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Highly selective and sensitive detection of NO2 using rGO-In2O3 structure on flexible substrate at low temperature
- Authors
- Na, Chan Woong; Kim, Jae-Hyeok; Kim, Hyo-Joong; Woo, Hyung-Sik; Gupta, Arunava; Kim, Han-Ki; Lee, Jong-Heun
- Issue Date
- 2월-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Gas sensors; Reduced graphene oxide; In2O3; NO2; p-n junction
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.255, pp.1671 - 1679
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 255
- Start Page
- 1671
- End Page
- 1679
- ISSN
- 0925-4005
- 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 degrees C and negligible cross-responses to C2H5OH, CO, NH3, toluene, H-2, 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. (C) 2017 Elsevier B.V. All rights reserved.
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