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

Ahn, M. -W.; Park, K. -S.; Heo, J. -H.; Park, J. -G.; Kim, D. -W.; Choi, K. J.; Lee, J. -H.; Hong, S. -H.

doi:10.1063/1.3046726

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

Ahn, M. -W.;
Park, K. -S.;
Heo, J. -H.;
Park, J. -G.;
Kim, D. -W.;
외 3명

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초록

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.

키워드

adsorption; annealing; catalysts; gas sensors; gold; II-VI semiconductors; nanotechnology; nanowires; photoluminescence; vacancies (crystal); wide band gap semiconductors; zinc compounds; THIN-FILMS; NO2; EMISSION; FIELD

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

저자: Ahn, M. -W.; Park, K. -S.; Heo, J. -H.; Park, J. -G.; Kim, D. -W.; Choi, K. J.; Lee, J. -H.; Hong, S. -H.

DOI: 10.1063/1.3046726

발행일: 2008-12-29

유형: Article

저널명: Applied Physics Letters

권: 93

호: 26