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State-of-the Art in Gas Sensors based on Nanomaterials
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State-of-the Art in Gas Sensors based on Nanomaterials

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

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 15913

Special Issue Editors

Dr. Hyeong-U Kim

E-Mail Website
Guest Editor
Department of Plasma Engineering, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
Interests: plasma; 2D materials; synthesis; etch; diagnosis
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jae-Hyun Lee

E-Mail Website
Guest Editor
Department of Materials Science and Engineering and Energy Systems Research, Ajou University, 2016 World Cup-ro, Suwon 16499, Gyeonggi-do, Korea
Interests: 2D nanomateirlas; 2D-based sensors
Special Issues, Collections and Topics in MDPI journals
Dr. Seoung-Ki Lee

E-Mail Website1 Website2
Guest Editor
School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
Interests: 2D material; semiconductor; sensor; flexible electronics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,
  • Gas sensors are the most important tools for monitoring unknown gas concentrations and environmental information to ensure production safety. Nanomaterials are attracting more attention for gas sensors, because of their excellent surface performance, such as 2D nanomaterials. Their unique electrical, optical, and mechanical properties have made them a new type of compact, ubiquitous, wearable sensors. Nanomaterial-based gas sensors have improved sensing performance such as sensitivity, accuracy, and stability for various gases.
  • The development of electronic devices is rapidly advancing due to integration and miniaturation. In addition, the wearable technology is expected to become an integral part of our daily life. It has a high demand for real-time monitoring of exhaled breath and surrounding toxic gases to identify potential risks to health and food safety.
  • This Special Issue is devoted to providing the latest cutting-edge fundamental and applied research on all aspects of gas sensors. Full papers, communications, and reviews on experimental and theoretical studies of gas sensors are all welcome.
  • In the flow of these science and technology, the aim of this Special Issue titled “State-of-the Art in Gas Sensors based on Nanomaterials” is to provide the latest cutting-edge research and development in the field.

Dr. Hyeong-U Kim
Prof. Dr. Jae-Hyun Lee
Dr. Seoung-Ki Lee
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. 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

  • gas sensors
  • nanomateirlas
  • wearable sensors
  • wearable technology
  • real-time monitoring

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Published Papers (5 papers)

