Abstract
In this paper, graphene nanosheets were used to detect ammonia gas (NH[Formula: see text]. 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 1.4[Formula: see text]k[Formula: see text] to 1.8[Formula: see text]k[Formula: see text] just in less than 3[Formula: see text]s. Recovery time is also determined at room temperature and it was 2[Formula: see text]h. 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 5[Formula: see text]min.
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