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

doi:10.1063/1.3046726

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 journal › Article › peer-review

645 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 language	English
Article number	263103
Journal	Applied Physics Letters
Volume	93
Issue number	26
DOIs	https://doi.org/10.1063/1.3046726
Publication status	Published - 2008

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Gas sensing properties of defect-controlled ZnO-nanowire gas sensor",

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.",

author = "Ahn, {M. W.} and Park, {K. S.} and Heo, {J. H.} and Park, {J. G.} and Dong-Wan Kim and Choi, {K. J.} and Lee, {Jong Heun} and Hong, {S. H.}",

note = "Funding Information: This work was supported by the KIST project (2E20680) and NSI-NCRC program (2N30690). ",

year = "2008",

doi = "10.1063/1.3046726",

language = "English",

volume = "93",

journal = "Applied Physics Letters",

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TY - JOUR

T1 - Gas sensing properties of defect-controlled ZnO-nanowire gas sensor

AU - Ahn, M. W.

AU - Park, K. S.

AU - Heo, J. H.

AU - Park, J. G.

AU - Kim, Dong-Wan

AU - Choi, K. J.

AU - Lee, Jong Heun

AU - Hong, S. H.

N1 - Funding Information: This work was supported by the KIST project (2E20680) and NSI-NCRC program (2N30690).

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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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DO - 10.1063/1.3046726

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VL - 93

JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

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

Abstract

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