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Gas detection using low-temperature reduced graphene oxide sheets

Appl. Phys. Lett. 94, 083111 (2009); doi:10.1063/1.3086896

Published 27 February 2009

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Ganhua Lu,1 Leonidas E. Ocola,2 and Junhong Chen1
1Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
2Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
We demonstrate a high-performance gas sensor using partially reduced graphene oxide (GO) sheets obtained through low-temperature step annealing (300 °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 NO2 diluted in air at room temperature. The sensitivity is attributed to the electron transfer from the reduced GO to adsorbed NO2, which leads to enriched hole concentration and enhanced electrical conduction in the reduced GO sheet. ©2009 American Institute of Physics
History: Received 12 January 2009; accepted 2 February 2009; published 27 February 2009
Permalink: http://link.aip.org/link/?APPLAB/94/083111/1
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KEYWORDS and PACS

Keywords
PACS
  • 07.07.Df
    Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
  • 81.40.Ef
    Cold working, work hardening and annealing
  • 68.43.Mn
    Adsorption kinetics
  • 72.20.-i
    Electrical conductivity phenomena in semiconductors and insulators
  • 72.80.Rj
    Electrical conductivity of fullerenes and related materials
  • YEAR: 2009

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ISSN:
0003-6951 (print)   1077-3118 (online)
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