Gold Nanoparticles from Oxonium Precursor:Synthesis in the Presence of Primary Amine and Characterization

摘要

A convenient method of the synthesis of gold NPs with low polydispersity is described.Triphosphinogold oxonium salt [O(AuPPh_3)_3]BF_4 in the presence of amine and dioxygen is a versatile gold atom source in mesitylene.The amine takes part in the reduction of gold(I)atom precursor.Therefore in a 1/1 Au(I)/hexadecylamine stechiometry,"naked"gold nanoparticles are produced which precipitate within some minutes from the solution and form a gold mirror.Only an excess of amine enables the synthesis of ligand-protected nanoparticles which furthermore display a great tendency to self-organize.Solvent effect on the course of the reaction is discussed.