Supporting Information Preparation of graphene oxide Graphite oxide was synthesized from natural graphite flakes by Staudenmaier method. Briefly, natural graphite (5 g) was added into a mixture of 87.5 ml concentrated sulfuric acid and 45 ml concentrated nitric acid in a 500ml three neck flask at 0 oC. KClO3 (55 g) was slowly added in 11 portions to keep the temperature below 5 oC. After a reaction time of 96 h at room temperature, the suspension was centrifuged and washed with plenty of deionized water until pH ≈ 7. Graphene oxide (GO) was prepared by exfoliating graphite oxide in deionized water with the aid of ultrasonication using a JY99-2 DN ultrasonicator (Ningbo, China).
Figure S1. AFM image (a) and section analysis (b) of as-exfoliated GO suspension.
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Scheme S1. A simple model based on amination of the epoxide group of GO for the insertion of the PPD in the intra-gallery of GO.
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