Abstract: This article reported a new method to synthesize Au nanoshell via carbon nanoparticle as the dielectric core. The carbon nanoparticles were prepared through hydrothermal reaction of glucose and Au seeds. This carbon nanoparticles inherit reactive surfaces which facilitate the loading of Ag nanoparticles, then the Ag nanoparticles act as the seeds for further reduction of chloroaurie acid in the presence of cetyltrimethyl ammonium bromide(CTAB) and ascorbic acid to form a complete Au nanoshell on the surface of carbon nanoparticles(carbon nanoparticle as the core and Au layer as the shell). Successful forming of complete Au nanoshell was approved by transmission electron microscopy(TEM) and UV-Vis absorption spectra. The Au nanoshell shows a strong absorption in the range of near-infrared(NIR). The experimental results indicate that this method is a facile and effective way for the synthesis of Au nanoshell with NIR absorption properties.

Key words: Carbon nanoparticles, Au nanoshell, Core-shell structure, Near-infrared absorption