Preparation method of gold nanoparticles

The invention belongs to the technical field of materials chemistry, and specifically discloses a Preparation method of gold nanoparticles. The preparation method comprises the following steps of: preparing poly4-vinylpyridine, mixing the poly4-vinylpyridine and 1-bromobutane, adding trichloromethane into the mixed system of the poly4-vinylpyridine and the 1-bromobutane, filtering the mixture, preparing the obtained solid into ionic polymer solution after vacuum drying, dropping HauCl4 solution into the ionic polymer solution to obtain a reaction solution, adding NaBH4 solution into the reaction solution after mixing the reaction solution for 6 hours until the reaction solution changes to purple red, pouring the reaction solution into a dialysis bag, and dialyzing the reaction solution in deionized water to obtain solid gold nanoparticles. The gold nanoparticles prepared by the method provided by the invention have the advantages of regularity in shapes, uniformity in particle diameters, no easy for aggregation, higher catalytic activity and low pollution to environment.