期刊
ACS NANO
卷 4, 期 8, 页码 4806-4814出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn1006368
关键词
graphene; graphite; oxide; carbon; nanostructure
类别
资金
- Alliance for Nanohealth [W8XWH-07-2-0101]
- M-I-SWACO
- Air Force Research Laboratory through University Technology Corporation [09-S568-064-01-C1]
- U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy within the Hydrogen Sorption Center of Excellence [DE-FC-36-05GO15073]
- Office of Naval Research
- AFOSR [FA9550-09-1-0581]
- Federal Aviation Administration [2007G010]
An improved method for the preparation of graphene oxide (GO) is described. Currently, Hummers' method (KMnO4, NaNO3, H2SO4) is the most common method used for preparing graphene oxide. We have found that excluding the NaNO3, increasing the amount of KMnO4, and performing the reaction in a 9:1 mixture of H2SO4/H3PO4 improves the efficiency of the oxidation process. This improved method provides a greater amount of hydrophilic oxidized graphene material as compared to Hummers' method or Hummers' method with additional KMnO4. Moreover, even though the GO produced by our method is more oxidized than that prepared by Hummers' method, when both are reduced in the same chamber with hydrazine, chemically converted graphene (CCG) produced from this new method is equivalent in its electrical conductivity. In contrast to Hummers' method, the new method does not generate toxic gas and the temperature is easily controlled. This improved synthesis of GO may be important for large-scale production of GO as well as the construction of devices composed of the subsequent CCG.
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