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Chemosensors
Special Issues
Anisotropic Nanomaterials for Sensing Applications
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Anisotropic Nanomaterials for Sensing Applications

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Applied Chemical Sensors".

Deadline for manuscript submissions: closed (30 July 2022) | Viewed by 13421

Special Issue Editor

Dr. Kandammathe V. Sreekanth

E-Mail Website
Guest Editor
Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, Singapore 637371, Singapore
Interests: optical sensors; nanobiosensors; plasmonics; phase change materials

Special Issue Information

Anisotropic nanomaterials enjoy unique functionalities derived from their nanoscale morphology, that make them extremely attractive for devising new applications. This is a class of nanomaterials with direction-dependent physical and chemical properties. Several one-, two-, and three-dimensional anisotropic nanomaterials have been developed using different material constitutes, such as metals, polymers, dielectrics, carbon, semiconductors, and oxides. 

An important application of anisotropic nanomaterials is sensing. Accordingly, anisotropic nanomaterials promise the detection of lower biomolecular concentrations, which is a necessary step for early cancer screening and detection. For these reasons, various engineered anisotropic nanomaterials, such as 1D nanofibers, nanorods, 2D nanoribbon, nanofilms, nanoporous materials, anisotropic metasurfaces and hyperbolic metamaterials, have been widely used to improve the performance of sensing, in particular chemo- and bio-sensors. Novel interrogation and sensing schemes are necessary to utilize the morphological advantages of anisotropic nanomaterials.             

This Special Issue focusses on the latest developments in anisotropic nanomaterials and their applications in sensing, including chemo- and bio-sensors. This issue also covers novel design principles and sensing methods based on deep learning and artificial intelligence.

Dr. Kandammathe V. Sreekanth
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Chemosensors is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Anisotropic nanomaterials preparation and properties
  • Anisotropic metasurfaces and hyperbolic metamaterials
  • Anisotropic nanomaterials based chemo- and bio-sensors
  • Optical and plasmonic sensors
  • Anisotropic noble metal nanoparticles for biosensing
  • Label-based and label-free optical sensors
  • Novel sensing methods and design principles
  • Modelling and simulations

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Published Papers (4 papers)

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Research

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12 pages, 2811 KiB  
Article
Tungsten-Based Cost-Effective Gas Sensors for H2S Detection
by Didier Fasquelle, Nathalie Verbrugghe and Stéphanie Députier
Chemosensors 2021, 9(11), 295; https://doi.org/10.3390/chemosensors9110295 - 20 Oct 2021
Cited by 3 | Viewed by 1910
Abstract
Tungsten trioxide thin films were deposited on silicon substrates by non-reactive RF sputtering from a WO3 target at room temperature. The WO3 films were post-annealed at two different temperatures, 400 °C and 500 °C. The morphological and microstructural properties of these [...] Read more.
Tungsten trioxide thin films were deposited on silicon substrates by non-reactive RF sputtering from a WO3 target at room temperature. The WO3 films were post-annealed at two different temperatures, 400 °C and 500 °C. The morphological and microstructural properties of these films were analyzed by using atomic force microscopy and X-ray diffraction. X-ray diffraction patterns only show WO3 oxide phases. The AFM images show different morphologies with smaller grains for the film annealed at 400 °C. WO3 sensing films and W heating elements were embedded in commercial cases for the fabrication of cost-effective gas sensors. The sensitivity and dynamic response of the sensors were analyzed under various concentrations of H2S, from 20 to 100 ppm, at SIMTRONICS SAS (3M Company, Saint Paul, MN, USA). A good sensitivity G/G0 of about 6.6 under H2S 100 ppm was obtained with the best sensor. An interesting dynamic response was observed in particular with a short response time. Additionally, the evolution of the sensitivity was studied, and a conduction model was proposed for explaining the conduction mechanism under H2S exposition. Full article
(This article belongs to the Special Issue Anisotropic Nanomaterials for Sensing Applications)
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20 pages, 3814 KiB  
Article
Chemiresistors Based on Li-Doped CuO–TiO2 Films
by Alfio Torrisi, Jiří Vacík, Giovanni Ceccio, Antonino Cannavò, Vasily Lavrentiev, Pavel Horák, Roman Yatskiv, Jan Vaniš, Jan Grym, Ladislav Fišer, Martin Hruška, Přemysl Fitl, Jaroslav Otta and Martin Vrňata
Chemosensors 2021, 9(9), 246; https://doi.org/10.3390/chemosensors9090246 - 2 Sep 2021
Cited by 5 | Viewed by 3054
Abstract
Chemiresistors based on thin films of the Li-doped CuO–TiO2 heterojunctions were synthesized by a 2-step method: (i) repeated ion beam sputtering of the building elements (on the Si substrates and multisensor platforms); and (ii) thermal annealing in flowing air. The structure and [...] Read more.
Chemiresistors based on thin films of the Li-doped CuO–TiO2 heterojunctions were synthesized by a 2-step method: (i) repeated ion beam sputtering of the building elements (on the Si substrates and multisensor platforms); and (ii) thermal annealing in flowing air. The structure and composition of the films were analyzed by several methods: Rutherford Backscattering (RBS), Neutron Depth Profiling (NDP), Secondary Ion Mass Spectrometry (SIMS), and Atomic Force Microscopy (AFM), and their sensitivity to gaseous analytes was evaluated using a specific lab-made device operating in a continuous gas flow mode. The obtained results showed that the Li doping significantly increased the sensitivity of the sensors to oxidizing gases, such as NO2, O3, and Cl2, but not to reducing H2. The sensing response of the CuO–TiO2–Li chemiresistors improved with increasing Li content. For the best sensors with about 15% Li atoms, the detection limits were as follows: NO2 → 0.5 ppm, O3 → 10 ppb, and Cl2 → 0.1 ppm. The Li-doped sensors showed excellent sensing performance at a lower operating temperature (200 °C); however, even though their response time was only a few minutes, their recovery was slow (up to a few hours) and incomplete. Full article
(This article belongs to the Special Issue Anisotropic Nanomaterials for Sensing Applications)
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Review

