▎ 摘　　要

NOVELTY - Preparation of carboxylic graphene oxide/L-tyrosine nano composite comprises ultrasonically dispersing carboxylic graphene oxide in water, adding L-tyrosine, mixing, regulating pH to more than 2.2, heating, refluxing mixed solution, filtering and washing product to neutral, and drying to obtain carboxylic graphene oxide/L-tyrosine nano composite. USE - Method of preparation of carboxylic graphene oxide/L-tyrosine nano composite (claimed) used for preparing functional nano filler of biomedical product. ADVANTAGE - The method controls absorption of protein on material surface through chirality of L-tyrosine.