Two- and Three-Dimensional Ordered Structures of Hollow Silver Spheres Prepared by Colloidal Crystal Templating

摘要

Much attention has been focused recently on the preparation of macroporous materials by templating with colloidal crystals. This interest stems from the important properties of such microstructures, which have a wide range of applications including sensors, catalysts, and photonic crystals. Various macroporous and mesoporous materials have been made via this process, including ceramics, carbon, chalcogen-ides, NaCl,pl polymers, and silica-gold. The extension of such a material patterning method to metals is particularly attractive, as metals with ordered microstructures exhibit unique optical, electrical, magnetic, and catalytic properties. For example, surface enhancement of Raman scattering in porous gold films has been demonstrated by Tessire et al. In a recent study, Baumberg and coworkers reported the observation of confined plasmons in gold nanocavities.