▎ 摘　　要

NOVELTY - Preparing grained graphene-betaine nano complex material comprises: (i) carrying out surface modification of graphene oxide by silane coupling agent; (ii) mixing of silane coupling agent modified graphene with organic solvent, carrying out ultrasonic treatment to disperse evenly to obtain silane coupling agent-modified dispersion of graphene oxide; and (iii) grafting dodecyl betaine onto silane coupling agent-modified graphene oxide to obtain oxide graphene-betaine nano complex material. USE - The method is useful for preparing grained graphene-betaine nano complex material (claimed). ADVANTAGE - The material has high surface activity, high stability and strong biocompatibility. The method is environmentally friendly and has mild reaction condition.