Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1643649 | Materials Letters | 2014 | 4 Pages |
•Non-reduced graphene oxide films fabricated by a simple spin coating method were demonstrated to measure ethanol gas with high sensitivity.•Transition from n- to p-type gas sensing behavior was observed by heat treatment of non-reduced graphene oxide.•The transition from non-reduced to reduced graphene oxide was confirmed using XPS and FTIR.
Graphene oxide (GO) films were deposited via spin coating on SiO2/Si wafers patterned with interdigitated Pt electrodes. Gas sensing behaviors of GO films and their heat treated films at 200 °C in argon atmosphere were characterized. Apparently, non-reduced graphene oxide exhibits n-type and reduced graphene oxide films show p-type behavior on ethanol gas. The change of oxygen functional groups and bond structure are suggested to explain the transition. The combinatorial use of GO and reduced GO (r-GO) in a gas sensor array will provide practical solutions to measure various gases with high selectivity and sensitivity.