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Dependence of the gas sensing properties of ZnO nanowires on their microstructure

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Abstract

Two different types of ZnO nanowires were synthesized by the thermal evaporation of different material powders: ZnS powders for ZnO nanowires A; and a mixture of ZnO and graphite powders for ZnO nanowires B. ZnO nanowires A were found to have a bamboo structure consisting of many hexagonal plates each of which is a single crystal, whereas ZnO nanowires B were single crystals with no grain boundary at all. ZnO nanowires B had a far higher degree of preferred orientation than ZnO nanowires A. The sensing properties of ZnO nanowires A were superior to those of ZnO nanowires B in terms of the sensing response and sensing speed. ZnO nanowires A showed an approximately 440 % response at 5 ppm NO2 at 300 °C, whereas ZnO nanowires B showed an approximately 150 % response under the same condition. ZnO nanowires A showed considerably shorter response and recovery times than ZnO nanowires B under the same condition. The superior sensing properties of ZnO nanowires A compared to ZnO nanowires B can be explained mainly by carrier modulation of the depletion layer formed across the grain boundaries of nanowires A.

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Acknowledgements

This study was supported by the Korea Research Foundation through ‘the 2010 Core Research Program’.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Inha University, Yonghyun-dong, Nam-gu, Incheon, 402-751, Republic of Korea

    Sunghoon Park, Soyeon An, Changhyun Jin & Chongmu Lee

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  1. Sunghoon Park
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  2. Soyeon An
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  3. Changhyun Jin
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  4. Chongmu Lee
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Correspondence to Chongmu Lee.

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Park, S., An, S., Jin, C. et al. Dependence of the gas sensing properties of ZnO nanowires on their microstructure. Appl. Phys. A 108, 35–40 (2012). https://doi.org/10.1007/s00339-012-6998-z

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