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- Choi, Kyoung Jin
- Energy Conversion Materials Lab.
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Gas sensing properties of defect-controlled ZnO-nanowire gas sensor
- Author(s)
- Ahn, M. -W., Park, K. -S., Heo, J. -H., Park, J. -G., Kim, D. -W., Choi, Kyoung Jin, Lee, J. -H., Hong, S. -H.
- Issued Date
- 2008-12
- Citation
- APPLIED PHYSICS LETTERS, v.93, no.26, pp.263103-1 - 263103-2
- Abstract
- 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.
- Publisher
- AMER INST PHYSICS
- ISSN
- 0003-6951
- Keyword (Author)
- adsorption, annealing, catalysts, gas sensors, gold, II-VI semiconductors, nanotechnology, nanowires, photoluminescence, vacancies (crystal), wide band gap semiconductors, zinc compounds
- Keyword
- ZINC-OXIDE NANOWIRES, THIN-FILMS, NO2, EMISSION, FIELD
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