▎ 摘　　要

NOVELTY - Preparation and characterization of graphene/gold nanoparticle composite material involves cooling concentrated sulfuric acid, adding graphite powder, reacting, mixing, adding potassium permanganate slowly for 50-90 minutes, reacting, stirring, heating at 100 degrees C, adding hydrogen peroxide dropwise, precipitating, draining upper layer, adding hydrochloric acid solution, stirring, standing, precipitating, washing with deionized water, centrifuging, adjusting pH to greater than or equal to 5, vacuum drying, adding phosphate buffer, ultrasonic dispersing for 4-5 hours, centrifuging, and adding chloroauric acid solution. USE - Method for preparing and characterizing graphene/gold nanoparticle composite material. ADVANTAGE - The method is simple and environment-friendly. DETAILED DESCRIPTION - Preparation and characterization of graphene/gold nanoparticle composite material comprises cooling concentrated sulfuric acid, adding graphite powder, reacting, mixing, adding potassium permanganate slowly for 50-90 minutes, reacting, stirring, heating at 100 degrees C, adding hydrogen peroxide dropwise, precipitating, draining upper layer, adding hydrochloric acid solution, stirring, standing, precipitating, washing with deionized water, centrifuging, adjusting pH to greater than or equal to 5, vacuum drying, adding phosphate buffer, ultrasonic dispersing for 4-5 hours, centrifuging, adding chloroauric acid solution, mixing, electrodepositing, polishing with aluminum oxide paste, washing with deionized water, ultrasonic cleaning for 8-10 minutes, electrodepositing, characterizing by scanning electron microscopy, performing transmission electron microscopy, dispersing in ethanol, drying, and characterizing. Mass ratio of concentrated sulfuric acid, graphite powder and potassium permanganate is 36-40:1:2.5-4.