Synthesis and Characterizations of Monodispersed Nanotriangle of Gold

摘要

Monodispersed nanotriangles of gold have been prepared by a simple reaction between HAuCl_4·4H_2O, KOH and NH_2OH·HCl in the presence of gelatin. Gelatin played a decisive role as an inhibitor of the direct reaction of NH_2OH with AuCl_4- and coagulation of the growing gold in producing the triangle. In the absence of gelatin, we can only obtain irregular large gold particles. The products were characterized by X-ray powder diffraction, transmission electron microscopy and UV-visible absorption spectroscopy.