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

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

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78 Citations (Scopus)

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 C 2H5OH (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 In 2O3 and the promotion of catalytic dissociation of C 2H5OH into reactive gases.

Original languageEnglish
Pages (from-to)18560-18567
Number of pages8
JournalJournal of Materials Chemistry
Volume21
Issue number46
DOIs
Publication statusPublished - 2011 Dec 14

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

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