Abstract
Ag–Au alloy nanoparticles with tunable size and composition wereprepared by a replacement reaction between Ag nanoparticles andHAuCl4 at elevated temperatures. The formation of homogeneous alloy nanoparticles was confirmedby selected-area energy-dispersive x-ray spectroscopy (SAEDX), UV–visible absorptionspectroscopy, high resolution transmission electron microscopy (HRTEM) and electrondiffraction. This method leverages upon the rapid interdiffusion of Ag and Au atoms in thereduced dimension of a nanoparticle, elevated temperatures and the large number ofvacancy defects created in the replacement reaction. This method of preparation hasseveral notable advantages: (1) independent tuning of the size and composition of alloynanoparticles; (2) production of alloy nanoparticles in high concentrations; (3) general utilityin the synthesis of alloy nanoparticles that cannot be obtained by the co-reductionmethod.
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