Abstract
Silica-coated anisotropic gold nanoparticles(Au@SiO2), including rod- and ‘dogbone’-like outlines with different aspect ratios,have been prepared using an improved Stöber method. The obtainedAu@SiO2 have a pure silica surface for straightforward and rapid self-assembly ontopoly(4-vinylpyridine) (PVP) functionalized quartz substrates. The large-scale assembliesexhibit highly reversible optical changes that can be observed spectroscopically or with thenaked eye when repeatedly cycled between a dry and wet process. The relationship amongthe optical properties of two-dimensional assemblies, the aspect ratio and shape of thegold nanoparticles and the environmental refractive index is also investigated.
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