• 文献标题:   Gas detection using low-temperature reduced graphene oxide sheets
  • 文献类型:   Article
  • 作  者:   LU GH, OCOLA LE, CHEN JH
  • 作者关键词:   adsorption, annealing, charge exchange, electric sensing device, gas sensor, graphene, hole density, nitrogen compound, semiconductor material
  • 出版物名称:   APPLIED PHYSICS LETTERS
  • ISSN:   0003-6951
  • 通讯作者地址:   Univ Wisconsin
  • 被引频次:   299
  • DOI:   10.1063/1.3086896
  • 出版年:   2009

▎ 摘  要

We demonstrate a high-performance gas sensor using partially reduced graphene oxide (GO) sheets obtained through low-temperature step annealing (300 degrees C at maximum) in argon flow at atmospheric pressure. The electrical conductance of GO was measured after each heating cycle to interpret the level of reduction. The thermally reduced GO showed p-type semiconducting behavior in ambient conditions and were responsive to low-concentration NO(2) diluted in air at room temperature. The sensitivity is attributed to the electron transfer from the reduced GO to adsorbed NO(2), which leads to enriched hole concentration and enhanced electrical conduction in the reduced GO sheet.