Highly selective and sensitive detection of NO2 using rGO-In2O3 structure on flexible substrate at low temperature

Chan Woong Na, Jae Hyeok Kim, Hyo Joong Kim, Hyung Sik Woo, Arunava Gupta, Han Ki Kim, Jong Heun Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Reduced graphene oxide (rGO)-In2O3 hybrid materials were prepared by a solvothermal reaction of an In precursor containing rGO sheets, which were coated onto flexible substrates for gas sensors. The rGO-In2O3 flexible sensors showed a high and reversible response (resistance ratio = 22.3) to 500 ppb NO2 at 150 °C and negligible cross-responses to C2H5OH, CO, NH3, toluene, H2, and HCHO. The ultrahigh response and selectivity of rGO-In2O3 hybrid materials to NO2 were attributed to the chemical affinity of rGO to NO2 and the extension of the electron depletion layer in n-type In2O3 forming a p-n junction with the p-type rGO.

Original languageEnglish
Pages (from-to)1671-1679
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume255
DOIs
Publication statusPublished - 2018 Feb 1

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Keywords

  • Gas sensors
  • InO
  • NO
  • p-n junction
  • Reduced graphene oxide

ASJC Scopus subject areas

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

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