1), 3; https://doi.org/10.3390/proceedings2020056003 - 7 Dec 2020

Viewed by 1467

Abstract

In this work, we present a novel thermal acoustic gas sensor, fabricated using a CMOS microhotplate and MEMS microphone. The sensing mechanism is based on the detection of changes in the thermal acoustic conversion efficiency which is dependent on the physical properties of [...] Read more.

In this work, we present a novel thermal acoustic gas sensor, fabricated using a CMOS microhotplate and MEMS microphone. The sensing mechanism is based on the detection of changes in the thermal acoustic conversion efficiency which is dependent on the physical properties of the gas. The gas sensor has all the benefits of CMOS technology, including low cost and miniaturization. Here, we demonstrate its application for CO₂ gas detection. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 176 KiB

Open AccessExtended Abstract

Superconducting Nanowire Devices for Light Detection at the Single-Photon Level

by Stephan Steinhauer, Samuel Gyger, Ali W. Elshaari, Julien Zichi, Iman Esmaeil Zadeh, Jin Chang, Johannes W. N. Los, Nima Kalhor, Sander Dorenbos and Val Zwiller

Proceedings 2020, 56(1), 4; https://doi.org/10.3390/proceedings2020056004 - 8 Dec 2020

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Abstract

Superconducting nanowire single photon detectors (SNSPDs) have become a mature technology for single-photon detection with excellent performance [...] Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

3 pages, 341 KiB

Open AccessExtended Abstract

ChipScope Symposium: Novel Approaches for a Chip-Sized Optical Microscope

by Angel Diéguez, Steffen Bornemann, Katarzyna Kluczyk-Korch, Kateryna Trofymchuk, Viktorija Glembockyte and Stefan Schrittwieser

Proceedings 2020, 56(1), 5; https://doi.org/10.3390/proceedings2020056005 - 9 Dec 2020

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Abstract

In the Chipscope project funded by the EU, a completely new strategy towards optical microscopy is explored by a team of researchers from different European institutions. In this workshop, the different researchers of the project will explain the last advances obtained in the [...] Read more.

In the Chipscope project funded by the EU, a completely new strategy towards optical microscopy is explored by a team of researchers from different European institutions. In this workshop, the different researchers of the project will explain the last advances obtained in the project, presenting the microscopes, how light emission is produced, and the detection principles and simulations. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 578 KiB

Open AccessProceeding Paper

An Embedded, Low-Power, Wireless NO₂ Gas-Sensing Platform Based on a Single-Walled Carbon Nanotube Transducer

by Stefan Nedelcu, Sebastian Eberle, Cosmin Roman and Christofer Hierold

Proceedings 2020, 56(1), 6; https://doi.org/10.3390/proceedings2020056006 - 10 Dec 2020

Cited by 1 | Viewed by 1176

Abstract

This work proposes a portable, software-defined NO₂-sensing platform, which is able to acquire currents ranging from nA to µA from a Single-Walled Carbon Nanotube (SWCNT) gas sensor. It includes an embedded software that steers the system allowing dynamical adjustments of the [...] Read more.

This work proposes a portable, software-defined NO₂-sensing platform, which is able to acquire currents ranging from nA to µA from a Single-Walled Carbon Nanotube (SWCNT) gas sensor. It includes an embedded software that steers the system allowing dynamical adjustments of the SWCNT bias levels, measurement range, sampling rate and of measurement time intervals. Further, the embedded functions can post-process the measurement results, log data on an SD card or send data via a wireless connection. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 320 KiB

Open AccessProceeding Paper

Current Perspectives for Autonomous Sensor Nodes

by Marco Deluca and Anton Köck

Proceedings 2020, 56(1), 7; https://doi.org/10.3390/proceedings2020056007 - 10 Dec 2020

Cited by 1 | Viewed by 1190

Abstract

The current technological trends associated with Industry 4.0 and the Internet of Things (IoT) require an interconnected network of sensor nodes providing distributed information on the environment to enable intelligent action to be taken by control systems. Such sensors need to be wireless, [...] Read more.

The current technological trends associated with Industry 4.0 and the Internet of Things (IoT) require an interconnected network of sensor nodes providing distributed information on the environment to enable intelligent action to be taken by control systems. Such sensors need to be wireless, self-powered and energy independent. In this work we provide an overview of possible strategies to realize a positive energy balance in autonomous sensor nodes without the use of batteries. We will first overview different sensors in terms of power consumption. We will then concentrate on energy harvesting and storage, showing state-of-the-art possibilities in both cases. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 411 KiB

Open AccessProceeding Paper

Transparent Wearable Sensor for Early Extravasation Detection

by Hsuan-Chin Lu and Ying-Chih Liao

Proceedings 2020, 56(1), 8; https://doi.org/10.3390/proceedings2020056008 - 10 Dec 2020

Cited by 1 | Viewed by 1243

Abstract

In this work, we present a wearable sensor patch for the early detection of extravasation by using a simple, direct printing process. Interdigitated electrodes are printed on a flexible film, which can be attached to skin. The electrodes are integrated with a top [...] Read more.

In this work, we present a wearable sensor patch for the early detection of extravasation by using a simple, direct printing process. Interdigitated electrodes are printed on a flexible film, which can be attached to skin. The electrodes are integrated with a top electrode to form a flexible pressure-sensing device utilizing an electrical contact resistance (ECR) variation mechanism. The detector possesses good sensitivity and a low detection limit for pressure variation. By adjusting the printing parameters, sensors of millimeter size can be fabricated and allow the potential for multiple detection points in a large area. In addition, by using silver nanowire inks, the sensor becomes nearly transparent to prevent patients’ panic. The possibility and feasibility of this device for early extravasation detection is also evaluated. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 934 KiB

Open AccessProceeding Paper

Chemical Solution Deposition of Ba_xSr_1-xTiO₃ Thin Films for Energy Storage Applications

by Federica Benes, Mirela Dragomir, Barbara Malič and Marco Deluca

Proceedings 2020, 56(1), 9; https://doi.org/10.3390/proceedings2020056009 - 10 Dec 2020

Cited by 1 | Viewed by 1188

Abstract

Highly textured Ba₀_.₅Sr₀_.₅TiO₃and Ba₀_.₆Sr₀_.₄TiO₃thin films have been successfully processed using chemical solution deposition (CSD) techniques and annealed at different temperatures to investigate the [...] Read more.

