Gas detection using low-temperature reduced graphene oxide sheets

被引：367
|
作者：
Lu, Ganhua [1 ]
Ocola, Leonidas E. [2 ]
Chen, Junhong [1 ]
机构：
[1] Univ Wisconsin, Dept Mech Engn, Milwaukee, WI 53211 USA
[2] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 08期
基金：
美国国家科学基金会;
关键词：
adsorption; annealing; charge exchange; electric sensing devices; gas sensors; graphene; hole density; nitrogen compounds; semiconductor materials; GRAPHITE OXIDE; FILMS; CONDUCTIVITY; REDUCTION; VAPOR;
D O I：
10.1063/1.3086896
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We demonstrate a high-performance gas sensor using partially reduced graphene oxide (GO) sheets obtained through low-temperature step annealing (300 degrees C at maximum) in argon flow at atmospheric pressure. The electrical conductance of GO was measured after each heating cycle to interpret the level of reduction. The thermally reduced GO showed p-type semiconducting behavior in ambient conditions and were responsive to low-concentration NO2 diluted in air at room temperature. The sensitivity is attributed to the electron transfer from the reduced GO to adsorbed NO2, which leads to enriched hole concentration and enhanced electrical conduction in the reduced GO sheet.
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页数：3
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