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Gas Sensing Film Coating
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Gas Sensing Film Coating

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Thin Films".

Deadline for manuscript submissions: closed (20 September 2022) | Viewed by 8445

Special Issue Editors

Prof. Dr. María Dolores Fernández Ramos

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Guest Editor
Facultad de Ciencias, Department of Analytical Chemistry, Universidad de Granada, Granada, Spain
Interests: sensors and biosensors; gas sensors and nanotechnology
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Antonio Luis Medina-Castillo

E-Mail Website
Co-Guest Editor
Faculty of Sciences, University of Granada, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain
Interests: sensor and biosensors; polymer chemistry; nanotechnology and material chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, the determination of gases has received considerable attention for monitoring environmental pollution, industrial emission monitoring and process control, medical diagnosis, public security, and the agriculture and food industry. It is well known that the use of chemical sensors entails a series of advantages, such as sensitivity, selectivity, response over time, stability, durability, reproducibility, and reversibility. This makes them good candidates for the determination of gases, although they are influenced, to a large extent, by the properties of the detection materials used, such as the polymers, semiconductors, carbon graphite, ionic liquids, and organic/inorganic compounds that have been used as gas detection materials. Many efforts are being made to make the sensor layer covering the transducer as sensitive, selective, and stable as possible, in order to increase the application possibilities by using different types of sensors, namely: optical, electrical, surface acoustic wave, quartz crystal microbalance, metal oxide-semiconductor field effect transistor, and so on.

The manufacture, design, and testing of new materials (for example, metals, graphene, carbon, nanotubes, conductive polymers, and ionic liquids), together with new signal measurement systems, such as the use of smartphones or their integration in automatic device measurement, either in the form of dedicated instrumentation or an integrated platform of measurement instruments, provide unprecedented functionality and opportunities for multifunctional coatings, which increase the possibilities of gas sensing.

The scope of this Special Issue will serve as a forum for papers in the following concepts:·

  • Electrospun nanofibers used to obtain a three-dimensional structured fibrous membrane with a controllable pore structure and high specific surface area coating with different kinds of gas sensors, such as acoustic wave, resistive, photoelectric, and optical.
  • Recent developments in nano-engineered materials, including one-dimensional nanostructures, such as nanowires, nanobells, nanotubes, and nanoribbons coatings, for gas sensing.
  • Understanding the influence of particle size, morphology, and doping of metal oxide nanostructure coatings in gas sensing properties.
  • Development of new strategies using coverage with ionic liquids, which lead to the development of new applications in the field of gas sensing.
  • Development of electronic nose systems based on multiple coverages, which facilitate a multi-detection system of gaseous compounds.
  • The latest development of gas-sensing film coatings integrated in portable measuring devices and in multi-sensor platforms for the determination of gases.

Prof. María Dolores Fernández Ramos
Prof. Dr. Antonio Luis Medina-Castillo
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. Coatings 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

  • Gas sensing films
  • Portable device
  • Multi-sensor platforms
  • Materials used for gas sensing coating

Published Papers (3 papers)