Highly textured Ba₀_.₅Sr₀_.₅TiO₃and Ba₀_.₆Sr₀_.₄TiO₃thin films have been successfully processed using chemical solution deposition (CSD) techniques and annealed at different temperatures to investigate the influence on crystal growth. Microstructure and texture have been evaluated using SEM and XRD techniques. The films showed a homogeneous thickness of ~120 nm and the grain growth seemed to be highly influenced by the annealing temperature. Moreover, by tuning the deposition and annealing conditions, an almost epitaxial growth of Ba₀_.₆Sr₀_.₄TiO₃ on the platinized silicon substrate has been achieved. Nevertheless, the samples showed severe cracking due to the strain imposed by the substrate or due to the growing direction. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 951 KiB

Open AccessProceeding Paper

Light-Free Cross-Talk Analysis of a CMOS Infrared Detector Array

by Ying Dai, Syed Zeeshan Ali, Richard Hopper, Claudio Falco, Daniel Popa and Florin Udrea

Proceedings 2020, 56(1), 10; https://doi.org/10.3390/proceedings2020056010 - 10 Dec 2020

Viewed by 1147

Abstract

Low-cost infrared (IR) thermal cameras are powering a rising market of industrial and consumer applications. Complementary metal-oxide-semiconductor (CMOS)-based thermopile arrays are proven thermal imagers that can be monolithically integrated into low-cost and low-power-consumption formats for high-volume manufacturability. Here we present a simple method [...] Read more.

Low-cost infrared (IR) thermal cameras are powering a rising market of industrial and consumer applications. Complementary metal-oxide-semiconductor (CMOS)-based thermopile arrays are proven thermal imagers that can be monolithically integrated into low-cost and low-power-consumption formats for high-volume manufacturability. Here we present a simple method to evaluate the cross-talk of these arrays and propose a numerical model for device optimization. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 267 KiB

Open AccessProceeding Paper

Solidly Mounted Resonator (SMR) Sensors for Biomedical Applications

by Siavash Esfahani, Jan Peter Specht, George Jolly, Marina Cole and Julian W. Gardner

Proceedings 2020, 56(1), 11; https://doi.org/10.3390/proceedings2020056011 - 10 Dec 2020

Cited by 1 | Viewed by 1439

Abstract

Biosensors play a key role in medical diagnostics, and acoustic wave technology such as solidly mounted resonators (SMRs) applied to this field is one of the latest developments with great potential. This study seeks to explore the potential application of SMRs to detect [...] Read more.

Biosensors play a key role in medical diagnostics, and acoustic wave technology such as solidly mounted resonators (SMRs) applied to this field is one of the latest developments with great potential. This study seeks to explore the potential application of SMRs to detect and quantify prostate-specific antigen (PSA) for the screening and diagnosis of prostate cancer. The primary results show promising frequency shift of SMR sensors coated with Polydimethylsiloxane (PDMS) to different liquids. The SMR frequency is 1.082, 1.084 and 1.088 GHz, respectively, to air, deionized water and toluene (liquid) presence. These sensors have great potential as an accurate, low-cost method for measuring PSA and biomarkers for cancer and other diseases. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 398 KiB

Open AccessProceeding Paper

Phase-Modulated Standing Wave Interferometer

by Ingo Ortlepp, Eberhard Manske, Jens-Peter Zöllner and Ivo W. Rangelow

Proceedings 2020, 56(1), 12; https://doi.org/10.3390/proceedings2020056012 - 10 Dec 2020

Cited by 2 | Viewed by 1123

Abstract

Standing wave interferometers (SWIs) show enormous potential for miniaturization because of their simple linear optical set-up, consisting only of a laser source, a measuring mirror and two standing wave sensors for obtaining quadrature signals. To reduce optical influences on the standing wave and [...] Read more.

Standing wave interferometers (SWIs) show enormous potential for miniaturization because of their simple linear optical set-up, consisting only of a laser source, a measuring mirror and two standing wave sensors for obtaining quadrature signals. To reduce optical influences on the standing wave and avoid the need for an exact and long-term stable sensor-to-sensor distance, a single-sensor set-up was developed with a phase modulation by forced oscillation of the measuring mirror. When the correct modulation stroke is applied, the harmonics in the sensor signal can be used for obtaining quadrature signals for phase demodulation and direction discrimination. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 478 KiB

Open AccessProceeding Paper

Fabrication of Diamond Membranes by Femtosecond Laser Ablation for MEMS Sensor Applications

by Johann Zehetner, Alexander Kromka, Tibor Izsák, Gabriel Vanko, Lenka Gajdošová and Stephan Kasemann

Proceedings 2020, 56(1), 13; https://doi.org/10.3390/proceedings2020056013 - 10 Dec 2020

Viewed by 1252

Abstract

We present the feasibility in fabricating membranes and cantilevers made of diamond grown on Si/SiO₂ substrates by femtosecond laser ablation. In the ablation process, we generated nano- and microstructures on the membrane surface. Such laser-induced periodic surface structures (LIPSS) are useful in [...] Read more.

