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Micromachines
Special Issues
Microstructured Sensors: From Design to Application
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Microstructured Sensors: From Design to Application

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (10 October 2024) | Viewed by 8067

Special Issue Editors

Dr. Mingliang Li

E-Mail Website
Guest Editor
Department of Chemistry, The University of Hong Kong, Hong Kong 999077, China
Interests: organic field effect transistor; chemical sensor; photovoltaic device; self-assembled monolayer
Dr. Ziwei Li

E-Mail Website
Guest Editor
Hunan Institute of Optoelectronic Integration, College of Materials Science and Engineering, Hunan University, Changsha 410082, China
Interests: low-dimensional material; optical material; optoelectronic device; surface plasmon

Special Issue Information

Dear Colleagues,

With the development and upgrading of information technology and the health industry, functional sensors have become increasingly vital for ensuring individuals’ quality of life and health. Sensors such as optical, chemical, and biological sensors play a crucial role in this regard, demanding new advancements in sensor design and production. Microstructured sensors have emerged as a key solution, as they offer enhanced sensitivity, stability, specificity, and even service life, which make them of great significance in fields such as biomedical engineering, environmental monitoring, and industrial process control.

We are delighted to announce this Special Issue of Micromachines, entitled “Microstructured Sensors: from Design to Application”. This Special Issue aims to provide a platform for researchers and industry professionals to showcase their latest research and developments in the realm of functional sensors with tailored microstructures. The scope of this Special Issue encompasses diverse topics, including, but not limited to, the design, fabrication, characterization, and application of microstructured sensors. We warmly encourage the submission of original research articles, reviews, and communications that address the latest advances and challenges in this traditional but vigorous field. We look forward to receiving your contributions and hope that this Special Issue will serve as a valuable resource for researchers, engineers, and industry professionals alike.

Best regards,

Dr. Mingliang Li
Dr. Ziwei Li
Guest Editors

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. Micromachines 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 2600 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

  • microstructures
  • new materials biosensors
  • chemical sensors
  • self-assembled monolayer
  • optical sensors

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Published Papers (6 papers)

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Editorial

Jump to: Research

2 pages, 142 KiB  
Editorial
Microstructured Sensors: The Nexus of Innovation and Functionality
by Mingliang Li
Micromachines 2024, 15(12), 1523; https://doi.org/10.3390/mi15121523 (registering DOI) - 21 Dec 2024
Abstract
In an era of rapid technological evolution, the demand for functional sensors that can keep up with the pace is more pressing than ever [...] Full article
(This article belongs to the Special Issue Microstructured Sensors: From Design to Application)

