▎ 摘　　要

NOVELTY - The preparation method of metal nanoparticles involves (S1) ultrasonically dispersing graphene oxide in a proper amount of dimethylformamide solvent, adding trihydroxy methane, reacting at room temperature for 4-8 hours, washing the product, and drying to obtain a product graphene-hydroxide, (S2) ultrasonically dispersing graphene-hydroxide in dimethylformamide solvent, adding a small molecule with both a thiol group and a carboxyl group, and p-toluenesulfonic acid catalyst, heating, reacting to carry out esterification reaction, washing the product using nylon membrane filter, and drying to obtain product, introducing sulfhydryl group into the graphene oxide to prepare thiol-functionalized graphene, and (S3) ultrasonically dispersing the thiol-functionalized graphene in proper amount of deionized water, adding metal salt aqueous solution and reducing agent, stirring, filtering and drying. USE - Preparation method of metal nanoparticles used in molecular device, chemical/biosensor, catalytic application, and optoelectronic material. ADVANTAGE - The method enables preparation of metal nanoparticles with particle diameter of less than 30 nm and without agglomeration. DETAILED DESCRIPTION - The preparation method of metal nanoparticles involves (S1) ultrasonically dispersing graphene oxide as a template in a proper amount of dimethylformamide solvent, adding trihydroxy methane, reacting at room temperature for 4-8 hours, washing the product using a nylon membrane filter, and drying to obtain a product graphene-hydroxide, (S2) ultrasonically dispersing graphene-hydroxide in proper amount of dimethylformamide solvent, adding a small molecule with both a thiol group and a carboxyl group, and a proper amount of p-toluenesulfonic acid catalyst, heating at 90-100 degrees C, reacting for 5-10 hours to carry out esterification reaction, washing the product using nylon membrane filter, and drying to obtain product, introducing sulfhydryl group into the graphene oxide to prepare thiol-functionalized graphene, and (S3) ultrasonically dispersing the thiol-functionalized graphene in proper amount of deionized water, adding metal salt aqueous solution with concentration of 0.1 g/ml and reducing agent, stirring the mixture at room temperature overnight, filtering and drying.