We present the feasibility in fabricating membranes and cantilevers made of diamond grown on Si/SiO₂ substrates by femtosecond laser ablation. In the ablation process, we generated nano- and microstructures on the membrane surface. Such laser-induced periodic surface structures (LIPSS) are useful in tailoring the surface chemistry. In combination with wet or reactive ion etching, smooth membranes were generated. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 546 KiB

Open AccessProceeding Paper

Bottom-Up Metal/Oxide/Bi₂Te₃ Heterostructures for Enhanced Thermoelectric Properties

by Zhenhua Wu and Zhiyu Hu

Proceedings 2020, 56(1), 14; https://doi.org/10.3390/proceedings2020056014 - 14 Dec 2020

Viewed by 1102

Abstract

In this paper, metals’ (Cu, Ag, Au)/Al₂O₃/Bi₂Te₃ heterostructures have been fabricated to synergistically optimize their carrier concentration and mobility, thereby enhancing their thermoelectric power factor. Metal can be alloyed with Bi₂Te₃ to reduce [...] Read more.

In this paper, metals’ (Cu, Ag, Au)/Al₂O₃/Bi₂Te₃ heterostructures have been fabricated to synergistically optimize their carrier concentration and mobility, thereby enhancing their thermoelectric power factor. Metal can be alloyed with Bi₂Te₃ to reduce the electron concentration. The introduction of the oxide layer further reduces the electron concentration and leads to an increase in mobility. By adjusting the metal and oxide layer, it is possible to realize the simultaneous optimization of electric conductivity and the Seebeck coefficient. This work will enable the optimal and novel design of heterstructures for thermoelectric materials with further improved performance. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 1156 KiB

Open AccessExtended Abstract

Fully Printed Flexible Chemiresistors with Tunable Selectivity Based on Gold Nanoparticle Composites

by Bendix Ketelsen, Patrick P. Tjarks, Ying-Chih Liao and Tobias Vossmeyer

Proceedings 2020, 56(1), 15; https://doi.org/10.3390/proceedings2020056015 - 14 Dec 2020

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Abstract

Functional composite nanomaterials are promising candidates for the fabrication of wearable, flexible chemiresistive sensors which can be used [...] Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 419 KiB

Open AccessProceeding Paper

Modelling of Evanescent Field Scattering

by Andreas Tortschanoff, Marcus Baumgart and Jaka Pribošek

Proceedings 2020, 56(1), 16; https://doi.org/10.3390/proceedings2020056016 - 14 Dec 2020

Cited by 1 | Viewed by 1193

Abstract

Evanescent field particle scattering is a promising method for single particle detection. In this study, we performed a detailed numerical analysis to show the possibilities and limitations of analytical models for predicting the capabilities of this sensing mechanism. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 569 KiB

Open AccessExtended Abstract

Towards Nanomaterials-Based Biocompatible and Biodegradable Strain Sensors for Healthcare and Medical Applications

by Shin-Da Wu, Bendix Ketelsen, Shan-hui Hsu and Tobias Vossmeyer

Proceedings 2020, 56(1), 17; https://doi.org/10.3390/proceedings2020056017 - 14 Dec 2020

Cited by 1 | Viewed by 1146

Abstract

Green electronics is an emerging environment-friendly process of the design and manufacture [...] Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 186 KiB

Open AccessProceeding Paper

Vacuum Packaging Requirements for MEMS and Characterization Techniques

by Luca Mauri, Anna Della Porta, Alessio Corazza and Marco Moraja

Proceedings 2020, 56(1), 18; https://doi.org/10.3390/proceedings2020056018 - 15 Dec 2020

Cited by 1 | Viewed by 1585

Abstract

Getter materials are technically proven and industrially well-implemented solutions for maintaining a vacuum inside electronic devices to assure long lifetimes and proper operating conditions. The pressure requirements of some hermetically packaged microelectromechanical systems (MEMS) devices, such as gyroscopes, accelerometers, infrared (IR) bolometers, and [...] Read more.

Getter materials are technically proven and industrially well-implemented solutions for maintaining a vacuum inside electronic devices to assure long lifetimes and proper operating conditions. The pressure requirements of some hermetically packaged microelectromechanical systems (MEMS) devices, such as gyroscopes, accelerometers, infrared (IR) bolometers, and digital mirrors, are very stringent. The internal pressure can be as low as in the 10⁻³ mbar range. Due to the desorption phenomena of gaseous species from the internal surfaces, the vacuum inside such hermetically sealed electronic devices tends to degrade over time and, in the worst case, can affect the proper operation of the device. The integration of a special nanostructured getter film is an effective way to preserve and guarantee the performance of such devices. In addition to the getter material, there is also the need to develop and customize analytical techniques for post-process vacuum quality control and reliability checks of hermetic bonding, which are extremely important for the assessment of a device’s overall performance, lifetime, and manufacturing process yield. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

3 pages, 404 KiB

Open AccessProceeding Paper

Design Considerations of Ultra-Low-Power Polymer Gas Microsensors Based on Noise Analysis

by Rafael Puyol, Sylvain Pétré, Yann Danlée, Thomas Walewyns, Laurent A. Francis and Denis Flandre

Proceedings 2020, 56(1), 19; https://doi.org/10.3390/proceedings2020056019 - 16 Dec 2020

Cited by 1 | Viewed by 1202

Abstract

Current sensing solutions must combine an ultra-low energy consumption trend with high reliability. The challenge lies on a fine setting of the detection threshold with the assurance of a sufficient sensitivity. In this article, the uncertainty introduced on gas sensing applications by the [...] Read more.

