▎ 摘　　要

Amphiphilic functionalization of graphene oxide(GO) is of the essence for its biomedical applications. TWEEN 80-grafted GO was synthesized by a two-step approach. In step 1, GO surface was activated with hexamethylene diisocyanate(HMDI) through a reaction between GO carboxyl or hydroxyl groups and isocyanate. HMDI-activated GO was then grafted by TWEEN 80 in step 2, resulting in amphiphilic GO nanosheets. The fabricated TWEEN 80-grafted GO exhibited excellent dispersibility in various solvents, such as water, chloroform and n-hexane. Furthermore, PC12 and HeLa cells were cultured on TWEEN 80-grafted GO film to assess its cytotoxicity. Cell morphology analysis and cell viability assay(Calcein AM &EthD-1 staining and MTT assay) indicated that the as-synthesized amphiphilic GO had good biocompatibility.