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Nanomaterials
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Nanomaterials for Sensing Application
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Nanomaterials for Sensing Application

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanoelectronics, Nanosensors and Devices".

Deadline for manuscript submissions: closed (5 December 2022) | Viewed by 3033

Special Issue Editor

Prof. Dr. Qin Xu

E-Mail Website
Guest Editor
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
Interests: point-of-care testing; electrochemical analysis; wearable and flexible
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Functional semiconductors with attractive electronic and photoelectronic properties show great promise in various fields. In recent decades, tremendous research efforts have been devoted to the design of photoactive and electroactive semiconductors or its composite for qualitative and quantitative analysis applications. This Special Issue is interested in the preparation, surface modification, and functionalization of semiconductors and their related composites for the sensing of healthy, environmental, and bio-related areas.

The major technological progress in the last few decades has resulted in the elaboration of numerous novel instrumental analytical methods allowing for the detection of molecules at very low concentrations. It requires the development of advanced materials that can serve as components of detectors. Various new materials have found application as parts of elements of detectors aiming to enhance the transduction of signals. Semiconductors with unique optical and electrochemical properties are advantageous for the development of novel chemical sensors and biosensors.

The Special Issue aims to showcase the most recent advances in the applications of semiconductors with a focus on their application, including but not limited to sensors, labeling, imaging, and therapeutic applications in biomedicine.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) sensors for environment pollution, sensors for ions, sensors for organic compounds, sensors for biomolecules, and sensors of biological interest. Optical, electrochemical, and photoelectrochemical sensors based on different types of semiconductors are welcomed.

We look forward to receiving your contributions.

Prof. Dr. Qin Xu
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. Nanomaterials 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 2900 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

  • semiconductor
  • optoelectronic
  • electroanalytical
  • optical sensor
  • electrochemical sensor

Published Papers (2 papers)

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Research

12 pages, 2216 KiB  
Article
High-Throughput Color Imaging Hg2+ Sensing via Amalgamation-Mediated Shape Transition of Concave Cube Au Nanoparticles
by He Zhu, Weizhen Xu, Min Shan, Tao Yang, Qinlu Lin, Kexue Yu, Yanxia Xing and Yang Yu
Nanomaterials 2022, 12(11), 1902; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12111902 - 02 Jun 2022
Viewed by 1502
Abstract
Mercury, as one type of toxic heavy metal, represents a great threat to environmental and biological metabolic systems. Thus, reliable and sensitive quantitative detection of mercury levels is particularly meaningful for environmental protection and human health. We proposed a high-throughput single-particle color imaging [...] Read more.
Mercury, as one type of toxic heavy metal, represents a great threat to environmental and biological metabolic systems. Thus, reliable and sensitive quantitative detection of mercury levels is particularly meaningful for environmental protection and human health. We proposed a high-throughput single-particle color imaging strategy under dark-field microscopy (DFM) for mercury ions (Hg2+) detection by using individual concave cube Au nanoparticles as optical probes. In the presence of ascorbic acid (AA), Hg2+ was reduced to Hg which forms Au–Hg amalgamate with Au nanoparticles, altering their localized surface plasmon resonance (LSPR). Transmission electron microscopy (TEM) images demonstrated that the concave cube Au nanoparticles were approaching to sphere upon increasing the concentration of Hg2+. The nanoparticles underwent an obvious color change from red to yellow, green, and finally blue under DFM due to the shape-evolution and LSPR changes. In addition, we demonstrated for the first time that the LSPR of Au–Hg amalgamated below 400 nm. Inspired by the above-mentioned results, single-particle color variations were digitalized by converting the color image into RGB channels to obtain (green+blue)/red intensity ratios [(G+B)/R]. The concentration-dependence change was quantified by statistically analyzing the (G+B)/R ratios of a large number of particles. A linear range from 10 to 2000 nM (R2 = 0.972) and a limit of detection (LOD) of 1.857 nM were acquired. Furthermore, many other metal ions, like Cu2+, Cr3+, etc., did not interfere with Hg2+ detection. More importantly, Hg2+ content in industrial wastewater samples and in the inner regions of human HepG2 cells was determined, showing great potential for developing a single-particle color imaging sensor in complex biological samples using concave cube Au nanoparticles as optical probes. Full article
(This article belongs to the Special Issue Nanomaterials for Sensing Application)
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13 pages, 2076 KiB  
Article
Fungus-Based MnO/Porous Carbon Nanohybrid as Efficient Laccase Mimic for Oxygen Reduction Catalysis and Hydroquinone Detection
by Haoran Ge and Hailong Zhang
Nanomaterials 2022, 12(9), 1596; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12091596 - 08 May 2022
Cited by 6 | Viewed by 1911
Abstract
Developing efficient laccase-mimicking nanozymes via a facile and sustainable strategy is intriguing in environmental sensing and fuel cells. In our work, a MnO/porous carbon (MnO/PC) nanohybrid based on fungus was synthesized via a facile carbonization route. The nanohybrid was found to possess excellent [...] Read more.
Developing efficient laccase-mimicking nanozymes via a facile and sustainable strategy is intriguing in environmental sensing and fuel cells. In our work, a MnO/porous carbon (MnO/PC) nanohybrid based on fungus was synthesized via a facile carbonization route. The nanohybrid was found to possess excellent laccase-mimicking activity using 2,2′-azinobis (3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt (ABTS) as the substrate. Compared with the natural laccase and reported nanozymes, the MnO/PC nanozyme had much lower Km value. Furthermore, the electrochemical results show that the MnO/PC nanozyme had high electrocatalytic activity toward the oxygen reduction reaction (ORR) when it was modified on the electrode. The hybrid nanozyme could catalyze the four-electron ORR, similar to natural laccase. Moreover, hydroquinone (HQ) induced the reduction of oxABTS and caused the green color to fade, which provided colorimetric detection of HQ. A desirable linear relationship (0–50 μM) and detection limit (0.5 μM) were obtained. Our work opens a simple and sustainable avenue to develop a carbon–metal hybrid nanozyme in environment and energy applications. Full article
(This article belongs to the Special Issue Nanomaterials for Sensing Application)
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