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Micromachines
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Advanced Functional Nanostructures for Chemical Sensing
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Advanced Functional Nanostructures for Chemical Sensing

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E：Engineering and Technology".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 4664

Special Issue Editor

Dr. Padmanathan Karthick Kannan

E-Mail Website
Guest Editor
Department of Chemistry, Sungkyunkwan University, Suwon 440746, Republic of Korea
Interests: chemi-resistive gas sensors; impedimetric chemical sensors; electrochemical sensors; lithography patterned electrodes; surface-enhanced Raman spectroscopy

Special Issue Information

Dear Colleagues,

It is with great pleasure that I invite you to publish your original research findings in this Special Issue entitled “Advanced Functional Nanostructures for Chemical Sensing”.

The continuous release of greenhouse gases, along with the emission of pollutants and toxic gases from industrial sectors, create severe health-related issues for mankind. Along with this, the use of pesticides and fertilizers contaminates water bodies and agricultural crops, which also causes adverse effects on the ecosystem. Hence, it is of the utmost importance to detect/sense the chemicals present in the atmosphere and in the environment. In this respect, chemical sensors find immense interest as they are very helpful in providing information about the presence and concentration of chemicals. The use of nanostructured materials in chemical sensing has shown promise because of their enhanced sensing ability with excellent selectivity and very low detection limit. This has led to the development of novel, interesting, advanced functional nanomaterials with tunable physicochemical properties and high surface-to-volume ratio for the fabrication of chemical sensors. This Special Issue aims to focus on the recent advancements in the synthesis of advanced functional nanostructures and their application in chemical sensing. Accordingly, this Special Issue plans to showcase original research papers, perspectives, and review articles in areas including, but not limited to, the following.

Dr. Padmanathan Karthick Kannan
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

  • metal-oxide-based chemical sensors
  • core–shell nanostructures for chemical sensing
  • carbonaceous materials based chemical sensors
  • chemical sensors based on 2d nanomaterials
  • advanced nanocomposites
  • chemical sensors based on transition metal chalcogenides
  • conducting-polymer-based sensors
  • graphene and graphene oxide for sensing
  • metal-organic framework-based sensors

Published Papers (3 papers)

