High sensitivity detection of NO2 and NH3 in air using chemical vapor deposition grown graphene

被引：214

作者：

Yavari, Fazel ^{[1
]}

Castillo, Eduardo ^{[1
]}

Gullapalli, Hemtej ^{[2
]}

Ajayan, Pulickel M. ^{[2
]}

Koratkar, Nikhil ^{[1
,3
]}

机构：

[1] Rensselaer Polytech Inst, Dept Mech Aerosp & Nucl Engn, Troy, NY 12180 USA

[2] Rice Univ, Dept Mech & Mat Engn, Houston, TX 77015 USA

[3] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 20期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.4720074

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We show that graphene films synthesized by chemical-vapor-deposition enables detection of trace amounts of nitrogen dioxide (NO2) and ammonia (NH3) in air at room temperature and atmospheric pressure. The gas species are detected by monitoring changes in electrical resistance of the graphene film due to gas adsorption. The sensor response time was inversely proportional to the gas concentration. Heating the film expelled chemisorbed molecules from the graphene surface enabling reversible operation. The detection limits of similar to 100 parts-per-billion (ppb) for NO2 and similar to 500 ppb for NH3 obtained using our device are markedly superior to commercially available NO2 and NH3 detectors. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4720074]

引用

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