| 초록 |
The immobilization of gold nanoparticls onto the silica surface was carried out by chemical reduction process. Amino groups (-NH2) were used to bind the gold nanoparticles onto the silica surface. Ethanol/water mixture was used as a solvent. The resultant particles of these reductions were characterized through transmission electron microscopy and UV-vis. spectroscopy. The size of immobilized gold nanoparticle was controlled by the variation of PVP concentrations ( 0.1 wt%, 0.2wt% 0.3wt% and 0.5 wt% ) using short polyvinyl chained PVP (M.W.=10,000) and PVP molecular weights (M.W.= 10,000, 29,000, 40,000 and 58,000) when sodium hydroxide was used as reducing agent. On basis of the experimental results, the influence of PVP concentration, PVP molecular weight and the concentration of reducing agent upon the formation of gold-silica heterogeneous nanocomposite particles were discussed. |
