EVALUATION OF THE GRAPHENE NANOSHEETS AS GAS SENSOR FOR NH3 VIA ELECTRICAL PROPERTIES

Muhanad A. Ahmed, Hind Q. Mohammad Monir and Amar Al-Keisy
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Muhanad A. Ahmed: Department of Electrical Technology, Technical Institute of Baghdad, Middle Technical University (MTU), Baghdad, Iraq
Hind Q. Mohammad Monir: Department of Electrical Technology, Technical Institute of Baghdad, Middle Technical University (MTU), Baghdad, Iraq
Amar Al-Keisy: #x2020;Nanotechnology and Advanced Materials Research Center, University of Technology, Baghdad, Iraq

Surface Review and Letters (SRL), 2020, vol. 27, issue 10, 1-5

Abstract: In this paper, graphene nanosheets were used to detect ammonia gas (NH3). Graphene dispersion was drop cast on special ceramic substrate to fabricate the gas sensor. The measurements were based on measuring the resistance before and after the gas exposure. A considerable increase in the resistance after gas exposure was found. Resistance increased from 1.4kΩ to 1.8kΩ just in less than 3s. Recovery time is also determined at room temperature and it was 2h. The delay in recovery time was ascribed to the fact that desorption is slower than the adsorption. Response to ammonia gas is calculated and demonstrates a maximum response of 198.6% after about 5min.

Keywords: Graphene nanosheets; resistance mode; NH3 gas sensor; exposure (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19502159

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