Gas sensing properties of defect-controlled ZnO-nanowire gas sensor

被引：672
作者：
Ahn, M. -W. [1 ]
Park, K. -S. [1 ]
Heo, J. -H. [1 ]
Park, J. -G. [1 ]
Kim, D. -W. [1 ]
Choi, K. J. [1 ]
Lee, J. -H. [2 ]
Hong, S. -H. [3 ]
机构：
[1] Korea Adv Inst Sci & Technol, Nano Mat Res Ctr, Seoul 130650, South Korea
[2] Korea Univ, Dept Mat Sci & Engn, Seoul 136701, South Korea
[3] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea
来源：
APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 26期
关键词：
adsorption; annealing; catalysts; gas sensors; gold; II-VI semiconductors; nanotechnology; nanowires; photoluminescence; vacancies (crystal); wide band gap semiconductors; zinc compounds;
D O I：
10.1063/1.3046726
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The effect of oxygen-vacancy-related defects on gas-sensing properties of ZnO-nanowire gas sensors was investigated. Gas sensors were fabricated by growing ZnO nanowires bridging the gap between two prepatterned Au catalysts. The sensor displayed fast response and recovery behavior with a maximum sensitivity to NO2 gas at 225 degrees C. Gas sensitivity was found to be linearly proportional to the photoluminescence intensity of oxygen-vacancy-related defects in both as-fabricated and defect-controlled gas sensors by postannealing in Ar and H-2 atmosphere. This result agrees well with previous theoretical prediction that oxygen vacancies play a role of preferential adsorption sites for NO2 molecules.
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页数：3
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