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Dependence of the selectivity of SnO2 nanorod gas sensors on functionalization materials

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Abstract

Effects of functionalization materials on the selectivity of SnO2 nanorod gas sensors were examined by comparing the responses of SnO2 one-dimensional nanostructures functionalized with CuO and Pd to ethanol and H2S gases. The response of pristine SnO2 nanorods to 500 ppm ethanol was similar to 100 ppm H2S. CuO-functionalized SnO2 nanorods showed a slightly stronger response to 100 ppm H2S than to 500 ppm ethanol. In contrast, Pd-functionalized SnO2 nanorods showed a considerably stronger response to 500 ppm ethanol than to 100 ppm H2S. In other words, the H2S selectivity of SnO2 nanorods over ethanol is enhanced by functionalization with CuO, whereas the ethanol selectivity of SnO2 nanorods over H2S is enhanced by functionalization with Pd. This result shows that the selectivity of SnO2 nanorods depends strongly on the functionalization material. The ethanol and H2S gas sensing mechanisms of CuO- and Pd-functionalized SnO2 nanorods are also discussed.

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Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2010-0020163).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon, 402-751, Republic of Korea

    Sunghoon Park, Soohyun Kim, Hyunsung Ko & Chongmu Lee

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  1. Sunghoon Park
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  2. Soohyun Kim
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  3. Hyunsung Ko
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Correspondence to Chongmu Lee.

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Park, S., Kim, S., Ko, H. et al. Dependence of the selectivity of SnO2 nanorod gas sensors on functionalization materials. Appl. Phys. A 117, 1259–1267 (2014). https://doi.org/10.1007/s00339-014-8514-0

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