Graphite oxide (GO) 1 possesses a large amount of acidic hydroxyl groups on its layer 2 and they react with silylating reagents 3, forming stable intercalation compounds. The resulting materials are hydrophobic and soluble in organic solvents, giving colloid so called nanosheet solution in which individual layers of them are believed to be separated with each other. It is possible to obtain thin film samples by spin coating or casting the resulting solution. These films are available for the matrices of photo-functional organic molecules 4 and are also expected to be used for the precursor of composite carbon film containing foreign atoms by heat treatment.
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