| 초록 |
Anisotropic plasmonic gold nanoparticle such as gold nanorods (Au NRs) and bipyramids (Au BPs) have attracted a great deal of recent interest due to their unique optical properties. Especially, strong electromagnetic field enhancement of the plasmonic nanoparticles is useful for surface enhanced Raman scattering (SERS) which has been applied for chemical analysis or molecular detection. In addition, silicon has become a material of significant interest due to their unique optoelectronic properties, biocompatibility for bioimaging. Here, we have fabricated Si-Au core/shell nanoparticles using Au NRs and Au BPs. First, Au NRs and Au BPs were synthesized by a seed-mediated method and silica is subsequently overcoated onto surface of gold nanoparticles with cetyltrimethylammonium bromide by adding tetraethoxysilane. Next, the silica layer is replaced to silicon by reduction using magnesium powder. We analyzed the core-shell nanoparticle using SEM, TEM, UV-Visible and Raman spectroscopy. |