Current sensing solutions must combine an ultra-low energy consumption trend with high reliability. The challenge lies on a fine setting of the detection threshold with the assurance of a sufficient sensitivity. In this article, the uncertainty introduced on gas sensing applications by the inherent sensor noise is studied. A 1/f model of the electronic noise in polypyrrole-based ammonia (NH₃) sensors is presented and used to estimate the intrinsic signal-to-noise ratio (SNR), giving an effective precision of 10.7 bits, i.e., down to 31.4 ppb in terms of NH₃ concentration. No significant improvement in SNR is achieved by increasing the bias voltage and hence the power consumption. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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4 pages, 694 KiB

Open AccessProceeding Paper

Revisiting Colorimetric Gas Sensors: Compact, Versatile and Cost-Effective

by Christian Driau, Olga Casals, Ismael Benito-Altamirano, Joan Daniel Prades and Cristian Fàbrega

Proceedings 2020, 56(1), 20; https://doi.org/10.3390/proceedings2020056020 - 17 Dec 2020

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Abstract

We report on an inexpensive and very selective gas sensor implemented by simply combining colorimetric indicators casted on top of acetate-based transparent tape, with a commercial microchip adapted here to measure optical reflectance. This sensor can be easily reproduced (leading to quantitatively consistent [...] Read more.

We report on an inexpensive and very selective gas sensor implemented by simply combining colorimetric indicators casted on top of acetate-based transparent tape, with a commercial microchip adapted here to measure optical reflectance. This sensor can be easily reproduced (leading to quantitatively consistent results), refreshed and reconfigured to sense different target gases replacing only the colorimetric tape. The device may either work as sensor (CO₂ and NH₃) or dosimeter (Formaldehyde) depending on the targeted gas. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 205 KiB

Open AccessProceeding Paper

Surface Science of Metal Oxides: Examining What Happens at the Atomic Scale

by Ulrike Diebold

Proceedings 2020, 56(1), 22; https://doi.org/10.3390/proceedings2020056022 - 17 Dec 2020

Cited by 1 | Viewed by 1113

Abstract

The atomic-scale phenomena at surfaces and interfaces influence, and often even dominate, the properties of materials and their functioning in nanoscale devices. This contribution discusses recent results of applying the surface science method, where systems are investigated under idealized conditions. Such experiments directly [...] Read more.

The atomic-scale phenomena at surfaces and interfaces influence, and often even dominate, the properties of materials and their functioning in nanoscale devices. This contribution discusses recent results of applying the surface science method, where systems are investigated under idealized conditions. Such experiments directly relate to first-principles calculations and provide insights into mechanisms and processes at a level that cannot be achieved in any other way. The review discusses recent developments with a main emphasis on metal oxides, a versatile and extremely useful class of materials. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

2 pages, 384 KiB

Open AccessProceeding Paper

Photoconductivity of Colloidal Quantum Dot Films in Plasmonic Nanogaps

by Dario Grimaldi, Emil Kelderer, Andreas Hohenau, Harald Ditlbacher and Joachim R. Krenn

Proceedings 2020, 56(1), 23; https://doi.org/10.3390/proceedings2020056023 - 17 Dec 2020

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Abstract

We investigate the photoconductivity properties of lead sulphide (PbS) quantum dot ensembles in lithographically tailored gold electrodes with smallest gaps of 15 nm. We demonstrate that quantum dots are reliable nanoscale light/current converters and correlate the measured photocurrents to the quantum dot number, [...] Read more.

We investigate the photoconductivity properties of lead sulphide (PbS) quantum dot ensembles in lithographically tailored gold electrodes with smallest gaps of 15 nm. We demonstrate that quantum dots are reliable nanoscale light/current converters and correlate the measured photocurrents to the quantum dot number, the gap voltage and light irradiance. For the latter, we find a photocurrent power law dependence with an exponent of 2/3. Furthermore, we probe the role of plasmonic effects in the gold electrodes and image by scanning photocurrent microscopy the spatial dependence of photocurrent generation. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 316 KiB

Open AccessProceeding Paper

Ordered Porphyrin Arrays on Fe(001): An Enabling Technology for Future Spintronics

by Guglielmo Albani, Alberto Calloni, Madan S. Jagadeesh, Alberto Brambilla, Andrea Picone, Alessandro Lodesani, Lamberto Duò, Franco Ciccacci, Marco Finazzi and Gianlorenzo Bussetti

Proceedings 2020, 56(1), 25; https://doi.org/10.3390/proceedings2020056025 - 19 Dec 2020

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Abstract

We give evidence of the formation of an ordered array of tetra-phenyl porphyrins (TPP) when these molecules are deposited on top of oxygen-passivated Fe(001), namely the Fe(001)-p(1 × 1)O surface. We also prove that they are magnetically coupled with the substrate. [...] Read more.

We give evidence of the formation of an ordered array of tetra-phenyl porphyrins (TPP) when these molecules are deposited on top of oxygen-passivated Fe(001), namely the Fe(001)-p(1 × 1)O surface. We also prove that they are magnetically coupled with the substrate. The ordered molecular packing, together with the magnetic coupling, are fundamental conditions for application in organic spintronic devices. The system is studied by means of spin-resolved photoemission spectroscopies and scanning tunneling microscopy. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 603 KiB

Open AccessProceeding Paper

Optofluidic Particle Detection

by Vladislav Agluschewitsch, Mayra Garcés-Schröder and Andreas Waag

Proceedings 2020, 56(1), 26; https://doi.org/10.3390/proceedings2020056026 - 24 Dec 2020

Viewed by 1159

Abstract

The combination of optics and microfluidics for particle detection makes it possible to fabricate small low-cost devices. In such hybrid-on-chip systems with integrated µLEDs, the particles can be close to the light source, which is beneficial for the detection capability according to the [...] Read more.

