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

MUHANAD A. AHMED

Department of Electrical Technology, Technical Institute of Baghdad, Middle Technical University (MTU), Baghdad, Iraq

E-mail Address: muhanad.adil@mtu.edu.iq

Corresponding author.

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HIND Q. MOHAMMAD MONIR

Department of Electrical Technology, Technical Institute of Baghdad, Middle Technical University (MTU), Baghdad, Iraq

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, and

AMAR AL-KEISY

http://orcid.org/0000-0003-2983-9689

Nanotechnology and Advanced Materials Research Center, University of Technology, Baghdad, Iraq

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https://doi.org/10.1142/S0218625X19502159Cited by:4 (Source: Crossref)

Abstract

In this paper, graphene nanosheets were used to detect ammonia gas (NH $_{3})$ . 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 1.4k $Ω$ to 1.8k $Ω$ 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:

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