Gas sensing properties of defect-controlled ZnO-nanowire gas sensor
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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.; Choi, Kyoung Jin; Lee, J. -H.; Hong, S. -H.
- adsorption; annealing; catalysts; gas sensors; gold; II-VI semiconductors; nanotechnology; nanowires; photoluminescence; vacancies (crystal); wide band gap semiconductors; zinc compounds
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.93, no.26, pp.263103-1 - 263103-2
- 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 °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 H2 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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