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

M. W. Ahn, K. S. Park, J. H. Heo, J. G. Park, Dong-Wan Kim, K. J. Choi, Jong Heun Lee, S. H. Hong

Research output: Contribution to journalArticlepeer-review

583 Citations (Scopus)

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.

Original languageEnglish
Article number263103
JournalApplied Physics Letters
Volume93
Issue number26
DOIs
Publication statusPublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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