| Abstract
| - The aqueous-phase synthesis of icosahedral gold nanoparticles with controlled diameters ranging from 10 to90 nm is reported. The nanoparticles were prepared by a seed-mediated growth approach. Citrate-capped 3.5nm gold nanoparticles, prepared by reduction of HAuCl4 with sodium borohydride, are used as seeds.Cetyltrimethylammonium bromide molecules served as a capping agent to restrict the nanoparticles size. Thesynthesized gold nanoparticles were characterized by UV−vis spectroscopy, transmission electron microscopy(TEM), scanning electron microscopy, and X-ray diffraction (XRD). The crystal structure of the particleswas found to consist of mostly {111} surfaces as revealed by both TEM and XRD results. The preparedicosahedral gold nanoparticles show efficient surface-enhanced Raman scattering properties.
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