Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 255, Issue -, Pages 1671-1679Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.08.172
Keywords
Gas sensors; Reduced graphene oxide; In2O3; NO2; p-n junction
Funding
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Education, Science, and Technology (MEST) [2016R1A2A1A05005331]
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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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