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

doi:10.1039/c1jm14252f

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

Research output: Contribution to journal › Article › peer-review

97 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 (R_a/R_g, R_a: resistance in air, R_g: 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 language	English
Pages (from-to)	18560-18567
Number of pages	8
Journal	Journal of Materials Chemistry
Volume	21
Issue number	46
DOIs	https://doi.org/10.1039/c1jm14252f
Publication status	Published - 2011 Dec 14

ASJC Scopus subject areas

Chemistry(all)
Materials Chemistry

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title = "Ultrasensitive and selective C2H5OH sensors using Rh-loaded In2O3 hollow spheres",

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.",

author = "Kim, {Sun Jung} and Hwang, {In Sung} and Na, {Chan Woong} and Kim, {Il Doo} and Kang, {Yun Chan} and Lee, {Jong Heun}",

year = "2011",

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doi = "10.1039/c1jm14252f",

language = "English",

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T1 - Ultrasensitive and selective C2H5OH sensors using Rh-loaded In2O3 hollow spheres

AU - Kim, Sun Jung

AU - Hwang, In Sung

AU - Na, Chan Woong

AU - Kim, Il Doo

AU - Kang, Yun Chan

AU - Lee, Jong Heun

PY - 2011/12/14

Y1 - 2011/12/14

N2 - 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.

AB - 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.

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

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