Low-Temperature Growth of SnO2 Nanorod Arrays and Tunable n-p-n Sensing Response of a ZnO/SnO2 Heterojunction for Exclusive Hydrogen Sensors

被引：222

作者：

Huang, Hui ^{[1
]}

Gong, Hua ^{[1
]}

Chow, Chee Lap ^{[1
]}

Guo, Jun ^{[2
]}

White, Timothy John ^{[2
,3
]}

Tse, Man Siu ^{[1
]}

Tan, Ooi Kiang ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore

[2] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[3] Australian Natl Univ, Ctr Adv Microscopy, Canberra, ACT 2601, Australia

来源：

ADVANCED FUNCTIONAL MATERIALS | 2011年 / 21卷 / 14期

关键词：

GAS SENSORS; CARBON NANOTUBES; OXIDE NANOWIRE; STORAGE; CO; TRANSITION;

D O I：

10.1002/adfm.201002115

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

Uniform SnO2 nanorod arrays have been deposited at low temperature by plasma-enhanced chemical vapor deposition (PECVD). ZnO surface modification is used to improve the selectivity of the SnO2 nanorod sensor to H-2 gas. The ZnO-modified SnO2 nanorod sensor shows a normal n-type response to 100 ppm CO, NH3, and CH4 reducing gas whereas it exhibits concentration-dependent n-p-n transitions for its sensing response to H-2 gas. This abnormal sensing behavior can be explained by the formation of n-ZnO/p-Zn-O-Sn/n-SnO2 heterojunction structures. The gas sensors can be used in highly selective H-2 sensing and this study also opens up a general approach for tailoring the selectivity of gas sensors by surface modification.

引用

页码：2680 / 2686

页数：7

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