Improved NO2 sensing properties at low temperature using reduced graphene oxide nanosheet-In2O3 heterojunction nanofibers

Research output: Contribution to journalArticle

Authors

  • Chao Yan
  • Hongbing Lu
  • Jianzhi Gao
  • Ying Zhang
  • Haoxuan Ding
  • Gangqiang Zhu
  • Zhibo Yang
  • Chunlan Wang
  • Fenfen Wei

Colleges, School and Institutes

External organisations

  • School of Physics and Information Technology, Shaanxi Normal University
  • Engineering University of PAP
  • School of Physics and Astronomy, University of Birmingham
  • School of Science, Xi'an Polytechnic University

Abstract

Pure In2O3 and reduced graphene oxide (rGO)–In2O3 composite nanofibers are prepared by a facile electrospinning technique. Low-temperature gas-sensing properties to NO2 of the produced nanofibers are evaluated. Our results indicate that in comparison with pure In2O3 nanofibers, the rGO–In2O3 heterojunction nanofibers display much better sensing properties in response, selectivity and detection limit to NO2. Moreover, the weight ratios of rGO to In2O3 are used as a parameter to estimate the best gas-sensing properties of rGO–In2O3 nanofibers. Consequently, the heterojunction nanofibers with an optimized amount of rGO (2.2 wt%) exhibit the highest response of 42 to 5 ppm NO2 at the low operating temperature of 50 °C, which is 4.4 times higher than that of pristine In2O3. From our perspective, the enhanced sensing properties of the composite nanofibers can be mainly attributed to the formation of p–n heterojunctions between rGO and In2O3, and ultrahigh specific surface area as well as strong gas adsorption capacity of rGO nanosheets. These excellent gas-sensing properties make the rGO–In2O3 heterojunction nanofibers attractive to application for low-temperature NO2 gas sensors.

Details

Original languageEnglish
Pages (from-to)908-917
JournalJournal of Alloys and Compounds
Volume741
Early online date14 Feb 2018
Publication statusPublished - 15 Apr 2018

Keywords

  • In2O3 , reduced graphene oxide , electospinning , p-n junctions , gas sensor