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Chemosensors
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Novel Materials for Gas Sensing
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Novel Materials for Gas Sensing

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Materials for Chemical Sensing".

Deadline for manuscript submissions: closed (30 April 2025) | Viewed by 3477

Special Issue Editors

Dr. Cristian Viespe

E-Mail Website
Guest Editor
Laser Department, National Institute of Laser, Plasma and Radiation Physics, 077125 Magurele, Romania
Interests: surface acoustic wave sensors; hydrogen sensors; thin films; pulsed laser deposition; nanomaterials
Special Issues, Collections and Topics in MDPI journals
Dr. Cornelia Enache

E-Mail Website
Guest Editor
Laser Department, National Institute of Laser, Plasma and Radiation Physics, 077125 Magurele, Romania
Interests: nanomaterials (nanoparticles/thin films) obtained by laser methods with applications in solar cells and biology

Special Issue Information

Dear Colleagues,

Taking into account that there is intensive research in the development of different materials with gas sensing applications, the importance of this Special Issue is more than obvious in this field.

It has been demonstrated that by using novel materials for gas sensing devices, new possibilities are opened and sensor performances are improved.

The classes of materials used in gas sensors are diverse and include polymers, metals, oxides, carbon-based materials, and composites. Polymers, for instance, are often used because of their ability to respond to changes in the surrounding gas environment. Metals, on the other hand, are known for their high conductivity and can be tailored to react specifically to certain gases. Oxides, especially metal oxides, are widely used in gas sensors due to their sensitivity to changes in gas concentration and to their semiconducting properties. Carbon-based materials, such as carbon nanotubes and graphene, have recently emerged as promising candidates for gas sensing due to their exceptional physical and chemical properties. Composites, which are combinations of two or more materials, offer the advantage of combining the best properties of each component material.

Regarding the transduction principles, they refer to the methods used to convert the interaction between the sensor material and the target gas into a measurable signal. The most common transduction principles include resistance, capacitance, mass, optical, and thermal methods.This Special Issue aims to publish new and original research on novel materials obtained by different techniques with applications in the gas sensor domain.

It is our pleasure to invite you to publish in this Special Issue and we look forward to submissions of your research papers, reviews of the state of the art, or short communications.

Dr. Cristian Viespe
Dr. Cornelia Enache
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. Chemosensors 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 2000 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

