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ACCEPTED MANUSCRIPT
A proposed device based on MoSe2-ZnO heterojunctions on rGO for enhanced ethanol gas sensing performances at room temperature
Nikita Jain1 and Nitin Puri2
Accepted Manuscript online 28 June 2024
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DOI 10.1088/1361-6528/ad5cf9
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Author e-mailsnitinkumarpuri@dtu.ac.in
Author affiliations1
Delhi Technological University Department of Applied Physics, Delhi, India, Delhi, 110042, INDIA
2 Department of Applied Physics, Delhi Technological University, Delhi, India, Delhi, 110042, INDIA
ORCID iDsNikita Jain https://orcid.org/0009-0002-8718-6153Nitin Puri https://orcid.org/0000-0003-2563-3747
Dates
Received 20 March 2024
Revised 20 May 2024
Accepted 28 June 2024
Accepted Manuscript online 28 June 2024
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10.1088/1361-6528/ad5cf9
Abstract
In this research, we report an enhanced sensing response ethanol gas sensing device based on a ternary nanocomposite of molybdenum diselenide-zinc oxide heterojunctions decorated rGO (MoSe2/ZnO/rGO) at room temperature. The sensing performance of the ternary nanocomposite sensing device has been analysed for various concentrations of ethanol gas (1-500 ppm). The gas-sensing results have revealed that for 500 ppm ethanol gas concentration, the sensing device has exhibited an enhanced response value (Rg/Ra) of 50.2. Significantly, the sensing device has displayed a quick response and recovery time of 6.2 s and 12.9 s respectively. In addition to this, the sensing device has shown a great prospect for long-term detection of ethanol gas (45 days). The sensing device has demonstrated the ability to detect ethanol at remarkably low concentrations of 1 ppm. The enhanced sensing performance of the ternary nanocomposite sensing device has highlighted the effective synergistic effect between MoSe2 nanosheets, ZnO nanorods, and rGO nanosheets. This has been attributed to the formation of two heterojunctions in the ternary nanocomposite sensor: a p-n heterojunction between MoSe2 and ZnO and a p-p heterojunction between MoSe2 and rGO. The analysis of the results has suggested that the proposed MoSe2/ZnO/rGO nanocomposite sensing device could be considered a promising candidate for the real-time detection of ethanol gas.
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