Mechanism of NO2 detection in carbon nanotube field effect transistor chemical sensors

被引：130

作者：

Zhang, J ^{[1
]}

Boyd, A ^{[1
]}

Tselev, A ^{[1
]}

Paranjape, M ^{[1
]}

Barbara, P ^{[1
]}

机构：

[1] Georgetown Univ, Dept Phys, Washington, DC 20057 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 12期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2187510

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report an experimental method that clearly determines the sensing mechanism of carbon-nanotube field effect transistors. The nanotube/electrode contacts are covered with a thick and long passivation layer that hinders their exposure to chemicals in a controlled fashion, leaving only the midsection of the nanotube exposed. In the case of nitrogen dioxide, a considerably delayed response is fully consistent with the diffusion of the gas through the passivation layer. The results clearly indicate that nitrogen dioxide detection is due to changes at the interfaces between the nanotube and the electrodes and not to molecules adsorbed on the nanotube surface.

引用

页数：3

共 10 条

[1]

APPENZELLER J, 2000, PHYS REV LETT, V89, P6801

[2] Short-channel effects in contact-passivated nanotube chemical sensors [J].