Enhanced sensitivity of graphene ammonia gas sensors using molecular doping

被引：75

作者：

Zanjani, Seyedeh Maryam Mortazavi ^{[1
]}

Sadeghi, Mir Mohammad ^{[1
]}

Holt, Milo ^{[1
]}

Chowdhury, Sk. Fahad ^{[1
]}

Tao, Li ^{[1
]}

Akinwande, Deji ^{[1
]}

机构：

[1] Univ Texas Austin, Microelect Res Ctr, Austin, TX 78758 USA

来源：

APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.4940128

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on employing molecular doping to enhance the sensitivity of graphene sensors synthesized via chemical vapor deposition to NH3 molecules at room temperature. We experimentally show that doping an as-fabricated graphene sensor with NO2 gas improves sensitivity of its electrical resistance to adsorption of NH3 molecules by about an order of magnitude. The detection limit of our NO2-doped graphene sensor is found to be similar to 200 parts per billion (ppb), compared to similar to 1400 ppb before doping. Electrical characterization and Raman spectroscopy measurements on graphene field-effect transistors show that adsorption of NO2 molecules significantly increases hole concentration in graphene, which results in the observed sensitivity enhancement. (C) 2016 AIP Publishing LLC.

引用

页数：5

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