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Enhanced NO2 gas-sensing properties of SnO2 nanorods with a TiO2 capping

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Abstract

The influence of ZnO capping on the NO2 gas-sensing properties of SnO2 nanorods was examined. SnO2-core/TiO2-shell nanorods were fabricated by using a two-step process comprising the thermal evaporation of Sn powders and the metal-organic chemical-vapor deposition of TiO2. The diameters of the SnO2 nanorods ranged from a few tens to a few hundreds of nanometers, and the lengths were up to a few hundreds of micrometers. Transmission electron microscopy and X-ray diffraction showed that the cores and the shells of the nanorods were tetragonal-structured single crystal SnO2 and amorphous TiO2, respectively. Multiple networked SnO2-core/TiO2-shell nanorod sensors showed a response of 65.08% at NO2 concentration of 50 ppm at 100 °C. The response of the SnO2 nanorod sensors to 50-ppm NO2 was increased 29 times when TiO2 capping was used. This substantial improvement can be explained by using a space-charge model.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Inha University, Incheon, 402-751, Korea

    Changhyun Jin, Sunghoon Park, Hyunsu Kim, Taegyung Ko & Chongmu Lee

  2. Bio-IT Convergence Center, Korea Institute of Ceramic Engineering and Technology, Seoul, 153-801, Korea

    Bong-Yong Jeong

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  1. Changhyun Jin
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  2. Sunghoon Park
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  3. Hyunsu Kim
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  4. Taegyung Ko
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  5. Chongmu Lee
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  6. Bong-Yong Jeong
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Correspondence to Chongmu Lee.

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Jin, C., Park, S., Kim, H. et al. Enhanced NO2 gas-sensing properties of SnO2 nanorods with a TiO2 capping. Journal of the Korean Physical Society 61, 1370–1375 (2012). https://doi.org/10.3938/jkps.61.1370

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  • DOI: https://doi.org/10.3938/jkps.61.1370

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