Fabrication of highly selective NO2gas sensor for low ppm detection

Naganaboina, V.R. and Singh, S.G. (2021) Fabrication of highly selective NO2gas sensor for low ppm detection. In: 21st IEEE International Conference on Nanotechnology, NANO 2021, 28 July 2021 through 30 July 2021, Virtual, Montreal.

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Abstract

Nitrogen dioxide (NO2) is one of the most harmful and highly toxic gas, and it is continuously released into the environment from automotive emissions, industrial emissions, and agriculture activities. According to the American Conference of Governmental Industrial Hygienists (ACGIH), the threshold limit value (TLV) of NO2 is up to 3 ppm for 8 h time-weighted average and 5 ppm for 15 min period. Therefore, the efficient detection of low concentration of NO2 gas is significant for monitoring human health in the near above-mentioned sources. In this aspect, transition metal dichalcogenides (TMDs) based gas sensor holds a promising potential for detecting the toxic gas due to their inherent properties such as, high surface to volume ratio and small intrinsic dimension. Among TMDs, tin disulfide (SnS2) has become a promising sensing material in gas sensing applications, owing to its physical affinity, planar crystal structure, and high specific surface area. Herein, SnS2 was synthesized by hydrothermal method and characterized by X-ray diffraction (XRD) and Raman spectroscopy. Subsequently, the chemiresistive gas sensor was fabricated by depositing SnS2 on the glass substrate which has gold (Au) interdigitated electrode pattern. The fabricated sensor was explored for detecting various gases such as CO, CO2, SO2, NH3, and NO2 at different temperatures (27Â°C, 60Â°C, 100Â°C, 150Â°C, 200Â°C, and 250Â°C) and a maximum response of 24.5% was obtained for 6 ppm NO2 gas at a temperature of 100Â°C, which demonstrates that the sensor is a highly selective among the other gases. Furthermore, the sensor was utilized to detect the range of NO2 concentrations from 1.5 ppm to 6 ppm at an optimum temperature of 100Â°C and the results revealed that the experimental detection limit is 1.5 ppm, and the response of the sensor was also observed to be a power law behavior. In addition, the plausible sensing mechanism was explored by use of surface charge transfer to NO2 gas and energy barrier modulation at the surface of SnS2. Â© 2021 IEEE.

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IITH Creators:

IITH Creators	ORCiD
Singh, Shiv Govind	http://orcid.org/0000-0001-7319-879X

Item Type:

Conference or Workshop Item (Paper)

Additional Information:

ISSN: 1944-9399

Uncontrolled Keywords:

American conference of governmental industrial hygienists; Gas sensing applications; High specific surface area; High surface-to-volume ratio; Inter-digitated electrodes; Threshold limit values; Time-weighted averages; Transition metal dichalcogenides

Subjects:

Electrical Engineering

Divisions:

Department of Electrical Engineering

Depositing User:

Mrs Haseena VKKM

Date Deposited:

26 Apr 2022 04:36

Last Modified:

26 Apr 2022 04:36

URI:

http://raiithold.iith.ac.in/id/eprint/9247