The combination of optics and microfluidics for particle detection makes it possible to fabricate small low-cost devices. In such hybrid-on-chip systems with integrated µLEDs, the particles can be close to the light source, which is beneficial for the detection capability according to the simulation results. In addition, further advantages and extension possibilities of such devices are discussed. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 358 KiB

Open AccessProceeding Paper

VitaLight—Light to Support Vital Signs

by Stefan Schantl, Andreas Peter Weiss and Franz-Peter Wenzl

Proceedings 2020, 56(1), 27; https://doi.org/10.3390/proceedings2020056027 - 24 Dec 2020

Viewed by 1319

Abstract

The spectral composition of light has a significant influence on human wellbeing, emotion and health. Natural sunlight is often considered as the ideal light source in this regard. Therefore, artificial lighting solutions that mimic natural sunlight are a central research topic in the [...] Read more.

The spectral composition of light has a significant influence on human wellbeing, emotion and health. Natural sunlight is often considered as the ideal light source in this regard. Therefore, artificial lighting solutions that mimic natural sunlight are a central research topic in the lighting industry. Another global trend is the monitoring and evaluation of the vital parameters of human beings to improve their health status and their personal lifestyle. Here, we present VitaLight, a laboratory sample for a smart lighting system that aims to interconnect these global trends and consists of VitaWatch, a wristband with functionally integrated sensors that is comfortable to wear on the body, and VitaLUMI, a lighting unit with access to the internet. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 302 KiB

Open AccessProceeding Paper

Predicting Dielectric Properties of Doped BaTiO₃ Using First-Principles and Monte Carlo Simulations

by Florian Mayer, Maxim Popov, Jürgen Spitaler and Marco Deluca

Proceedings 2020, 56(1), 28; https://doi.org/10.3390/proceedings2020056028 - 25 Dec 2020

Viewed by 1088

Abstract

We investigate the dielectric properties of homovalent (M⁴⁺)-doped Ba(Ti_1−xM_x)O₃ compositions using a two-dimensional Ising-like network. The model is mainly based on the interaction of permanent and induced dipoles and allows us to simulate the collective behavior [...] Read more.

We investigate the dielectric properties of homovalent (M⁴⁺)-doped Ba(Ti_1−xM_x)O₃ compositions using a two-dimensional Ising-like network. The model is mainly based on the interaction of permanent and induced dipoles and allows us to simulate the collective behavior of atoms at finite temperatures. In contrast to previous publications, we also include first-principles calculations to model the local environment and interaction of the B-site atoms. Furthermore, in order to describe the corresponding physics more accurately, we introduce an additional degree of freedom for the polarization direction. Our simulations provide an insight into the formation of polar clusters, the evolution of spontaneous polarization at different concentrations of dopants, and the response to external fields. For the purpose of studying the dielectric properties, the model is used to calculate hysteresis curves and related quantities. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 1347 KiB

Open AccessProceeding Paper

Modelling of Void Collapse with Molecular Dynamics in Pure Sn

by Georg Siroky, Elke Kraker, Dietmar Kieslinger, Lorenz Romaner, Ernst Kozeschnik and Werner Ecker

Proceedings 2020, 56(1), 29; https://doi.org/10.3390/proceedings2020056029 - 26 Dec 2020

Viewed by 1395

Abstract

This work simulates the collapse of a spherical void in pure Sn during melting using molecular dynamics (MD). Simulations were performed for two temperatures with a modified embedded atom method (MEAM) potential, which was reported to be in good agreement with respect to [...] Read more.

This work simulates the collapse of a spherical void in pure Sn during melting using molecular dynamics (MD). Simulations were performed for two temperatures with a modified embedded atom method (MEAM) potential, which was reported to be in good agreement with respect to melting point and elastic constants. Solutions of the Rayleigh–Plesset (RP) equation are used for comparison under the assumption of macroscopic surface tension and liquid viscosity. Despite a qualitative correlation, longer collapse times were observed in MD simulations, which arose from partial solid structures and the incubation time for melting. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 177 KiB

Open AccessProceeding Paper

Aerosol Jet Printed Nanocarbons on Heat Sink Materials

by Reinhard Kaindl, Bernhard C. Bayer, Tushar Gupta, Songfeng Pei, Pengxiang Hou, Jinhong Du, Chang Liu, Wencai Ren, Alexander Blümel, Paul Patter, Karl Popovic, David Dergez and Wolfgang Waldhauser

Proceedings 2020, 56(1), 30; https://doi.org/10.3390/proceedings2020056030 - 28 Dec 2020

Viewed by 2144

Abstract

Graphene- and carbon nanotube (CNT)-based inks have been printed on relevant heat sink materials by Aerosol jet. The thickness of the layers varied between ~100 and ~1.500 nm. The inks’ viscosity ranged from <20 up to 600 cps at a solid content between [...] Read more.

Graphene- and carbon nanotube (CNT)-based inks have been printed on relevant heat sink materials by Aerosol jet. The thickness of the layers varied between ~100 and ~1.500 nm. The inks’ viscosity ranged from <20 up to 600 cps at a solid content between 0.18 and 3% and wide particle sizes from 5 nm up to 5 µm. The printed layers could be interesting for rather high-power and high-temperature applications including thermal heat spreaders, resistive heaters, high-current carrying interconnectors, temperature sensors and ordnance fuze technology. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

3 pages, 429 KiB

Open AccessExtended Abstract

Looking Inside Micro- and Nano-Mechanical Pillar Resonators: A Picosecond Ultrasonics Approach

by Paul Stritt, Juliane Doster, Thomas Dekorsy, Vitalyi Gusev, Eva Weig and Mike Hettich

Proceedings 2020, 56(1), 31; https://doi.org/10.3390/proceedings2020056031 - 28 Dec 2020

Viewed by 1518

Abstract

Pillar-shaped Gallium arsenide (GaAs) micromechanical resonators are fabricated, and the feasibility to measure the inside of the pillars in the axial direction with laser-induced GHz ultrasound based on picosecond ultrasonics is tested. Measurements on the pillars with head sizes in the µm range [...] Read more.

