Facile synthesis of anisotropic Au@SiO2 core–shell nanostructures

Abstract

Anisotropic Au@SiO₂ core–shell nanostructures have been fabricated from CTABr-stabilized Au nanoparticles with a facile synthesis involving a single growth solution. This procedure circumvents tedious surface modification steps and allows for the SiO₂ shell thickness to be tuned from 5 to 20 nm by modulating the nanoparticle number density and concentration of silica precursor.