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Low-Cost Chemosenors for Applications in Environment, Health, Food, and Industry Process Control

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A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Chemical Sensors".

Deadline for manuscript submissions: 15 September 2024 | Viewed by 2064

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Special Issue Editor

Dr. Weiying Lu

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Guest Editor

School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: sensors; food analysis; proteomics; nontargeted detection; chemometrics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Low-cost sensing refers to the use of affordable sensors to detect and measure the presence of chemicals. These sensors can be used in a wide variety of applications, including environmental monitoring, healthcare, food quality and safety, and industrial process control. Low-cost sensing technologies include, but are not limited to, the following: gas sensors in applications such as air quality monitoring, leak detection in industrial settings, or breath analysis in medical diagnostics; pH sensors used from water quality testing to food and beverage production; biosensors that use enzymes or antibodies to detect specific chemical compounds in medical diagnostics; colorimetric sensors that respond to a specific chemical reaction for integrated test kits; electronic noses with an array of chemical sensors to mimic the function of the human nose, identifying complex smells and tastes for food quality control or disease diagnosis.

Low-cost sensing can democratize access to important data and enable more widespread monitoring of chemical substances. However, like other low-cost sensing technologies, they may have limitations in terms of their accuracy, sensitivity, and selectivity compared to more expensive, laboratory-grade instruments. To overcome such disadvantages, recent developments in low-cost sensing have been driven by advances in materials science, nanotechnology, and information technologies, with key trends such as nanomaterials, printed electronics, paper-based sensors, wearable devices, the Internet of Things (IoT), Artificial Intelligence (AI), and Machine Learning (ML) making sensing more accessible, affordable, and effective, opening up new possibilities for monitoring and managing chemical substances in commercial products, the environment, and our bodies.

This Special Issue will encompass original research and reviews to benefit interested readers with knowledge of the state-of-the-art in low-cost sensing.

You may choose our Joint Special Issue in Chemosensors.

Dr. Weiying Lu
Guest Editor

Manuscript Submission Information

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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. Sensors is an international peer-reviewed open access semimonthly 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

low-cost
chemosensors
sensors
food analysis
gas sensor
pH sensor
medical diagnostics
colorimetric sensors
electronic nose
healthcare
environmental monitoring

Published Papers (4 papers)

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Research

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15 pages, 3098 KiB

Open AccessArticle

A Non-Disposable Electrochemical Sensor Based on Laser-Synthesized Pd/LIG Nanocomposite-Modified Screen-Printed Electrodes for the Detection of H₂O₂

by Ruijie Song, Jianwei Zhang, Ge Yang, Yu Wu, Jun Yu and Huichao Zhu

Sensors 2024, 24(7), 2043; https://doi.org/10.3390/s24072043 - 22 Mar 2024

Viewed by 502

Abstract

There have been many studies on the significant correlation between the hydrogen peroxide content of different tissues or cells in the human body and the risk of disease, so the preparation of biosensors for detecting hydrogen peroxide concentration has been a hot topic for researchers. In this paper, palladium nanoparticles (PdNPs) and laser-induced graphene (LIG) were prepared by liquid-phase pulsed laser ablation and laser-induced technology, respectively. The complexes were prepared by stirring and used for the modification of screen-printed electrodes to develop a non-enzymatic hydrogen peroxide biosensor that is low cost and mass preparable. The PdNPs prepared with anhydrous ethanol as a solvent have a uniform particle size distribution. The LIG prepared by laser direct writing has good electrical conductivity, and its loose porous structure provides more adsorption sites. The electrochemical properties of the modified electrode were characterized by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. Compared with bare screen-printed electrodes, the modified electrodes are more sensitive for the detection of hydrogen peroxide. The sensor has a linear response range of 5 µM–0.9 mM and 0.9 mM–5 mM. The limit of detection is 0.37 µM. The above conclusions indicate that the hydrogen peroxide electrochemical biosensor prepared in this paper has great advantages and potential in electrochemical catalysis. Full article

(This article belongs to the Special Issue Low-Cost Chemosenors for Applications in Environment, Health, Food, and Industry Process Control)

