Ultrasensitive And Selective C2H5OH Sensors Using Rh-loaded ...

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Journal of Materials Chemistry

Ultrasensitive and selective C2H5OH sensors using Rh-loaded In2O3 hollow spheres†

Sun-Jung Kim,a In-Sung Hwang,a Chan Woong Na,a Il-Doo Kim,b Yun Chan Kangc and Jong-Heun Lee*a Author affiliations

* Corresponding authors

a Department of Materials Science and Engineering, Korea University, Seoul, Republic of Korea E-mail: [email protected]

b Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea

c Department of Chemical Engineering, Konkuk University, Seoul, Republic of Korea

Abstract

Rh-loaded In2O3 hollow spheres with diameters of ∼2 μm were prepared by a one-pot hydrothermal reaction of aqueous solution containing indium nitrate, rhodium chloride, and glucose and subsequent heat treatment at 500 °C for 2 h. The response to 100 ppm C2H5OH (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) of 1.67 at% Rh-loaded In2O3 hollow spheres was 4748, which was ∼180 times higher than that of pure In2O3 hollow spheres. Rh loading decreased the temperature for maximum gas response from 475 °C to 371 °C, which also enhanced the selectivity to C2H5OH 15.1–24.7 times and recovery speed. The ultrahigh sensitivity and selectivity to C2H5OH, the lower sensing temperature, and the reduced recovery time were attributed to electronic interactions between Rh and In2O3 and the promotion of catalytic dissociation of C2H5OH into reactive gases.

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Article information

DOI https://doi.org/10.1039/C1JM14252F Article type Paper Submitted 30 Aug 2011 Accepted 12 Oct 2011 First published 26 Oct 2011

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J. Mater. Chem., 2011,21, 18560-18567 BibTex EndNote MEDLINE ProCite ReferenceManager RefWorks RIS

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Ultrasensitive and selective C2H5OH sensors using Rh-loaded In2O3 hollow spheres

S. Kim, I. Hwang, C. W. Na, I. Kim, Y. C. Kang and J. Lee, J. Mater. Chem., 2011, 21, 18560 DOI: 10.1039/C1JM14252F

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Sun-Jung Kim In-Sung Hwang Chan Woong Na Il-Doo Kim Yun Chan Kang Jong-Heun Lee

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