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Micromachines
Special Issues
Thin-Film Devices for Healthcare and Environmental Sensing
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Thin-Film Devices for Healthcare and Environmental Sensing

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

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 6591

Special Issue Editor

Dr. Francesca Leonardi

E-Mail Website
Guest Editor
Stichting imec Nederland within OnePlanet Research Center, Bronland 10, 6708 WH Wageningen, The Netherlands
Interests: electrochemical sensors and biosensors; thin-films; field-effect transistors; surface engineering; membranes

Special Issue Information

Dear Colleagues,

The Special Issue “Thin-Film Devices for Healthcare and Environmental Sensing” seeks to highlight recent advances in thin-film technologies for sensing purposes. The topic promises to gather the attention of a multidisciplinary audience by collecting contributions in research that work towards this goal. Transducers based on thin-film technologies promise to be extremely reliable and low in cost, but the control of the properties at their interfaces is essential for operating them in a selective and sensitive manner. Furthermore, the development of thin-film-based sensors for long-term monitoring is an exciting but challenging perspective that can find many applications in the healthcare domain, where the environment may be harsh and difficult to access. Thin films can be fabricated from a wide range of materials, including polymers, metal oxides, semiconductors, carbon-based materials, and nanocomposites, whose properties can be tuned according to the type of transduction mechanism. For example, sensors based on the combination of thin-film technologies with electrochemical and electrical transduction have demonstrated tremendous improvement in terms of limits of detection and stability. This Special Issue aims to collect research papers, short communications, and review articles related to the development of novel thin-film strategies for sensing purposes, thin-film electrochemical sensors, thin-film electrical sensors (i.e., field-effect transistor sensors), and recent developments in sensing technologies for long-term monitoring.

We look forward to receiving your submissions.

Dr. Francesca Leonardi
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. 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

  • sensors
  • thin film
  • smart coatings
  • thin-film transistors
  • electrochemical sensors
  • real-time monitoring

Published Papers (3 papers)

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Research

16 pages, 7963 KiB  
Article
Field-Effect Transistors Based on Single-Layer Graphene and Graphene-Derived Materials
by Octavian-Gabriel Simionescu, Andrei Avram, Bianca Adiaconiţă, Petruţa Preda, Cătălin Pârvulescu, Florin Năstase, Eugen Chiriac and Marioara Avram
Micromachines 2023, 14(6), 1096; https://doi.org/10.3390/mi14061096 - 23 May 2023
Cited by 2 | Viewed by 1335
Abstract
The progress of advanced materials has invoked great interest in promising novel biosensing applications. Field-effect transistors (FETs) are excellent options for biosensing devices due to the variability of the utilized materials and the self-amplifying role of electrical signals. The focus on nanoelectronics and [...] Read more.
The progress of advanced materials has invoked great interest in promising novel biosensing applications. Field-effect transistors (FETs) are excellent options for biosensing devices due to the variability of the utilized materials and the self-amplifying role of electrical signals. The focus on nanoelectronics and high-performance biosensors has also generated an increasing demand for easy fabrication methods, as well as for economical and revolutionary materials. One of the innovative materials used in biosensing applications is graphene, on account of its remarkable properties, such as high thermal and electrical conductivity, potent mechanical properties, and high surface area to immobilize the receptors in biosensors. Besides graphene, other competing graphene-derived materials (GDMs) have emerged in this field, with comparable properties and improved cost-efficiency and ease of fabrication. In this paper, a comparative experimental study is presented for the first time, for FETs having a channel fabricated from three different graphenic materials: single-layer graphene (SLG), graphene/graphite nanowalls (GNW), and bulk nanocrystalline graphite (bulk-NCG). The devices are investigated by scanning electron microscopy (SEM), Raman spectroscopy, and I-V measurements. An increased electrical conductance is observed for the bulk-NCG-based FET, despite its higher defect density, the channel displaying a transconductance of up to ≊4.9×10−3 A V−1, and a charge carrier mobility of ≊2.86×10−4 cm2 V−1 s−1, at a source-drain potential of 3 V. An improvement in sensitivity due to Au nanoparticle functionalization is also acknowledged, with an increase of the ON/OFF current ratio of over four times, from ≊178.95 to ≊746.43, for the bulk-NCG FETs. Full article
(This article belongs to the Special Issue Thin-Film Devices for Healthcare and Environmental Sensing)
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14 pages, 6023 KiB  
Article
Fabrication of a New Electrochemical Sensor Based on Bimetal Oxide for the Detection of Furazolidone in Biological Samples
by Ruspika Sundaresan, Vinitha Mariyappan, Shen-Ming Chen, Saranvignesh Alagarsamy and Muthumariappan Akilarasan
Micromachines 2022, 13(6), 876; https://doi.org/10.3390/mi13060876 - 31 May 2022
Cited by 3 | Viewed by 1944
Abstract
This study utilized a simple hydrothermal method to synthesize nickel molybdenum oxide (NMO) for the detection of furazolidone (FZE). Our synthesized NMO was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron [...] Read more.
This study utilized a simple hydrothermal method to synthesize nickel molybdenum oxide (NMO) for the detection of furazolidone (FZE). Our synthesized NMO was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron spectroscopy (FE-SEM), and energy dispersive X-ray spectroscopy (EDX). The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to detect the FZE. Under optimized conditions, the obtained results showed that the NMO had an excellent electrocatalytic property towards FZE. As a result, NMO/GCE showed a good linear range of 0.001–1765 µM, an excellent detection limit (LOD) of 0.02 µM, and sensitivity of 0.2042 µA µM−1 cm−2. Full article
(This article belongs to the Special Issue Thin-Film Devices for Healthcare and Environmental Sensing)
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8 pages, 1291 KiB  
Article
Amperometric Monitoring of Dissolution of pH-Responsive EUDRAGIT® Polymer Film Coatings
by Júlia Mestres, Francesca Leonardi and Klaus Mathwig
Micromachines 2022, 13(3), 362; https://doi.org/10.3390/mi13030362 - 25 Feb 2022
Cited by 2 | Viewed by 2344
Abstract
Electrochemical sensors are powerful tools for the detection and real-time monitoring of a wide variety of analytes. However, the long-term operation of Faradaic sensors in complex media is challenging due to fouling. The protection of the electrode surface during in vivo operation is [...] Read more.
Electrochemical sensors are powerful tools for the detection and real-time monitoring of a wide variety of analytes. However, the long-term operation of Faradaic sensors in complex media is challenging due to fouling. The protection of the electrode surface during in vivo operation is a key element for improving the monitoring of analytes. Here, we study different EUDRAGIT® controlled release acrylate copolymers for protecting electrode surfaces. The dissolution of these polymers—namely EUDRAGIT® L 30 D-55 and EUDRAGIT® FS 30 D—is triggered by a change in pH of the environment, and it is electrochemically monitored by detecting electrode access by means of a redox probe. The full dissolution of the polymer is achieved within 30 min and the electrode response indicates a complete recovery of the original electrochemical performance. We demonstrate that amperometric sensing is a practical and straightforward technique for real-time and in situ sensing of EUDRAGIT® dissolution profiles. It will find future applications in determining the protection of polymer electrode coating in real matrices and in vivo applications. Full article
(This article belongs to the Special Issue Thin-Film Devices for Healthcare and Environmental Sensing)
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