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Research

28 pages, 7212 KiB  
Article
PANI-Based Hydrogen Sulfide Gas Sensors
by Meenakshi Kumawat, Devyani Thapliyal, George D. Verros, Raj Kumar Arya, Sanghamitra Barman, Gopinath Halder and Pooja Shandilya
Coatings 2022, 12(2), 186; https://doi.org/10.3390/coatings12020186 - 31 Jan 2022
Cited by 7 | Viewed by 2993
Abstract
A hydrogen sulfide gas-sensitive chemiresistive sensor was screen printed on a flexible polyethylene terphthalate substrate using a nanocomposite of polyaniline(PANI)/WO3/CuCl2 (PET). FE-SEM analysis validated the nanoscale morphology of the composite, which revealed tungsten oxide particles in nano-rectangular forms, i.e., rod-like [...] Read more.
A hydrogen sulfide gas-sensitive chemiresistive sensor was screen printed on a flexible polyethylene terphthalate substrate using a nanocomposite of polyaniline(PANI)/WO3/CuCl2 (PET). FE-SEM analysis validated the nanoscale morphology of the composite, which revealed tungsten oxide particles in nano-rectangular forms, i.e., rod-like structures. The gas-sensing capabilities of the film were affected by the PANI and WO3 ratio, with the optimal ratio of 0.5 showing the best response. It was tested at various H2S gas concentrations and demonstrated a progressive response as the gas concentration increased. PANI/WO3/CuCl2 film was more sensitive than PANI/CuCl2 binary composite film. Around 1 ppm of gas concentration, with a response time of 67.9 s at room temperature, the highest response of two orders of magnitude change was observed, of 93%. This study found that PANI/WO3/CuCl2 is an excellent composite for improving the reversibility and humidity sensitivity of PANI/CuCl2 composite-based chemiresistors during H2S gas sensing, and that screen printing is a simple and cost-effective method for producing stable and uniform film-based chemiresistive gas sensors. Full article
(This article belongs to the Special Issue Gas Sensing Film Coating)
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10 pages, 3595 KiB  
Article
Development of Indium Titanium Zinc Oxide Thin Films Used as Sensing Layer in Gas Sensor Applications
by Sheng-Po Chang, Ren-Hao Yang and Chih-Hung Lin
Coatings 2021, 11(7), 807; https://doi.org/10.3390/coatings11070807 - 3 Jul 2021
Cited by 5 | Viewed by 2015
Abstract
InTiZnO gas sensors with different oxygen ratios were fabricated by RF sputtering at room temperature. The sensing responses for five different gases, including ethanol, isopropanol (IPA), acetone (ACE), CO, and SO2, were reported. The InTiZnO gas sensor with the MSM (metal–semiconductor–metal) [...] Read more.
InTiZnO gas sensors with different oxygen ratios were fabricated by RF sputtering at room temperature. The sensing responses for five different gases, including ethanol, isopropanol (IPA), acetone (ACE), CO, and SO2, were reported. The InTiZnO gas sensor with the MSM (metal–semiconductor–metal) structure generated a higher sensing response when the O2/Ar ratio was increased to 10%. It also revealed high selectivity among these gases and good repeatability. Moreover, the UV light-activated InTiZnO gas sensors were also studied, which could reduce the operating temperature from 300 °C to 150 °C and did not seem to damage the sensing film, demonstrating long-term stability. The high response and selectivity revealed that InTiZnO thin films possess high potential to be applied in gas sensing technology. Full article
(This article belongs to the Special Issue Gas Sensing Film Coating)
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12 pages, 2168 KiB  
Article
Near Infrared Sensor to Determine Carbon Dioxide Gas Based on Ionic Liquid
by María Dolores Fernández-Ramos, Fátima Mirza-Montoro, Luis Fermín Capitán-Vallvey and Isabel María Pérez de Vargas-Sansalvador
Coatings 2021, 11(2), 163; https://doi.org/10.3390/coatings11020163 - 30 Jan 2021
Viewed by 2167
Abstract
In this study we present an NIR carbon dioxide gas sensor based on an inner filter process that includes an ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4), to improve its stability, dynamic behavior and lifetime, which are usually the main drawbacks with [...] Read more.
In this study we present an NIR carbon dioxide gas sensor based on an inner filter process that includes an ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4), to improve its stability, dynamic behavior and lifetime, which are usually the main drawbacks with these sensors. The presence of CO2 causes a displacement of a simple boron-dipyrromethene-type fluorophore, azaBODIPY, as the pH indicator towards its acid form. This increases the emission intensity of Cr(III)-doped gadolinium aluminium borate (GAB) as the luminophore. The characterization of the prepared sensor was carried out and a discussion of the results is presented. The response and recovery times improved considerably, 23 and 49 s, respectively, with respect to the sensor without IL, at 60 and 120 s, respectively,. Additionally, the measurement range is extended when using IL, able in this case to measure in the complete range up to 100% CO2; without IL the measurement range is limited to 60% CO2. The detection limit ranges from 0.57% CO2 without IL to 0.26% CO2 when IL is added. The useful lifetime of the sensing membrane was 20 days for membranes with IL and only 6 days for membranes without IL, with the sensor always kept in the dark and without the need to maintain a special atmosphere. Full article
(This article belongs to the Special Issue Gas Sensing Film Coating)
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