Pillar-shaped Gallium arsenide (GaAs) micromechanical resonators are fabricated, and the feasibility to measure the inside of the pillars in the axial direction with laser-induced GHz ultrasound based on picosecond ultrasonics is tested. Measurements on the pillars with head sizes in the µm range show excellent agreement with theoretical predictions. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 664 KiB

Open AccessProceeding Paper

In-Situ Spectroelectrochemical Study of Conductive Polyaniline Forms for Sensor Applications

by Anja Korent, Kristina Žagar Soderžnik and Kristina Žužek Rožman

Proceedings 2020, 56(1), 32; https://doi.org/10.3390/proceedings2020056032 - 29 Dec 2020

Cited by 3 | Viewed by 1460

Abstract

Our contribution focuses on a correlative study of polyaniline (PANI) electropolymerisation and UV/VIS spectroscopy. PANI was prepared via electro-oxidation using a potentiodynamic method on commercial gold screen-printed electrodes (Au-SPE). By using an in-situ spectroelectrochemical method, the development of the polymer was observed from [...] Read more.

Our contribution focuses on a correlative study of polyaniline (PANI) electropolymerisation and UV/VIS spectroscopy. PANI was prepared via electro-oxidation using a potentiodynamic method on commercial gold screen-printed electrodes (Au-SPE). By using an in-situ spectroelectrochemical method, the development of the polymer was observed from monomer, monomer oxidation to final polymer formation and its transformations between the oxidation forms. The results confirm the spontaneous doping of the polymer during the polymerisation, the instability of leucoemeraldine form in air and its two-stage oxidation to emeraldine form. The final conductive PANI deposited on Au-SPE will be used as sensor element for the detection of toxic organic compounds. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 187 KiB

Open AccessProceeding Paper

Endohedral Functionalization of Metallicity-Sorted Single-Walled Carbon Nanotubes

by Marianna V. Kharlamova, Christian Kramberger, Oleg Domanov, Andreas Mittelberger, Kazuhiro Yanagi, Thomas Pichler and Dominik Eder

Proceedings 2020, 56(1), 33; https://doi.org/10.3390/proceedings2020056033 - 30 Dec 2020

Cited by 4 | Viewed by 1221

Abstract

We performed endohedral functionalization of high-purity metallicity-sorted semiconducting and metallic single-walled carbon nanotubes (SWCNTs) with a mean diameter of 1.4 nm with silver chloride (AgCl) by the method of capillary filling with the melt. The AgCl-filled SWCNTs were investigated by high-resolution scanning transmission [...] Read more.

We performed endohedral functionalization of high-purity metallicity-sorted semiconducting and metallic single-walled carbon nanotubes (SWCNTs) with a mean diameter of 1.4 nm with silver chloride (AgCl) by the method of capillary filling with the melt. The AgCl-filled SWCNTs were investigated by high-resolution scanning transmission electron microscopy and spectroscopic techniques, such as Raman spectroscopy, X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy, which were combined to study comprehensively the modified electronic properties of the filled SWCNTs. The data revealed a downshift of the Fermi level of the nanotubes upon filling, i.e., a p-doping of SWCNTs. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

3 pages, 528 KiB

Open AccessProceeding Paper

Investigations on Long-Range AFM Scans Using a Nanofabrication Machine (NFM-100)

by Jaqueline Stauffenberg, Ingo Ortlepp, Christoph Reuter, Mathias Holz, Denis Dontsov, Christoph Schäffel, Steffen Strehle, Jens-Peter Zöllner, Ivo W. Rangelow and Eberhard Manske

Proceedings 2020, 56(1), 34; https://doi.org/10.3390/proceedings2020056034 - 30 Dec 2020

Cited by 1 | Viewed by 1320

Abstract

The focus of this work lies on investigations on a new Nano Fabrication Machine (NFM-100) with a mounted atomic force microscope (AFM). This installed tip-based measuring system uses self-sensing and self-actuated microcantilevers, which can be used especially for field-emission scanning probe lithography (FESPL). [...] Read more.

The focus of this work lies on investigations on a new Nano Fabrication Machine (NFM-100) with a mounted atomic force microscope (AFM). This installed tip-based measuring system uses self-sensing and self-actuated microcantilevers, which can be used especially for field-emission scanning probe lithography (FESPL). The NFM-100 has a positioning range of Ø 100 mm, which offers, in combination with the tip-based measuring system, the possibility to analyse structures over long ranges. Using different gratings, the accuracy and the reproducibility of the NFM-100 and the AFM-system will be shown. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 375 KiB

Open AccessProceeding Paper

Direct Deposition of CVD Diamond Layers on Top of GaN Membranes

by Tibor Izsák, Gabriel Vanko, Milan Držík, Stephan Kasemann, Johann Zehetner, Marian Vojs, Bohumír Zaťko, Štěpán Potocký and Alexander Kromka

Proceedings 2020, 56(1), 35; https://doi.org/10.3390/proceedings2020056035 - 30 Dec 2020

Cited by 1 | Viewed by 1202

Abstract

We present technological issues in the deposition of diamond films on gallium nitride (GaN) membranes. Many wrinkles and thicker diamond layers were observed at the membrane center and poor quality diamond outside the membrane area. The deflection of the membranes was analyzed by [...] Read more.

We present technological issues in the deposition of diamond films on gallium nitride (GaN) membranes. Many wrinkles and thicker diamond layers were observed at the membrane center and poor quality diamond outside the membrane area. The deflection of the membranes was analyzed by a bulging method using white light interferometry. The membrane bending is discussed in the terms of temperature gradient and mismatch of thermal expansion coefficients of materials. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 284 KiB

Open AccessProceeding Paper

Synthesis and Piezoelectric Characterization of UV-Curable Nanocellulose/ZnO/AlN Polymeric Flexible Films for Green Energy Generation Applications

by Maria Assunta Signore, Giulio Malucelli, Donatella Duraccio, Chiara De Pascali, Ambra Fioravanti, Pietro Siciliano and Luca Francioso

Proceedings 2020, 56(1), 36; https://doi.org/10.3390/proceedings2020056036 - 30 Dec 2020

Viewed by 1129

Abstract

In this work, the fabrication of composites consisting of piezoelectric ZnO ceramic nanostructures and nanocellulose fillers in a UV-cured acrylic matrix has been exploited for the design of new functional coatings for green energy generation. The piezoelectric behavior was investigated at different accelerations [...] Read more.

