Exploration and Application of Micro-Devices/Sensors in Analytical Chemistry

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "B:Biology and Biomedicine".

Deadline for manuscript submissions: 30 May 2024 | Viewed by 4425

Special Issue Editors


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Guest Editor
1. LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-213 Porto, Portugal
2. Department of Analytical Chemistry, Faculty of Chemistry, Universidad de Sevilla, C/Prof. García González, s/n, 41012 Seville, Spain
Interests: sample preparation; liquid-phase microextraction (LPME); electromembrane extraction (EME); biomembranes; green analytical chemistry; emerging pollutants; drugs; environment

E-Mail Website
Guest Editor
Department of Analytical Chemistry, Faculty of Chemistry, Universidad de Sevilla, c/Prof. García González, s/n., 41012-Seville, Spain
Interests: analytical chemistry; drugs; sample preparation; nanoparticles; liquid chromatography; food chemistry

E-Mail Website
Guest Editor
Department of Analytical Chemistry, Faculty of Chemistry, Universidad de Sevilla, c/Prof. García González, s/n., 41012-Seville, Spain
Interests: analytical chemistry; environment; emerging pollutants; extraction techniques; liquid chromatography

Special Issue Information

Dear Colleagues,

This Special Issue is dedicated to covering the latest advances in the application of micro-devices/sensors in analytical chemistry. Particular attention is given to the exploration and application using portable devices, such as smart materials or microfluidic devices, etc.

Both original research articles and reviews are welcome. Topics may include (but are not limited to) the following: sensors or biosensors, on-site separation and analysis of drugs, drug monitoring and detection, smart materials for sensing, and microfluidic and portable devices.

We look forward to receiving your contributions.

Dr. Román-Hidalgo Cristina
Prof. Dr. María Jesús Martín-Valero
Prof. Dr. Mercedes Villar-Navarro
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

  • sensors
  • biosensors
  • sensing
  • on-site analysis
  • drug monitoring
  • drug detection
  • separation
  • nanomaterials
  • smart materials
  • microfluidic devices
  • portable devices

Published Papers (3 papers)

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Research

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12 pages, 4076 KiB  
Article
Nitrate Sensor with a Wide Detection Range and High Stability Based on a Cu-Modified Boron-Doped Diamond Electrode
by Shengnan Wei, Danlin Xiao, Yang Li and Chao Bian
Micromachines 2024, 15(4), 487; https://doi.org/10.3390/mi15040487 - 1 Apr 2024
Viewed by 800
Abstract
This paper describes an electrochemical sensor based on a Cu-modified boron-doped diamond (BDD) electrode for the detection of nitrate-contaminated water. The sensor utilizes the catalytic effect of copper on nitrate and the stability of the BDD electrode. By optimizing the electrolyte system, the [...] Read more.
This paper describes an electrochemical sensor based on a Cu-modified boron-doped diamond (BDD) electrode for the detection of nitrate-contaminated water. The sensor utilizes the catalytic effect of copper on nitrate and the stability of the BDD electrode. By optimizing the electrolyte system, the linear detection range was expanded, allowing the sensor to detect highly concentrated nitrate samples up to 100 mg/L with a low detection limit of 0.065 mg/L. Additionally, the stability of the sensor was improved. The relative standard deviation of the current responses during 25 consecutive tests was only 1.03%. The wide detection range and high stability of the sensor makes it suitable for field applications and the on-site monitoring of nitrate-contaminated waters. Full article
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12 pages, 3669 KiB  
Article
Development and Characterization of Nano-Ink from Silicon Carbide/Multi-Walled Carbon Nanotubes/Synthesized Silver Nanoparticles for Non-Enzymatic Paraoxon Residuals Detection
by Itsarapong Chuasontia, Wichaya Sirisom, Natthapon Nakpathomkun, Surachet Toommee, Chiravoot Pechyen, Benchamaporn Tangnorawich and Yardnapar Parcharoen
Micromachines 2023, 14(8), 1613; https://doi.org/10.3390/mi14081613 - 16 Aug 2023
Cited by 1 | Viewed by 1748
Abstract
The ongoing advancement in the synthesis of new nanomaterials has accelerated the rapid development of non-enzymatic pesticide sensors based on electrochemical platforms. This study aims to develop and characterize Nano-ink for applying organophosphorus pesticides using paraoxon residue detection. Multi-walled carbon nanotubes, silicon carbide, [...] Read more.
The ongoing advancement in the synthesis of new nanomaterials has accelerated the rapid development of non-enzymatic pesticide sensors based on electrochemical platforms. This study aims to develop and characterize Nano-ink for applying organophosphorus pesticides using paraoxon residue detection. Multi-walled carbon nanotubes, silicon carbide, and silver nanoparticles were used to create Nano-ink using a green synthesis process in 1:1:0, 1:1:0.5, and 1:1:1 ratios, respectively. These composites were combined with chitosan of varying molecular weights, which served as a stabilizing glue to keep the Nano-ink employed in a functioning electrode stable. By using X-ray powder diffraction, Raman spectroscopy, energy dispersive X-ray spectroscopy, and a field emission scanning electron microscope, researchers were able to examine the crystallinity, element composition, and surface morphology of Nano-ink. The performance of the proposed imprinted working electrode Nano-ink was investigated using cyclic voltammetry and differential pulse voltammetry techniques. The Cyclic voltammogram of Ag NPs/chitosan (medium, 50 mg) illustrated high current responses and favorable conditions of the Nano-ink modified electrode. Under the optimized conditions, the reduction currents of paraoxon using the DPV techniques demonstrated a linear reaction ranging between 0.001 and 1.0 µg/mL (R2 = 0.9959) with a limit of detection of 0.0038 µg/mL and a limit of quantitation of 0.011 µg/mL. It was concluded that the fabricated Nano-ink showed good electrochemical activity for non-enzymatic paraoxon sensing. Full article
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Review

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21 pages, 856 KiB  
Review
Sensors in the Detection of Abused Substances in Forensic Contexts: A Comprehensive Review
by Luana M. Rosendo, Mónica Antunes, Ana Y. Simão, Ana Teresa Brinca, Gonçalo Catarro, Rodrigo Pelixo, João Martinho, Bruno Pires, Sofia Soares, José Francisco Cascalheira, Luís Passarinha, Tiago Rosado, Mário Barroso and Eugenia Gallardo
Micromachines 2023, 14(12), 2249; https://doi.org/10.3390/mi14122249 - 17 Dec 2023
Cited by 1 | Viewed by 1434
Abstract
Forensic toxicology plays a pivotal role in elucidating the presence of drugs of abuse in both biological and solid samples, thereby aiding criminal investigations and public health initiatives. This review article explores the significance of sensor technologies in this field, focusing on diverse [...] Read more.
Forensic toxicology plays a pivotal role in elucidating the presence of drugs of abuse in both biological and solid samples, thereby aiding criminal investigations and public health initiatives. This review article explores the significance of sensor technologies in this field, focusing on diverse applications and their impact on the determination of drug abuse markers. This manuscript intends to review the transformative role of portable sensor technologies in detecting drugs of abuse in various samples. They offer precise, efficient, and real-time detection capabilities in both biological samples and solid substances. These sensors have become indispensable tools, with particular applications in various scenarios, including traffic stops, crime scenes, and workplace drug testing. The integration of portable sensor technologies in forensic toxicology is a remarkable advancement in the field. It has not only improved the speed and accuracy of drug abuse detection but has also extended the reach of forensic toxicology, making it more accessible and versatile. These advancements continue to shape forensic toxicology, ensuring swift, precise, and reliable results in criminal investigations and public health endeavours. Full article
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