Processing and manipulation of highly conductive pristine graphene in large quantities are still major challenges in the practical application of graphene for electric device. In the present study, we report the liquid-phase exfoliation of graphite in toluene using well-defined poly(3-hexylthiophene) (P3HT) to produce a P3HT/graphene composite. We synthesize and use regioregular P3HT with controlled molecular weights as conductive dispersants for graphene. Simple ultrasonication of graphite flakes with the P3HT successfully produces single-layer and few-layer graphene sheets dispersed in toluene. The produced P3HT/graphene composite can be used as conductive graphene ink, indicating that the P3HT/graphene composite has high electrical conductivity owing to the high conductivity of P3HT and graphene. The P3HT/graphene composite also works as an oxidation-resistant and conductive film for a copper substrate, which is due to the high gas-barrier property of graphene.

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A novel degradable polyanion, poly(phthalic ethylene glycol ester), was synthesized in one pot in a single step. The degradable polyanion assembles with various polycations to form layer-by-layer films that can encapsulate physiologically active biomolecules. Polyanion degradation can induce film disassembly and release of the encapsulated functional protein.

A graphene surface is functionalized with a polymerizable surfactant by in situ polymerization for the stable colloidal dispersion of graphene.