In this work, the fabrication of composites consisting of piezoelectric ZnO ceramic nanostructures and nanocellulose fillers in a UV-cured acrylic matrix has been exploited for the design of new functional coatings for green energy generation. The piezoelectric behavior was investigated at different accelerations applied to cantilever beams. The piezoelectric signal generated by the different ZnO nanostructures was improved by aluminum nitride film integration on the beam and proof mass insertion at the tip. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 377 KiB

Open AccessProceeding Paper

Temperature Cycled Operation and Multivariate Statistics for Electronic-Nose Applications Using Field Effect Transistors

by Guillem Domènech-Gil, Marius Rodner, Jens Eriksson and Donatella Puglisi

Proceedings 2020, 56(1), 37; https://doi.org/10.3390/proceedings2020056037 - 31 Dec 2020

Viewed by 1176

Abstract

Gas sensitive iridium-gated field effect transistors based on silicon carbide were used to study the response towards formaldehyde, ammonia, carbon monoxide and nitrogen dioxide at concentrations ranging from parts per million to parts per billion diluted in dry synthetic air and under 50% [...] Read more.

Gas sensitive iridium-gated field effect transistors based on silicon carbide were used to study the response towards formaldehyde, ammonia, carbon monoxide and nitrogen dioxide at concentrations ranging from parts per million to parts per billion diluted in dry synthetic air and under 50% of relative humidity. The sensor performance was studied using temperature cycled operation mode from 270 to 390 °C to investigate the capability of these devices to discriminate between the studied gases under different background conditions via pattern recognition algorithms. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 615 KiB

Open AccessProceeding Paper

Nanostructured Materials Based on Thin Films and Nanoclusters for Hydrogen Gas Sensing

by Stanislav Haviar, Nirmal Kumar, Šárka Batková and Jiří Čapek

Proceedings 2020, 56(1), 38; https://doi.org/10.3390/proceedings2020056038 - 5 Jan 2021

Cited by 2 | Viewed by 1179

Abstract

In this paper, we present two approaches to synthesize nanostructured metal oxide semiconductors in a form of multi-layer thin films later assembled as a conductometric gas-sensors. The first approach produces a combination of thin solid film of tungsten trioxide (WO₃) with [...] Read more.

In this paper, we present two approaches to synthesize nanostructured metal oxide semiconductors in a form of multi-layer thin films later assembled as a conductometric gas-sensors. The first approach produces a combination of thin solid film of tungsten trioxide (WO₃) with nanoclusters of cupric oxide (CuO) prepared by a magnetron-based gas aggregation cluster source (GAS). The second method is a two-step reactive magnetron sputtering forming a nanostructured copper tungstate (CuWO₄) on-top of a WO₃ film. Both methods lead to synthesis of nanosized hetero-junctions. These greatly improve the sensorial response to hydrogen in comparison with a WO₃ thin film alone. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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2 pages, 278 KiB

Open AccessProceeding Paper

Correlating Spatially Resolved Photoconductivity and Luminescence in Colloidal Quantum Dot Films

by Emil Kelderer, Dario Grimaldi, Andreas Hohenau, Harald Ditlbacher and Joachim R. Krenn

Proceedings 2020, 56(1), 39; https://doi.org/10.3390/proceedings2020056039 - 11 Jan 2021

Viewed by 1029

Abstract

We investigated the optoelectronic properties of lead sulphide (PbS) quantum dot films in lithographically tailored gold nanogap electrodes. In particular, we aimed at the correlated measurement of photoconductivity and luminescence as a tool to characterize the charge dynamics from exciton generation to carrier [...] Read more.

We investigated the optoelectronic properties of lead sulphide (PbS) quantum dot films in lithographically tailored gold nanogap electrodes. In particular, we aimed at the correlated measurement of photoconductivity and luminescence as a tool to characterize the charge dynamics from exciton generation to carrier extraction and recombination. Combining these measurements in an optical microscope with laser scanning excitation enabled, as well, the spatially resolved observation of the involved effects. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 541 KiB

Open AccessProceeding Paper

Real-Time Temperature Detection Via Quantum Dots for Photothermal Cellular Actuation

by Wei Yu, Olivier Deschaume, Stijn Jooken, Fanglei Guo, Pengfei Zhang, Jolan Wellens, Christ Glorieux and Carmen Bartic

Proceedings 2020, 56(1), 40; https://doi.org/10.3390/proceedings2020056040 - 20 Jan 2021

Viewed by 1387

Abstract

Plasmonic heating finds multiple applications in cell manipulation and stimulation, where heat generated by metal nanoparticles can be used to modify cell adhesion, control membrane currents, and suppress neuronal action potentials among others. Metal nanoparticles can also be easily integrated in artificial extracellular [...] Read more.

