Low-resistance gas sensors fabricated from multiwalled carbon nanotubes coated with a thin tin oxide layer

被引：187
|
作者：
Liang, YX [1 ]
Chen, YJ [1 ]
Wang, TH [1 ]
机构：
[1] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 04期
基金：
中国国家自然科学基金;
关键词：
The authors acknowledge support from the Special Funds for Major State Basic Research Project No. G2001CB3095 in China and also from the National Natural Science Foundation of China through Grant Nos. 69925410 and 60236010;
D O I：
10.1063/1.1775879
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Gas sensors have been fabricated from multiwalled carbon nanotubes (MWNTs) coated with a thin tin oxide layer, and have been used to detect oxidizing and reducing gases down to a ppm level. The barriers between the tin oxide nanocrystal grains on the MWNTs dominate the sensor resistance in different gases, and the conducting carriers in the MWNTs have a low resistance, which make the resistance of the sensors much lower than that of SnO2 nanobelt sensors. The resistance is 130 kOmega in air, 230 kOmega in 2 ppm NO2, and 2.8 MOmega in 50 ppm NO2, so that impedance matching with amplifying circuits can be easily achieved. (C) 2004 American Institute of Physics.
引用
收藏
页码：666 / 668
页数：3
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