Single-phase high-entropy oxide-based chemiresistor: Toward selective and sensitive detection of methane gas for real-time applications

Naganaboina, Venkata Ramesh and Deshpande, Atul Suresh and Singh, Shiv Govind and et al, . (2022) Single-phase high-entropy oxide-based chemiresistor: Toward selective and sensitive detection of methane gas for real-time applications. Sensors and Actuators, B: Chemical, 357. pp. 1-10. ISSN 0925-4005

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Detecting methane (CH4) with good selectivity is one of the most important safety precautions to prevent catastrophic incidents in the current industrial environment. Detection of small molecular size, inert and nonpolar characteristic gases at trace levels using chemiresistive technique at room temperature is still challenging because of weak adsorption between gas and sensing material. Therefore, we fabricated a single-phase high entropy oxide based chemiresistor and tested it towards the various gases and several hydrocarbons at room temperature, but the sensor displayed a higher selectivity to CH4 gas than other gases. Further, the sensor characteristics revealed a significant response to CH4 gas, good response and recovery time, good long-term stability, and an experimental detection limit of 25 ppm. Besides, the as-fabricated sensor is low-cost, small in size and consumes 50 nW power, much lower than the other commercialized light-based sensors. As proof of concept, the fabricated sensor was utilized to measure CH4 gas in a real-time atmosphere. The sensor reflected response characteristics similar to the controlled environment and recovered without carrier gas. This facile approach sheds light on the rational design of high-entropy oxides, paving the way for mass production and commercialization of ultra-trace gas detection sensors with superior sensing capability. © 2022 Elsevier B.V.

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IITH Creators:
IITH CreatorsORCiD
Deshpande, Atul Suresh
Singh, Shiv Govind
Item Type: Article
Additional Information: This work was supported by the project "M2Smart: Smart Cities for Emerging Countries based on Sensing, Network and Big Data Analysis of Multimodal Regional Transport System", JST/JICA SATREPS, Japan. We would like to thank Ghosh Tanmoya Nemai for her help in the laboratory work.
Uncontrolled Keywords: Chemiresistive methane sensor; High-entropy oxide; Real-time atmosphere; Room temperature operation; Selective and sensitive detection; Trace level detection
Subjects: Others > Metallurgy Metallurgical Engineering
Electrical Engineering
Materials Engineering > Materials engineering
Divisions: Department of Electrical Engineering
Department of Material Science Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 13 Jul 2022 10:19
Last Modified: 13 Jul 2022 10:19
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