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Research

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10 pages, 2230 KiB  
Article
The Fabrication of Cesium Lead Bromide-Coated Cellulose Nanocomposites and Their Effect on the Detection of Nitrogen Gas
by Bumjun Park, Haneul Kang, Soobin Han, Hyeong-U Kim, Youngjin Cho, Yun Suk Huh and Sung-Min Kang
Sensors 2022, 22(20), 7737; https://doi.org/10.3390/s22207737 - 12 Oct 2022
Cited by 2 | Viewed by 1918
Abstract
In this work, we fabricate cesium lead bromide nanofibers (CsPbBr3 NFs) via the attachment of cesium lead bromide nanocrystals (CsPbBr3 NCs) on the surface of electrospun cellulose nanofibers (CNFs) and employ them in a sensor to effectively detect gaseous nitrogen. The [...] Read more.
In this work, we fabricate cesium lead bromide nanofibers (CsPbBr3 NFs) via the attachment of cesium lead bromide nanocrystals (CsPbBr3 NCs) on the surface of electrospun cellulose nanofibers (CNFs) and employ them in a sensor to effectively detect gaseous nitrogen. The CsPbBr3 NFs are produced initially by producing CsPbBr3 NCs through hot injection and dispersing on hexane, followed by dipping CNFs and ultrasonicate for 1 h. Morphological characterization through visual, SEM and TEM image, and crystalline structure analysis by XRD and FT-IR analysis of CsPbBr3 NFs and NCs show similar spectra except for PL due to unavoidable damage during the ultrasonication. Gaseous nitrogen is subsequently detected using the photoluminescence (PL) property of CsPbBr3 NFs, in which the PL intensity dramatically decreases under various flow rate. Therefore, we believe that the proposed CsPbBr3 NFs show significant promise for use in detection sensors in various industrial field and decrease the potential of fatal damage to workers due to suffocation. Full article
(This article belongs to the Special Issue State-of-the Art in Gas Sensors based on Nanomaterials)
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15 pages, 2149 KiB  
Article
Understanding Physicochemical Mechanisms of Sequential Infiltration Synthesis toward Rational Process Design for Uniform Incorporation of Metal Oxides
by Jiwoong Ham, Minkyung Ko, Boyun Choi, Hyeong-U Kim and Nari Jeon
Sensors 2022, 22(16), 6132; https://doi.org/10.3390/s22166132 - 16 Aug 2022
Cited by 5 | Viewed by 2008
Abstract
Sequential infiltration synthesis (SIS) is a novel technique for fabricating organic–inorganic hybrid materials and porous inorganic materials by leveraging the diffusion of gas-phase precursors into a polymer matrix and chemical reactions between the precursors to synthesize inorganic materials therein. This study aims to [...] Read more.
Sequential infiltration synthesis (SIS) is a novel technique for fabricating organic–inorganic hybrid materials and porous inorganic materials by leveraging the diffusion of gas-phase precursors into a polymer matrix and chemical reactions between the precursors to synthesize inorganic materials therein. This study aims to obtain a fundamental understanding of the physicochemical mechanisms behind SIS, from which the SIS processing conditions are rationally designed to obtain precise control over the distribution of metal oxides. Herein, in situ FTIR spectroscopy was correlated with various ex situ characterization techniques to study a model system involving the growth of aluminum oxides in poly(methyl methacrylate) using trimethyl aluminum (TMA) and water as the metal precursor and co-reactant, respectively. We identified the prominent chemical states of the sorbed TMA precursors: (1) freely diffusing precursors, (2) weakly bound precursors, and (3) precursors strongly bonded to pre-existing oxide clusters and studied how their relative contributions to oxide formation vary in relation to the changes in the rate-limiting step under different growth conditions. Finally, we demonstrate that uniform incorporation of metal oxide is realized by a rational design of processing conditions, by which the major chemical species contributing to oxide formation is modulated. Full article
(This article belongs to the Special Issue State-of-the Art in Gas Sensors based on Nanomaterials)
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11 pages, 2191 KiB  
Article
Surface Properties of CVD-Grown Graphene Transferred by Wet and Dry Transfer Processes
by Min-Ah Yoon, Chan Kim, Jae-Hyun Kim, Hak-Joo Lee and Kwang-Seop Kim
Sensors 2022, 22(10), 3944; https://doi.org/10.3390/s22103944 - 23 May 2022
Cited by 11 | Viewed by 3900
Abstract
Graphene, an atomically thin material, has unique electrical, mechanical, and optical properties that can enhance the performance of thin film-based flexible and transparent devices, including gas sensors. Graphene synthesized on a metallic catalyst must first be transferred onto a target substrate using wet [...] Read more.
Graphene, an atomically thin material, has unique electrical, mechanical, and optical properties that can enhance the performance of thin film-based flexible and transparent devices, including gas sensors. Graphene synthesized on a metallic catalyst must first be transferred onto a target substrate using wet or dry transfer processes; however, the graphene surface is susceptible to chemical modification and mechanical damage during the transfer. Defects on the graphene surface deteriorate its excellent intrinsic properties, thus reducing device performance. In this study, the surface properties of transferred graphene were investigated according to the transfer method (wet vs. dry) and characterized using atomic force microscopy, Raman spectroscopy, and contact angle measurements. After the wet transfer process, the surface properties of graphene exhibited tendencies similar to the poly(methyl methacrylate) residue remaining after solvent etching. The dry-transferred graphene revealed a surface closer to that of pristine graphene, regardless of substrates. These results provide insight into the utilization of wet and dry transfer processes for various graphene applications. Full article
(This article belongs to the Special Issue State-of-the Art in Gas Sensors based on Nanomaterials)
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9 pages, 2488 KiB  
Communication
Performance Improvement of Residue-Free Graphene Field-Effect Transistor Using Au-Assisted Transfer Method
by Yamujin Jang, Young-Min Seo, Hyeon-Sik Jang, Keun Heo and Dongmok Whang
Sensors 2021, 21(21), 7262; https://doi.org/10.3390/s21217262 - 31 Oct 2021
Cited by 4 | Viewed by 2630
Abstract
We report a novel graphene transfer technique for fabricating graphene field-effect transistors (FETs) that avoids detrimental organic contamination on a graphene surface. Instead of using an organic supporting film like poly(methyl methacrylate) (PMMA) for graphene transfer, Au film is directly deposited on the [...] Read more.
We report a novel graphene transfer technique for fabricating graphene field-effect transistors (FETs) that avoids detrimental organic contamination on a graphene surface. Instead of using an organic supporting film like poly(methyl methacrylate) (PMMA) for graphene transfer, Au film is directly deposited on the as-grown graphene substrate. Graphene FETs fabricated using the established organic film transfer method are easily contaminated by organic residues, while Au film protects graphene channels from these contaminants. In addition, this method can also simplify the device fabrication process, as the Au film acts as an electrode. We successfully fabricated graphene FETs with a clean surface and improved electrical properties using this Au-assisted transfer method. Full article
(This article belongs to the Special Issue State-of-the Art in Gas Sensors based on Nanomaterials)
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Review

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26 pages, 42761 KiB  
Review
Chromism-Integrated Sensors and Devices for Visual Indicators
by Hyunho Seok, Sihoon Son, Jinill Cho, Sanghwan Choi, Kihong Park, Changmin Kim, Nari Jeon, Taesung Kim and Hyeong-U Kim
Sensors 2022, 22(11), 4288; https://doi.org/10.3390/s22114288 - 4 Jun 2022
Cited by 8 | Viewed by 3944
Abstract
The bifunctionality of chromism-integrated sensors and devices has been highlighted because of their reversibility, fast response, and visual indication. For example, one of the representative chromism electrochromic materials exhibits optical modulation under ion insertion/extraction by applying a potential. This operation mechanism can be [...] Read more.
The bifunctionality of chromism-integrated sensors and devices has been highlighted because of their reversibility, fast response, and visual indication. For example, one of the representative chromism electrochromic materials exhibits optical modulation under ion insertion/extraction by applying a potential. This operation mechanism can be integrated with various sensors (pressure, strain, biomolecules, gas, etc.) and devices (energy conversion/storage systems) as visual indicators for user-friendly operation. In this review, recent advances in the field of chromism-integrated systems for visual indicators are categorized for various chromism-integrated sensors and devices. This review can provide insights for researchers working on chromism, sensors, or devices. The integrated chromic devices are evaluated in terms of coloration-bleach operation, cycling stability, and coloration efficiency. In addition, the existing challenges and prospects for chromism-integrated sensors and devices are summarized for further research. Full article
(This article belongs to the Special Issue State-of-the Art in Gas Sensors based on Nanomaterials)
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