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Research

16 pages, 5317 KiB  
Article
Gas-Sensitive Properties of ZnO/Ti2CTx Nanocomposites
by Elizaveta P. Simonenko, Ilya A. Nagornov, Artem S. Mokrushin, Aleksey A. Averin, Yulia M. Gorban, Tatiana L. Simonenko, Nikolay P. Simonenko and Nikolay T. Kuznetsov
Micromachines 2023, 14(4), 725; https://doi.org/10.3390/mi14040725 - 24 Mar 2023
Cited by 5 | Viewed by 1279
Abstract
At present, a new class of 2D nanomaterials, MXenes, is of great scientific and applied interest, and their application prospects are very broad, including as effective doping components for receptor materials of MOS sensors. In this work we have studied the influence on [...] Read more.
At present, a new class of 2D nanomaterials, MXenes, is of great scientific and applied interest, and their application prospects are very broad, including as effective doping components for receptor materials of MOS sensors. In this work we have studied the influence on the gas-sensitive properties of nanocrystalline zinc oxide synthesized by atmospheric pressure solvothermal synthesis, with the addition of 1–5% of multilayer two-dimensional titanium carbide Ti2CTx, obtained by etching Ti2AlC with NaF solution in hydrochloric acid. It was found that all the obtained materials have high sensitivity and selectivity with respect to 4–20 ppm NO2 at a detection temperature of 200 °C. It is shown that the selectivity towards this compound is best for the sample containing the highest amount of Ti2CTx dopant. It has been found that as the MXene content increases, there is an increase in nitrogen dioxide (4 ppm) from 1.6 (ZnO) to 20.5 (ZnO-5 mol% Ti2CTx). reactions which the responses to nitrogen dioxide increase. This may be due to the increase in the specific surface area of the receptor layers, the presence of MXene surface functional groups, as well as the formation of the Schottky barrier at the interface between the phases of the components. Full article
(This article belongs to the Special Issue Advanced Functional Nanostructures for Chemical Sensing)
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11 pages, 3448 KiB  
Article
Tapered Optical Fiber Sensor Coated with Single-Walled Carbon Nanotubes for Dye Sensing Application
by Aleksandr A. Polokhin, Yuri P. Shaman, Pavel A. Itrin, Ivan S. Panyaev, Artem A. Sysa, Sergey V. Selishchev, Evgeny P. Kitsyuk, Alexander A. Pavlov and Alexander Yu. Gerasimenko
Micromachines 2023, 14(3), 579; https://doi.org/10.3390/mi14030579 - 28 Feb 2023
Cited by 2 | Viewed by 1686
Abstract
The present study aimed to improve the optical sensing performance of tapered optical fiber sensors toward aqueous Rhodamine B solution of different concentrations by applying single-walled carbon nanotubes (SWCNTs). The functional coating was formed on the surface of the tapered optical fiber sensor [...] Read more.
The present study aimed to improve the optical sensing performance of tapered optical fiber sensors toward aqueous Rhodamine B solution of different concentrations by applying single-walled carbon nanotubes (SWCNTs). The functional coating was formed on the surface of the tapered optical fiber sensor using an aerosol layer-by-layer deposition method. Before deposition, the SWCNTs were processed with multistage liquid-phase treatment in order to form a stable dispersion. The effect of SWCNT treatment was investigated through Raman spectroscopy. The deposition of 220 layers caused a reduction of up to 60% of the initial optical power of radiation propagating through the optical fiber core. The optical fiber sensor coated with SWCNTs demonstrated significantly higher sensitivity compared to a non-coated sensor in the range of 2–32 mg/L of Rhodamine B concentration in an aqueous solution. The experimental results demonstrated that the sensitivity was increased 10 times from 32 (mg/L)−1, for the non-coated sensor, up to 317 (mg/L)−1 after SWCNT coating deposition. Moreover, the SWCNT-coated sensor demonstrated high repeatability that allowed for the evaluation of the concentration regardless of the previously analyzed dye concentration. Full article
(This article belongs to the Special Issue Advanced Functional Nanostructures for Chemical Sensing)
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12 pages, 2321 KiB  
Article
The Effect of a Rotating Cone on Horseradish Peroxidase Aggregation on Mica Revealed by Atomic Force Microscopy
by Yuri D. Ivanov, Vadim Y. Tatur, Ivan D. Shumov, Andrey F. Kozlov, Anastasia A. Valueva, Irina A. Ivanova, Maria O. Ershova, Nina D. Ivanova, Igor N. Stepanov, Andrei A. Lukyanitsa and Vadim S. Ziborov
Micromachines 2022, 13(11), 1947; https://doi.org/10.3390/mi13111947 - 10 Nov 2022
Viewed by 1263
Abstract
Our study reported herein aims to determine whether an electromagnetic field, induced triboelectrically by a metallic cone, rotating at a frequency of 167 Hz, has an effect on the properties of the horseradish peroxidase (HRP) enzyme. Atomic force microscopy (AFM) was employed to [...] Read more.
Our study reported herein aims to determine whether an electromagnetic field, induced triboelectrically by a metallic cone, rotating at a frequency of 167 Hz, has an effect on the properties of the horseradish peroxidase (HRP) enzyme. Atomic force microscopy (AFM) was employed to detect even the most subtle effects on single enzyme molecules. In parallel, a macroscopic method (spectrophotometry) was used to reveal whether the enzymatic activity of HRP in solution was affected. An aqueous solution of the enzyme was incubated at a distance of 2 cm from the rotating cone. The experiments were performed at various incubation times. The control experiments were performed with a non-rotating cone. The incubation of the HRP solution was found to cause the disaggregation of the enzyme. At longer incubation times, this disaggregation was found to be accompanied by the formation of higher-order aggregates; however, no change in the HRP enzymatic activity was observed. The results of our experiments could be of interest in the development of enzyme-based biosensors with rotating elements such as stirrers. Additionally, the results obtained herein are important for the correct interpretation of data obtained with such biosensors. Full article
(This article belongs to the Special Issue Advanced Functional Nanostructures for Chemical Sensing)
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