  • novel materials
  • nanostructures
  • gas sensor

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

15 pages, 3737 KiB  
Article
Effect of CTAB on the Morphology of Sn-MOF and the Gas Sensing Performance of SnO2 with Different Crystal Phases for H2 Detection
by Manyi Liu, Liang Wang, Shan Ren, Bofeng Bai, Shouning Chai, Chi He, Chunli Zheng, Xinzhe Li, Xitao Yin and Chunbao Charles Xu
Chemosensors 2025, 13(5), 192; https://doi.org/10.3390/chemosensors13050192 - 21 May 2025
Abstract
Herein, a facile strategy was proposed to enhance the gas sensing performance of SnO2 for H2 by regulating its crystalline phase composition. Sn-based metal–organic framework (Sn-MOF) precursors with different morphologies were synthesized by introducing the surfactant cetyltrimethylammonium bromide (CTAB). Upon calcination, [...] Read more.
Herein, a facile strategy was proposed to enhance the gas sensing performance of SnO2 for H2 by regulating its crystalline phase composition. Sn-based metal–organic framework (Sn-MOF) precursors with different morphologies were synthesized by introducing the surfactant cetyltrimethylammonium bromide (CTAB). Upon calcination, these precursors yielded either mixed-phase (orthorhombic and tetragonal, SnO2-C) or single-phase (pure tetragonal, SnO2-NC) SnO2 nanoparticles. Structural characterization and gas sensing tests revealed that SnO2-C exhibited a high response of 7.73 to 100 ppm H2 at 280 °C, more than twice that of SnO2-NC (3.75). Moreover, SnO2-C demonstrated a faster response/recovery time (10/56 s), high selectivity, a ppb-level detection limit (~79 ppb), and excellent long-term stability. Notably, although the addition of CTAB reduced the specific surface area of SnO2, the resulting lower surface area minimized oxygen exposure during calcination, facilitating the formation of a mixed-phase heterostructure. In addition, the calcination atmosphere of SnO2-C (flowing air or Ar) was adjusted to further investigate the role of the crystal phase in gas sensing performance. The results clearly demonstrated that mixed-phase SnO2 exhibited superior sensing performance, achieving a higher sensitivity and a faster response to H2. These findings underscored the critical role of crystal phase engineering in the design of high-performance gas sensing materials. Full article
(This article belongs to the Special Issue Novel Materials for Gas Sensing)
20 pages, 14063 KiB  
Article
TiO2 Ceramic Nanotubes—Conducting Polymer Assemblies with Embedded Gold Particles for Potential Use as Chemosensors in the Detection of Oral Diseases
by Oliver Daniel Schreiner, Alexandru F. Trandabat, Romeo Cristian Ciobanu and Thomas Gabriel Schreiner
Chemosensors 2025, 13(4), 117; https://doi.org/10.3390/chemosensors13040117 - 22 Mar 2025
Viewed by 2030
Abstract
Our research outlines a method for creating chemosensors utilizing hybrid nanostructures derived from TiO2 ceramic nanotubes alongside conducting polymers, with embedded gold nanoparticles. The method used to create hybrid nanostructures from ceramic nanotubes and conducting polymers was drop-casting. AFM analysis highlighted an [...] Read more.
Our research outlines a method for creating chemosensors utilizing hybrid nanostructures derived from TiO2 ceramic nanotubes alongside conducting polymers, with embedded gold nanoparticles. The method used to create hybrid nanostructures from ceramic nanotubes and conducting polymers was drop-casting. AFM analysis highlighted an increased roughness, particularly for PANI-EB, exhibiting a significantly larger grain size exceeding 3.5 μm, with an increased inclusion of gold and uniform arrangement on the surface. The Rku parameter values being around three suggested that the layers primarily exhibited peaks rather than depressions, showing a Gaussian distribution. A chemiresistor was created by using an ink-jet printer and a multilayer metallization was achieved with commercial silver ink for printed electronics. Based on the experimental calibration curve, which exhibits adequate linearity over a wider range of H2S concentrations in air up to 1 ppm, the detection limit was established at 0.1 ppm, a threshold appropriate for recognizing oral diseases. The sensor is a simple, affordable, and durable device designed for individual use, offering significant benefits for patients by enabling improved tracking of the syndrome’s advancement or treatment success. Full article
(This article belongs to the Special Issue Novel Materials for Gas Sensing)
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18 pages, 3646 KiB  
Article
A NO2 Sensitive MnO2/Graphene Oxide Composite Based Gas Sensor
by Mohamed Ayoub Alouani, Juan Casanova-Chafer, Santiago de Bernardi-Martín, Alejandra García-Gómez, Xavier Vilanova and Eduard Llobet
Chemosensors 2025, 13(3), 96; https://doi.org/10.3390/chemosensors13030096 - 8 Mar 2025
Viewed by 938
Abstract
Nanosized manganese dioxide (MnO2) material has been successfully incorporated into a graphene oxide (GO) sensitive layer. Since this type of heterojunction has never been reported in the literature related to gas sensing, these sensors were prepared, tested, and reported. The morphological [...] Read more.
Nanosized manganese dioxide (MnO2) material has been successfully incorporated into a graphene oxide (GO) sensitive layer. Since this type of heterojunction has never been reported in the literature related to gas sensing, these sensors were prepared, tested, and reported. The morphological properties and composition of the MnO2@GO material have been thoroughly studied via FESEM, XRD, Raman spectroscopy, HR-TEM, and ATR-IR. Gas sensitivity and selectivity towards mainly NO2 and other gases (NH3, CO, ethanol, benzene, and H2) have also been studied. The obtained sensors were exposed to different concentrations of NO2 ranging from 200 ppb to 1000 ppb at 150 °C and under close to real conditions (25% relative humidity and 70% relative humidity). The MnO2@GO sensors have shown a high response of 16.3% towards 1 ppm of NO2 under dry conditions and a higher response of 44% at 70% RH towards the same concentration. Finally, it has also shown a strong sensitivity for NO2. Full article
(This article belongs to the Special Issue Novel Materials for Gas Sensing)
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