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Ultrasensitive and ultraselective detection of H2S using electrospun CuO-loaded In2O3 nanofiber sensors assisted by pulse heating

Authors
Liang, XishuangKim, Tae-HyungYoon, Ji-WookKwak, Chang-HoonLee, Jong-Heun
Issue Date
31-3월-2015
Publisher
ELSEVIER SCIENCE SA
Keywords
H2S; Gas sensors; CuO-loaded In2O3; Nanofibers; Electrospinning; Pulse heating
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.209, pp.934 - 942
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
Volume
209
Start Page
934
End Page
942
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/94076
DOI
10.1016/j.snb.2014.11.130
ISSN
0925-4005
Abstract
Pure and CuO-loaded In2O3 nanofibers were prepared by electrospinning and their H2S sensing characteristics were investigated. The loading of CuO on In2O3 nanofibers significantly enhanced the gas response (ratio of the resistance in air to that in gas) toward 5 ppm H2S from 515 to 1.16 x 10(5) at 150 degrees C. The CuO-loaded In2O3 nanofibers also exhibited high gas response (9.17 x 10(3) toward 5 ppm H2S) at room temperature. The CuO-loaded In2O3 nanofibers showed ultrahigh selectivity to H2S concerning interferences with NO2, H-2, CO, NH3, C2H5OH, C3H6O, TMA, C7H8, and C8H10 at room temperature and 150 degrees C. The operation of the sensor using pulse heating was suggested reliable H2S sensing with complete recovery. The ultrasensitivie and ultraselective H2S sensing characteristics are explained in terms of the creation and disruption of p-n junctions in the presence and absence of H2S, respectively, the high specific surface area provided by the networks of one-dimensional polycrystalline nanofibers, and the abundance of p-n junctions due to the uniform mixing between p-CuO and n-In2O3 nanograins within the nanofibers. (C) 2014 Elsevier B.V. All rights reserved.
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