Deposition of highly dispersed gold nanoparticles onto metal phosphates by deposition-precipitation with aqueous ammonia

摘要

An efficient method for depositing gold nanoparticles onto metal phosphate has been developed. Deposition-precipitation with aqueous ammonia enabled small gold nanoparticles to be deposited onto a series of metal phosphates with high dispersity and density. A detailed investigation of the mechanism of the formation of gold nanoparticles corroborated that strong interaction between a gold-ammine complex formed by the treatment of HAuCl4 with ammonia and positively-charged metal phosphates was responsible for the formation of highly dispersed gold nanoparticles. Furthermore, the thus-prepared gold catalysts supported on metal phosphates showed higher catalytic activity than those supported on metal oxides for the hydroamination of terminal alkynes.