▎ 摘　　要

NOVELTY - Graphene oxide/silver/polydopamine (GO/Ag/PDA) nanocomposite particle comprises graphene oxide, silver and polydopamine in a ratio of 0.5-50:10.8-108:100-300, particle size is 10-100 nanometer, the wear scar diameter is 0.35-0.60 mm, and the friction coefficient is 0.40-0.67. USE - GO/Ag/PDA nanocomposite particle used as an additive in lubricating oil (claimed). ADVANTAGE - The GO/Ag/PDA nanocomposite particle has good tribological properties, the nanoparticles are uniformly dispersed, the reaction medium is water-green and environmentally friendly, and is carried out at normal temperature and pressure, the reaction involved in the method is mild and the preparation efficiency is high, and the synthesis and modification are completed in one step, and the finished product can be directly used as an additive in lubricating oil, which is convenient for industrialization and application. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of GO/Ag/PDA nanocomposite particle, which involves using tris-hydrogen chloride (Tris-HCl) buffer solution as reaction medium, adding graphene oxide solution, silver ammonia solution, dopamine powder and oleic acid successively under magnetic stirring, reacting for a certain period of time under stirring to obtain semi-finished product viscous after demulsification with absolute ethanol solid, and centrifuging and washing semi-finished viscous solid with ethanol and deionized water, and then centrifuging and drying to obtain the target product.