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SiO 2 -Ag core-shell nanostructure with silica core (SiO 2 ) and silver shell (Ag) nanoparticles with spherical morphology were successfully synthesized using a modified self-assembly sol-gel method. Ag nanoparticles at ca.10-50 nm were successfully attached on monodispersed silica spheres (SiO 2 ) with diameter of ca. 450 nm. Renewable resources of palm oil, derived fatty alcohols (octyl-alcohol (C8), decyl-alcohol (C10) and dodecyl-alcohol (C12)) were employed as nonsurfactant surface modifiers prior to coating with Ag nanoparticles. X-ray diffraction (XRD) patterns of calcined SiO 2 -Ag core-shell nanostructure prepared with surface modifiers exhibited amorphous structure of SiO 2  (core) and face-centered cubic (FCC) structure of metallic Ag nanoparticles (shell). The results obtained in the present work demonstrated the feasibility of employing fatty alcohols as potential nonsurfactant surface modifiers in synthesizing SiO 2 -Ag core-shell.

Synthesis and Characterizations of SiO<sub>2</sub>-Ag Core-Shell Nanostructure Using Fatty Alcohols as Surface Modifiers