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Nanomaterials for Sensors
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Nanomaterials for Sensors

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

Deadline for manuscript submissions: closed (31 March 2021) | Viewed by 12981

Special Issue Editor

Dr. Paolo Bertoncello

E-Mail Website
Guest Editor
Systems and Process Engineering Centre, College of Engineering, Swansea University, Bay Campus, Crymlyn Burrows, Swansea SA1 8EN, UK
Interests: electrochemiluminescence; sensors; thin films; electrochemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanomaterials have attracted considerable attention in many technological fields, one of them the electroanalytical field in which tailored nanostructured materials deposited on electrode surfaces enhance sensitivity and confer proper selectivity. This has led to the development of chemically modified electrodes, sensors, and biosensors for the detection of a variety of analytes of interest in medical diagnostics, environmental monitoring, etc.. This Special Issue aims at collecting reviews and recent papers on the latest developments of nanomaterials (metal nanoparticles, polymers and polymer composites, carbon nanomaterials, and enzymes) and their use in electroanalytical applications.

Dr. Paolo Bertoncello
Guest Editor

Manuscript Submission Information

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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

  • chemically modified electrodes 
  • enzymes, biosensors
  • voltammetric sensors
  • carbon nanomaterials
  • polymers

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Published Papers (3 papers)

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Research

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20 pages, 6309 KiB  
Article
Voltammetry at Hexamethyl-P-Terphenyl Poly(Benzimidazolium) (HMT-PMBI)-Coated Glassy Carbon Electrodes: Charge Transport Properties and Detection of Uric and Ascorbic Acid
by Matthew Rees, Andrew G. Wright, Steven Holdcroft and Paolo Bertoncello
Sensors 2020, 20(2), 443; https://doi.org/10.3390/s20020443 - 13 Jan 2020
Cited by 10 | Viewed by 4132
Abstract
We describe the voltammetric behavior of an anion-exchange membrane, hexamethyl-p-terphenyl poly(benzimidazolium) (HMT-PMBI). The anion-exchange properties of HMT-PMBI chemically modified electrodes were investigated using K4Fe(CN)6 and K2IrCl6 as redox probes. The permselectivity properties of HMT-PMBI chemically modified electrodes [...] Read more.
We describe the voltammetric behavior of an anion-exchange membrane, hexamethyl-p-terphenyl poly(benzimidazolium) (HMT-PMBI). The anion-exchange properties of HMT-PMBI chemically modified electrodes were investigated using K4Fe(CN)6 and K2IrCl6 as redox probes. The permselectivity properties of HMT-PMBI chemically modified electrodes were ascertained using tris(2-2’)bipyridyl-ruthenium(II) chloride Ru(bpy)32+. Cyclic voltammetry and chronoamperometry were utilized to extract parameters such as the concentration of the redox mediators inside the films and the apparent diffusion coefficients. We found the concentration of K4Fe(CN)6 and K2IrCl6 redox species within HMT-PMBI-coated films to be on the order of 0.04–0.1 mol·dm−3, and values of Dapp ca. 10−10–10−9 cm2·s−1. To evaluate the possibility of using such a polymer coating in electroanalysis, HMT-PMBI-modified electrodes were utilized for the voltammetric detection of uric acid in artificial urine, Surine® and ascorbic acid in Vitamin C samples. The results showed that HMT-PMBI-coated electrodes can detect uric acid in Surine® with a limit of detection (LoD) of 7.7 µM, sensitivity of 0.14 µA·µM−1·cm−2, and linear range between 5 μM and 200 μM, whereas for Vitamin C tablets, the LoD is 41.4 µM, the sensitivity is 0.08 µA·µM−1·cm−2, and the linear range is between 25 μM and 450 μM. Full article
(This article belongs to the Special Issue Nanomaterials for Sensors)
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13 pages, 3516 KiB  
Article
Novel Enzyme-Free Multifunctional Bentonite/Polypyrrole/Silver Nanocomposite Sensor for Hydrogen Peroxide Detection over a Wide pH Range
by Khouloud Jlassi, Mostafa H. Sliem, Kamel Eid, Igor Krupa, Mohamed M. Chehimi and Aboubakr M. Abdullah
Sensors 2019, 19(20), 4442; https://doi.org/10.3390/s19204442 - 14 Oct 2019
Cited by 11 | Viewed by 3398
Abstract
Precise designs of low-cost and efficient catalysts for the detection of hydrogen peroxide (H2O2) over wide ranges of pH are important in various environmental applications. Herein, a versatile and ecofriendly approach is presented for the rational design of ternary [...] Read more.
Precise designs of low-cost and efficient catalysts for the detection of hydrogen peroxide (H2O2) over wide ranges of pH are important in various environmental applications. Herein, a versatile and ecofriendly approach is presented for the rational design of ternary bentonite-silylpropyl-polypyrrole/silver nanoarchitectures (denoted as BP-PS-PPy/Ag) via the in-situ photo polymerization of pyrrole with salinized bentonite (BP-PS) in the presence of silver nitrate. The Pyrrolyl-functionalized silane (PS) is used as a coupling agent for tailoring the formation of highly exfoliated BP-PS-PPy sheet-like nanostructures ornamented with monodispersed Ag nanoparticles (NPs). Taking advantage of the combination between the unique physicochemical properties of BP-PS-PPy and the outstanding catalytic merits of Ag nanoparticles (NPs), the as-synthesized BP-PS-PPy/Ag shows a superior electrocatalytic reduction and high-detection activity towards H2O2 under different pH conditions (from 3 to 10). Intriguingly, the UV-light irradiation significantly enhances the electroreduction activity of H2O2 substantially, compared with the dark conditions, due to the high photoelectric response properties of Ag NPs. Moreover, BP-PS-PPy/Ag achived a quick current response with a detection limit at 1 μM within only 1 s. Our present approach is green, facile, scalable and renewable. Full article
(This article belongs to the Special Issue Nanomaterials for Sensors)
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Review

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18 pages, 4160 KiB  
Review
Recent Progress of Toxic Gas Sensors Based on 3D Graphene Frameworks
by Qichao Dong, Min Xiao, Zengyong Chu, Guochen Li and Ye Zhang
Sensors 2021, 21(10), 3386; https://doi.org/10.3390/s21103386 - 13 May 2021
Cited by 25 | Viewed by 4654
Abstract
Air pollution is becoming an increasingly important global issue. Toxic gases such as ammonia, nitrogen dioxide, and volatile organic compounds (VOCs) like phenol are very common air pollutants. To date, various sensing methods have been proposed to detect these toxic gases. Researchers are [...] Read more.
Air pollution is becoming an increasingly important global issue. Toxic gases such as ammonia, nitrogen dioxide, and volatile organic compounds (VOCs) like phenol are very common air pollutants. To date, various sensing methods have been proposed to detect these toxic gases. Researchers are trying their best to build sensors with the lowest detection limit, the highest sensitivity, and the best selectivity. As a 2D material, graphene is very sensitive to many gases and so can be used for gas sensors. Recent studies have shown that graphene with a 3D structure can increase the gas sensitivity of the sensors. The limit of detection (LOD) of the sensors can be upgraded from ppm level to several ppb level. In this review, the recent progress of the gas sensors based on 3D graphene frameworks in the detection of harmful gases is summarized and discussed. Full article
(This article belongs to the Special Issue Nanomaterials for Sensors)
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