▎ 摘　　要

NOVELTY - Preparing water-dispersible conductive graphene comprises e.g. (i) preparing surface-carboxylated graphene oxide powder, (ii) taking carboxylated oxide graphene ultrasonic to dispersing into 100 ml of water, adding N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide, then ultrasound, adding polyethylenimine, centrifuging and washing to obtain functionalized graphene oxide (GO-PEI), and (iii) redispersing functionalized graphene oxide in deionized water and reducing with reducing agent to obtain became dark black, centrifuging, washing, freezing and drying. USE - The method is useful for preparing water-dispersible conductive graphene (claimed). ADVANTAGE - The water-dispersible conductive graphene has good stability. DETAILED DESCRIPTION - Preparing water-dispersible conductive graphene comprises (i) adding sodium hydroxide and sodium chloroacetate into suspension of 100 ml of graphene oxide (concentration 1 mg/ml) under water bath for certain period of time, then resulting clear solution, neutralizing by dilute hydrochloric acid and, and then re-centrifuging with deionized water to neutral, freezing and drying to obtain surface-carboxylated graphene oxide powder, (ii) taking carboxylated oxide graphene ultrasonic to dispersing into 100ml of water, and then adding N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide, then ultrasound for certain period of time, then adding polyethylenimine at room temperature stirring reaction, centrifuging and washing the precipitate with ultrapure water to obtain functionalized graphene oxide GO-PEI, (iii) redispersing functionalized graphene oxide in deionized water and reducing with 1 g reducing agent for 24 hours at a certain temperature to obtain became dark black, then centrifuging, washing by distilled water, then freezing and drying to obtain functionalized graphene-polyethylenimine (GR-PEI).