Abstract
Co-digestive ripening of two distinct metal nanoparticles is an exceptional method for the colloidal synthesis of core–shell heterostructures. In this report, a detailed investigation of the underlying mechanism by which surfactant molecule assisted interatomic transfer between two metal nanoparticles occurs has been described using gold/silver as a model system. Core–shell nanoparticles with gold in the core and silver in the shell in the size regime of 6.9 ± 1.8 nm were obtained by conducting the codigestive ripening of polydispersed particles of Au–pentanone and Ag–pentanone colloids in the presence of hexadecylamine as a capping agent used in the molar ratio of 1:30 with respect to metal. The progress of the formation of core–shell nanoparticles has been monitored using UV–visible spectroscopy and transmission electron microscopy. Detailed analysis of the nature of Au@Ag core–shell nanoparticles has been done with the help of HAADF-STEM technique, point-EDS analysis, elemental line scanning technique,...
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