Plasmonic heating finds multiple applications in cell manipulation and stimulation, where heat generated by metal nanoparticles can be used to modify cell adhesion, control membrane currents, and suppress neuronal action potentials among others. Metal nanoparticles can also be easily integrated in artificial extracellular matrices to provide tunable, thermal cueing functionalities with nanometer spatial resolution. In this contribution, we present a platform enabling the combination of plasmonic heating with localized temperature sensing using quantum dots (QDs). Specifically, a functional nanocomposite material was designed with gold nanorods (AuNRs) and QDs incorporated in a cell-permissive hydrogel (e.g., collagen) as well as an optical set-up combining optical heating and temperature imaging, respectively. Specific area stimulation/readout can be realized through structured illumination using digital micromirror device (DMD) projection. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 362 KiB

Open AccessProceeding Paper

CO Detection Investigation at High Temperature by SiC MISFET Metal/Oxide Gas Sensors

by Lida Khajavizadeh, Anita Lloyd Spetz and Mike Andersson

Proceedings 2020, 56(1), 41; https://doi.org/10.3390/proceedings2020056041 - 21 Jan 2021

Viewed by 1314

Abstract

In order to investigate the necessary device improvements for high-temperature CO sensing with SiC metal insulator semiconductor field effect transistor (MISFET)-based chemical gas sensors, devices employing, as the gas-sensitive gate contact, a film of co-deposited Pt/Al₂O₃ instead of the commonly [...] Read more.

In order to investigate the necessary device improvements for high-temperature CO sensing with SiC metal insulator semiconductor field effect transistor (MISFET)-based chemical gas sensors, devices employing, as the gas-sensitive gate contact, a film of co-deposited Pt/Al₂O₃ instead of the commonly used catalytic metal-based contacts were fabricated and characterized for CO detection at elevated temperatures and different CO and O₂ levels. It can be concluded that the sensing mechanism at elevated temperatures correlates with oxygen removal from the sensor surface rather than the surface CO coverage as observed at lower temperatures. The long-term stability performance was also shown to be improved compared to that of previously studied devices. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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3 pages, 156 KiB

Open AccessProceeding Paper

Passive Visible Light Sensing of Retroreflective Foils on a Moving Object for Indoor Application

by Andreas Peter Weiss and Franz-Peter Wenzl

Proceedings 2020, 56(1), 42; https://doi.org/10.3390/proceedings2020056042 - 20 Jan 2021

Viewed by 1390

Abstract

We present a novel approach to perform passive visible light sensing of retroreflective foils mounted on a moving object by utilizing low-cost hardware combined with a self-developed, low complex software algorithm with minimal training effort for successful classification. Therewith, we show the feasibility [...] Read more.

We present a novel approach to perform passive visible light sensing of retroreflective foils mounted on a moving object by utilizing low-cost hardware combined with a self-developed, low complex software algorithm with minimal training effort for successful classification. Therewith, we show the feasibility of utilizing the visible light spectrum not only for illumination, but also to perform sensing tasks, which consequently will lead to less energy consumption, no need for active sensors on the moving object, and finally no necessity of wireless radio frequency communication between the object and the processing device. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

3 pages, 326 KiB

Open AccessProceeding Paper

Optimization of SnO₂-Based CMOS-Integrated Gas Sensors by Mono-, Bi- and Trimetallic Nanoparticles

by Robert Wimmer-Teubenbacher, Florentyna Sosada-Ludwikowska, Anton Köck, Stephan Steinhauer, Mukhles Sowwan and Vidyadhar Singh

Proceedings 2020, 56(1), 43; https://doi.org/10.3390/proceedings2020056043 - 20 Jan 2021

Cited by 1 | Viewed by 1800

Abstract

In this paper, we report on the optimization of SnO₂-based thin film gas sensor devices by mono-, bi- and trimetallic nanoparticles. Ag, AgRu, and AgRuPd nanoparticles are sputter deposited on CMOS-integrated SnO₂-thin film gas sensor devices. The CMOS device [...] Read more.

In this paper, we report on the optimization of SnO₂-based thin film gas sensor devices by mono-, bi- and trimetallic nanoparticles. Ag, AgRu, and AgRuPd nanoparticles are sputter deposited on CMOS-integrated SnO₂-thin film gas sensor devices. The CMOS device is a worldwide unique chip containing an array of eight microhotplates. The response towards the target gas CO was dramatically increased from 10% to more than 70% by using trimetallic AgRuPd nanoparticles. Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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8 pages, 1473 KiB

Open AccessProceeding Paper

Porphycene Films Grown on Highly Oriented Pyrolytic Graphite: Unveiling Structure–Property Relationship through Combined Reflectance Anisotropy Spectroscopy and Atomic Force Microscopy Investigations

by Marta Penconi, Lorenzo Ferraro, Jacek Waluk, Lamberto Duò, Franco Ciccacci, Alberto Bossi, Marcello Campione and Gianlorenzo Bussetti

Proceedings 2020, 56(1), 44; https://doi.org/10.3390/proceedings2020056044 - 3 Mar 2021

Cited by 1 | Viewed by 1496

Abstract

Thin organic films are widely used in sensors, solar cells, and optical devices due to their intense absorption in the visible/near-infrared (IR) region. Shifting, quenching, or reshaping of some spectral features can be achieved by chemical functionalization of the molecules, whereas an anisotropic [...] Read more.

Thin organic films are widely used in sensors, solar cells, and optical devices due to their intense absorption in the visible/near-infrared (IR) region. Shifting, quenching, or reshaping of some spectral features can be achieved by chemical functionalization of the molecules, whereas an anisotropic fingerprint due to preferential molecular alignment can be induced via a proper design and/or preparation of the substrate. Recently, we investigated the optical response of thin films of porphycene to acidification. With respect to the well-known and closely related tetraphenyl porphyrin, porphycene has the clear advantage of being optically active in the full visible range, and this makes visible by naked eye the immediate change of the film from brilliant blue-turquoise to green when exposed to HCl vapors. In this work, by exploiting a homemade reflectance anisotropy spectroscopy (RAS) apparatus, we explore possible optical anisotropies in the visible spectral range of porphycene films and relate them to the film morphology analyzed by atomic force microscopy (AFM). Full article

(This article belongs to the Proceedings of 4th International Conference nanoFIS 2020 - Functional Integrated nanoSystems)

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