▎ 摘　　要

NOVELTY - Graphene oxide film with high modulus and strength comprises 100 pts. wt. graphene oxide, 0.01-100 pts. wt. catechol containing surface-treatment agent, 0.01-200 pts. wt. crosslinking agent and other auxiliary agents. The film is a macroscopic film. USE - The graphene oxide film is useful in e.g. packaging and super capacitors. ADVANTAGE - The method utilizes easily available, low cost and high biocompatibility graphene oxide, which reinforces the mechanical property of film. The film has high electrical and thermal conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene oxide film, comprising (a) dispersing graphene oxide made of expanded graphite, (b) dispersing with catechol surface treatment agent, (c) processing polyethylene glycol-grafted graphene oxide (PGO) with neutral pH buffering agent to obtain crosslinked PGO-polyethylenimine (PEI) composite film, and (d) crosslinking to obtain enhanced graphene oxide film under the alkaline buffer solution.