Non-covalent functionalization of graphene sheets by sulfonated polyaniline

Hua Bai, Yuxi Xu, Lu Zhao, Chun Li, Gaoquan Shi
2009 Chemical Communications  
Synthesis of Graphite Oxide (GO) Graphite oxide (GO) was synthesized from natural graphite powder by a modified Hummers method. 1, 2 Graphite powder (3 g, 325 mesh) was put into an 80 °C solution of concentrated H 2 SO 4 (12 mL), K 2 S 2 O 8 (2.5 g), and P 2 O 5 (2.5 g). Then, the mixture was kept at 80 °C for 4.5 h using an oil bath. Successively, it was cooled to room temperature and diluted with 0.5 L of de-ionized (DI) water and left overnight. The resulting product was filtered and washed
more » ... iltered and washed with DI water using a 0.2 micron Nylon Millipore filter to remove the residual acid and dried under ambient condition overnight. This pre-oxidized graphite was then subjected to oxidation by Hummers' method described as follows. Pretreated graphite powder was put into cold (0 °C) concentrated H 2 SO 4 (120 mL). Then, KMnO 4 (15 g) was added gradually under stirring and the temperature of the mixture was kept to be below 20 °C by cooling. Successively, the mixture was stirred at 35 °C for 2 h, and diluted with DI water (250 mL). Because the addition of water in concentrated sulfuric acid medium released a large amount of
doi:10.1039/b821805f pmid:19294256 fatcat:6wi63smxw5azpnoyw3agt4euly