Research

Jump to: Editorial

13 pages, 5789 KiB  
Article
The Influence of Microstructure on TCR for Inkjet-Printed Resistive Temperature Detectors Fabricated Using AgNO3/Ethylene-Glycol-Based Inks
by Aziz Radwan, Yongkun Sui and Christian Zorman
Micromachines 2024, 15(6), 749; https://doi.org/10.3390/mi15060749 - 2 Jun 2024
Viewed by 1001
Abstract
This study investigated the influence of microstructure on the performance of Ag inkjet-printed, resistive temperature detectors (RTDs) fabricated using particle-free inks based on a silver nitrate (AgNO3) precursor and ethylene glycol as the ink solvent. Specifically, the temperature coefficient of resistance [...] Read more.
This study investigated the influence of microstructure on the performance of Ag inkjet-printed, resistive temperature detectors (RTDs) fabricated using particle-free inks based on a silver nitrate (AgNO3) precursor and ethylene glycol as the ink solvent. Specifically, the temperature coefficient of resistance (TCR) and sensitivity for sensors printed using inks that use monoethylene glycol (mono-EG), diethylene glycol (di-EG), and triethylene glycol (tri-EG) and subjected to a low-pressure argon (Ar) plasma after printing were investigated. Scanning electron microscopy (SEM) confirmed previous findings that microstructure is strongly influenced by the ink solvent, with mono-EG inks producing dense structures, while di- and tri-EG inks produce porous structures, with tri-EG inks yielding the most porous structures. RTD testing revealed that sensors printed using mono-EG ink exhibited the highest TCR (1.7 × 10−3/°C), followed by di-EG ink (8.2 × 10−4/°C) and tri-EG ink (7.2 × 10−4/°C). These findings indicate that porosity exhibits a strong negative influence on TCR. Sensitivity was not strongly influenced by microstructure but rather by the resistance of RTD. The highest sensitivity (0.84 Ω/°C) was observed for an RTD printed using mono-EG ink but not under plasma exposure conditions that yield the highest TCR. Full article
(This article belongs to the Special Issue Microstructured Sensors: From Design to Application)
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13 pages, 4546 KiB  
Article
Flexible Three-Dimensional Force Tactile Sensor Based on Velostat Piezoresistive Films
by Yuanxiang Zhang, Jiantao Zeng, Yong Wang and Guoquan Jiang
Micromachines 2024, 15(4), 486; https://doi.org/10.3390/mi15040486 - 31 Mar 2024
Cited by 2 | Viewed by 2364
Abstract
The development of a high-performance, low-cost, and simply fabricated flexible three-dimensional (3D) force sensor is essential for the future development of electronic skins suitable for the detection of normal and shear forces for several human motions. In this study, a sandwich-structured flexible 3D [...] Read more.
The development of a high-performance, low-cost, and simply fabricated flexible three-dimensional (3D) force sensor is essential for the future development of electronic skins suitable for the detection of normal and shear forces for several human motions. In this study, a sandwich-structured flexible 3D force tactile sensor based on a polyethylene-carbon composite material (velostat) is presented. The sensor has a large measuring range, namely, 0–12 N in the direction of the normal force and 0–2.6 N in the direction of the shear force. For normal forces, the sensitivity is 0.775 N−1 at 0–1 N, 0.107 N−1 between 1 and 3 N, and 0.003 N−1 at 3 N and above. For shear forces, the measured sensitivity is 0.122 and 0.12 N−1 in x- and y-directions, respectively. Additionally, the sensor exhibits good repeatability and stability after 2500 cycles of loading and releasing. The response and recovery times of the sensor are as fast as 40 and 80 ms, respectively. Furthermore, we prepared a glove-like sensor array. When grasping the object using the tactile glove, the information about the force applied to the sensing unit can be transmitted through a wireless system in real-time and displayed on a personal computer (PC). The prepared flexible 3D force sensor shows broad application prospects in the field of smart wearable devices. Full article
(This article belongs to the Special Issue Microstructured Sensors: From Design to Application)
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16 pages, 2898 KiB  
Article
An Improved Seeker Optimization Algorithm for Phase Sensitivity Enhancement of a Franckeite- and WS2-Based SPR Biosensor for Waterborne Bacteria Detection
by Chong Yue, Xiuting Zhao, Lei Tao, Chuntao Zheng, Yueqing Ding and Yongcai Guo
Micromachines 2024, 15(3), 362; https://doi.org/10.3390/mi15030362 - 3 Mar 2024
Viewed by 1351
Abstract
For the purpose of detecting waterborne bacteria, a high-phase-sensitivity SPR sensor with an Ag–TiO2–Franckeite–WS2 hybrid structure is designed using an improved seeker optimization algorithm (ISOA). By optimizing each layer of sensor construction simultaneously, the ISOA guarantees a minimum reflectance of [...] Read more.
For the purpose of detecting waterborne bacteria, a high-phase-sensitivity SPR sensor with an Ag–TiO2–Franckeite–WS2 hybrid structure is designed using an improved seeker optimization algorithm (ISOA). By optimizing each layer of sensor construction simultaneously, the ISOA guarantees a minimum reflectance of less than 0.01 by Ag (20.36 nm)–TiO2 (6.08 nm)–Franckeite (monolayer)–WS2 (bilayer) after 30 iterations for E. coli. And the optimal phase sensitivity is 2.378 × 106 deg/RIU. Sensor performance and computing efficiency have been greatly enhanced using the ISOA in comparison to the traditional layer-by-layer technique and the SOA method. This will enable sensors to detect a wider range of bacteria with more efficacy. As a result, the ISOA-based design idea could provide SPR biosensors with new applications in environmental monitoring. Full article
(This article belongs to the Special Issue Microstructured Sensors: From Design to Application)
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9 pages, 2935 KiB  
Article
An All-Dielectric Metamaterial Terahertz Biosensor for Cytokine Detection
by Kuo Men, Ziwei Lian, Hailing Tu, Hongbin Zhao, Qianhui Wei, Qingxi Jin, Changhui Mao and Feng Wei
Micromachines 2024, 15(1), 53; https://doi.org/10.3390/mi15010053 - 26 Dec 2023
Cited by 1 | Viewed by 1310
Abstract
In this paper, we report an all-dielectric metamaterial terahertz biosensor, which exhibits a high Q factor of 35 at an 0.82 resonance peak. A structure with an electromagnetically induced transparency effect was designed and fabricated to perform a Mie resonance for the terahertz [...] Read more.
In this paper, we report an all-dielectric metamaterial terahertz biosensor, which exhibits a high Q factor of 35 at an 0.82 resonance peak. A structure with an electromagnetically induced transparency effect was designed and fabricated to perform a Mie resonance for the terahertz response. The biosensor exhibits a limit of detection of 100 pg/mL for cytokine interleukin 2 (IL-2) and a linear response for the logarithm of the concentration of IL-2 in the range of 100 pg/mL to 1 μg/mL. This study implicates an important potential for the detection of cytokines in serum and has potential application in the clinical detection of cytokine release syndrome. Full article
(This article belongs to the Special Issue Microstructured Sensors: From Design to Application)
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10 pages, 2359 KiB  
Article
Sensitive Detection of Trace Explosives by a Self-Assembled Monolayer Sensor
by Weitao Liu, Wajid Ali, Ye Liu, Mingliang Li and Ziwei Li
Micromachines 2023, 14(12), 2179; https://doi.org/10.3390/mi14122179 - 29 Nov 2023
Cited by 1 | Viewed by 1315
Abstract
Fluorescence probe technology holds great promise in the application of trace explosive detection due to its high sensitivity, fast response speed, good selectivity, and low cost. In this work, a designed approach has been employed to prepare the TPE-PA-8 molecule, utilizing the classic [...] Read more.
Fluorescence probe technology holds great promise in the application of trace explosive detection due to its high sensitivity, fast response speed, good selectivity, and low cost. In this work, a designed approach has been employed to prepare the TPE-PA-8 molecule, utilizing the classic aggregation-induced emission (AIE) property of 1,1,2,2-tetraphenylethene (TPE), for the development of self-assembled monolayers (SAMs) targeting the detection of trace nitroaromatic compound (NAC) explosives. The phosphoric acid acts as an anchoring unit, connecting to TPE through an alkyl chain of eight molecules, which has been found to play a crucial role in promoting the aggregation of TPE luminogens, leading to the enhanced light-emission property and sensing performance of SAMs. The SAMs assembled on Al2O3-deposited fiber film exhibit remarkable detection performances, with detection limits of 0.68 ppm, 1.68 ppm, and 2.5 ppm for trinitrotoluene, dinitrotoluene, and nitrobenzene, respectively. This work provides a candidate for the design and fabrication of flexible sensors possessing the high-performance and user-friendly detection of trace NACs. Full article
(This article belongs to the Special Issue Microstructured Sensors: From Design to Application)
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