A chemical route to graphene for device applications.
Oxidation of graphite produces graphite oxide, which is dispersible in water as individual platelets. After deposition onto Si/SiO2 substrates, chemical reduction produces graphene sheets. Electrical conductivity measurements indicate a 10000-fold increase in conductivity after chemical reduction to graphene. Tapping mode atomic force microscopy measurements show one to two layer graphene steps. Electrodes patterned onto a reduced graphite oxide film demonstrate a field effect response when the gate voltage is varied from +15 to -15 V. Temperature-dependent conductivity indicates that the graphene-like sheets exhibit semiconducting behavior.
Gilje
Scott
S
Department of Chemistry and Biochemistry and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, USA.
Han
Song
S
Wang
Minsheng
M
Wang
Kang L
KL
Kaner
Richard B
RB
D004553:Electric Conductivity; D004566:Electrodes; D004867:Equipment Design; D006108:Graphite / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D010087:Oxides / Q000737:chemistry; D012666:Semiconductors; D012825:Silicon / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature
D010087:Oxides; D012822:Silicon Dioxide; D006108:Graphite; D012825:Silicon