Continuous tuning the wetting growth of Au on Se nanoparticles

We show that the wetting growth of Au on Se seed nanoparticles can be continuously tuned through manipulating the growth kinetics - the reduction rate of HAuCl₄ and the inhibiting effect of DPI-SH ligand. As a result, a series of Se-Au hybrids and anisotropic Au semi-shell structures with different sizes were successfully obtained. With the structural variations, the absorptions of Se-Au hybrids and LSPRs of the Au semi-shells can be continuously tuned within the Visible-NIR spectral range. Our work provides convenient while efficient means for tailoring the Au-based heterostructures and the anisotropic Au nanostructures.