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12 pages, 3300 KiB

Open AccessArticle

Room Temperature NH₃ Selective Gas Sensors Based on Double-Shell Hierarchical SnO₂@polyaniline Composites

by Yuan Qu, Haotian Zheng, Yuhua Lei, Ziwen Ding, Siqi Li, Song Liu and Wei Ji

Sensors 2024, 24(6), 1824; https://doi.org/10.3390/s24061824 - 12 Mar 2024

Viewed by 542

Abstract

Morphology and structure play a crucial role in influencing the performance of gas sensors. Hollow structures, in particular, not only increase the specific surface area of the material but also enhance the collision frequency of gases within the shell, and have been studied in depth in the field of gas sensing. Taking SnO₂ as an illustrative example, a dual-shell structure SnO₂ (D-SnO₂) was prepared. D-SnO₂@Polyaniline (PANI) (DSPx, x represents D-SnO₂ molar content) composites were synthesized via the in situ oxidative polymerization method, and simultaneously deposited onto a polyethylene terephthalate (PET) substrate to fabricate an electrode-free, flexible sensor. The impact of the SnO₂ content on the sensing performance of the DSPx-based sensor for NH₃ detection at room temperature was discussed. The results showed that the response of a 20 mol% D-SnO₂@PANI (DSP20) sensor to 100 ppm NH₃ at room temperature is 37.92, which is 5.1 times higher than that of a pristine PANI sensor. Moreover, the DSP20 sensor demonstrated a rapid response and recovery rate at the concentration of 10 ppm NH₃, with response and recovery times of 182 s and 86 s. Full article

(This article belongs to the Special Issue Low-Cost Chemosenors for Applications in Environment, Health, Food, and Industry Process Control)

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13 pages, 3558 KiB

Open AccessArticle

Synergistically Enhanced Electrochemical Sensing of Food Adulterant in Milk Sample at Erbium Vanadate/Graphitic Carbon Nitride Composite

by U. G. Anushka Sanjeewani and Sea-Fue Wang

Sensors 2024, 24(6), 1808; https://doi.org/10.3390/s24061808 - 11 Mar 2024

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Abstract

Dimetridazole (DMZ), a nitroimidazole derivative, is a notable antibiotic that has garnered growing interest in the medical community owing to its noteworthy pharmacological and toxicological properties. Increasing interest is being directed toward developing high-performance sensors for continuous monitoring of DMZ in food samples. This research investigated an electrochemical sensor-based nano-sized ErVO₄ attached to a sheet-like g-CN-coated glassy carbon electrode to determine dimetridazole (DMZ). The chemical structure and morphological characterization of synthesized ErVO₄@g-CN were analyzed with XRD, FTIR, TEM, and EDS. Irregular shapes of ErVO₄ nanoparticles are approximately 15 nm. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were followed to examine the electrochemical performance in pH 7 phosphate buffer solution for higher performance. This electrochemical sensor showed a low detection limit (LOD) of 1 nM over a wide linear range of 0.5 to 863.5 µM. Also, selectivity, stability, repeatability, and reproducibility studies were investigated. Furthermore, this electrochemical sensor was applied to real-time milk sample analysis for the detection of analytes. Full article

(This article belongs to the Special Issue Low-Cost Chemosenors for Applications in Environment, Health, Food, and Industry Process Control)

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Review

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18 pages, 4995 KiB

Open AccessReview

Enhancing Sensitivity in Gas Detection: Porous Structures in Organic Field-Effect Transistor-Based Sensors

by Soohwan Lim, Ky Van Nguyen and Wi Hyoung Lee

Sensors 2024, 24(9), 2862; https://doi.org/10.3390/s24092862 - 30 Apr 2024

Viewed by 255

Abstract

Gas detection is crucial for detecting environmentally harmful gases. Organic field-effect transistor (OFET)-based gas sensors have attracted attention due to their promising performance and potential for integration into flexible and wearable devices. This review examines the operating mechanisms of OFET-based gas sensors and explores methods for improving sensitivity, with a focus on porous structures. Researchers have achieved significant enhancements in sensor performance by controlling the thickness and free volume of the organic semiconductor layer. Additionally, innovative fabrication techniques like self-assembly and etching have been used to create porous structures, facilitating the diffusion of target gas molecules, and improving sensor response and recovery. These advancements in porous structure fabrication suggest a promising future for OFET-based gas sensors, offering increased sensitivity and selectivity across various applications. Full article

(This article belongs to the Special Issue Low-Cost Chemosenors for Applications in Environment, Health, Food, and Industry Process Control)

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