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17 pages, 3912 KiB  
Review
Recent Advances in Vertically Aligned Nanocomposites with Tunable Optical Anisotropy: Fundamentals and Beyond
by Xuejing Wang and Haiyan Wang
Chemosensors 2021, 9(6), 145; https://doi.org/10.3390/chemosensors9060145 - 16 Jun 2021
Cited by 4 | Viewed by 3075
Abstract
Developing reliable and tunable metamaterials is fundamental to next-generation optical-based nanodevices and computing schemes. In this review, an overview of recent progress made with a unique group of ceramic-based functional nanocomposites, i.e., vertically aligned nanocomposites (VANs), is presented, with the focus on the [...] Read more.
Developing reliable and tunable metamaterials is fundamental to next-generation optical-based nanodevices and computing schemes. In this review, an overview of recent progress made with a unique group of ceramic-based functional nanocomposites, i.e., vertically aligned nanocomposites (VANs), is presented, with the focus on the tunable anisotropic optical properties. Using a self-assembling bottom-up deposition method, the as-grown VANs present great promise in terms of structural flexibility and property tunability. Such broad tunability of functionalities is achieved through VAN designs, material selection, growth control, and strain coupling. The as-grown multi-phase VAN films also present enormous advantages, including wafer scale integration, epitaxial quality, sharp atomic interface, as well as designable materials and geometries. This review also covers the research directions with practical device potentials, such as multiplex sensing, high-temperature plasmonics, magneto-optical switching, as well as photonic circuits. Full article
(This article belongs to the Special Issue Anisotropic Nanomaterials for Sensing Applications)
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37 pages, 2426 KiB  
Review
Advances in Electrochemical Aptasensors Based on Carbon Nanomaterials
by Gennady Evtugyn, Anna Porfireva, Rezeda Shamagsumova and Tibor Hianik
Chemosensors 2020, 8(4), 96; https://doi.org/10.3390/chemosensors8040096 - 8 Oct 2020
Cited by 35 | Viewed by 4619
Abstract
Carbon nanomaterials offer unique opportunities for the assembling of electrochemical aptasensors due to their high electroconductivity, redox activity, compatibility with biochemical receptors and broad possibilities of functionalization and combination with other auxiliary reagents. In this review, the progress in the development of electrochemical [...] Read more.
Carbon nanomaterials offer unique opportunities for the assembling of electrochemical aptasensors due to their high electroconductivity, redox activity, compatibility with biochemical receptors and broad possibilities of functionalization and combination with other auxiliary reagents. In this review, the progress in the development of electrochemical aptasensors based on carbon nanomaterials in 2016–2020 is considered with particular emphasis on the role of carbon materials in aptamer immobilization and signal generation. The synthesis and properties of carbon nanotubes, graphene materials, carbon nitride, carbon black particles and fullerene are described and their implementation in the electrochemical biosensors are summarized. Examples of electrochemical aptasensors are classified in accordance with the content of the surface layer and signal measurement mode. In conclusion, the drawbacks and future prospects of carbon nanomaterials’ application in electrochemical aptasensors are briefly discussed. Full article
(This article belongs to the Special Issue Anisotropic Nanomaterials for Sensing Applications)
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