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EVALUATION OF THE GRAPHENE NANOSHEETS AS GAS SENSOR FOR NH3 VIA ELECTRICAL PROPERTIES
Surface Review and Letters ( IF 1.1 ) Pub Date : 2020-03-24 , DOI: 10.1142/s0218625x19502159
MUHANAD A. AHMED 1 , HIND Q. MOHAMMAD MONIR 1 , AMAR AL-KEISY 2
Affiliation  

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.

中文翻译:

石墨烯纳米片作为 NH3 气体传感器的电气性能评估

在本文中,石墨烯纳米片用于检测氨气(NH[公式:见正文]。将石墨烯分散体滴铸在特殊的陶瓷基板上以制造气体传感器。测量基于测量气体暴露前后的电阻。 . 发现气体暴露后电阻有相当大的增加。电阻从1.4[公式:见文]k[公式:见文]增加到1.8[公式:见文]k[公式:见文]不到3 [公式:见正文]s。恢复时间也是在室温下测定的,为2[公式:见正文]h。恢复时间的延迟归因于解吸比吸附慢。对氨气的响应计算并证明在大约 5[公式:见文本]分钟后最大响应为 198.6%。
更新日期:2020-03-24
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