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

Xishuang Liang, Tae Hyung Kim, Ji Wook Yoon, Chang Hoon Kwak, Jong Heun Lee

Research output: Contribution to journalArticle

72 Citations (Scopus)

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 × 105 at 150 °C. The CuO-loaded In2O3 nanofibers also exhibited high gas response (9.17 × 103 toward 5 ppm H2S) at room temperature. The CuO-loaded In2O3 nanofibers showed ultrahigh selectivity to H2S concerning interferences with NO2, H2, CO, NH3, C2H5OH, C3H6O, TMA, C7H8, and C8H10 at room temperature and 150 °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.

Original languageEnglish
Pages (from-to)934-942
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume209
DOIs
Publication statusPublished - 2015 Mar 31

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Keywords

  • CuO-loaded InO
  • Electrospinning
  • Gas sensors
  • HS
  • Nanofibers
  • Pulse heating

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Instrumentation

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