PPT Slide
Grow silica cores using St–ber method (basic reduction of tetraethoxysilane in ethanol).
Coat with amino propyl triethoxysilane to terminate the surface of the nanoparticle with amine groups.
Immerse amine coated silica particles into a bath of small gold colloid (< 2 nm).
Reduce more gold onto seed particles until particles coalesce into a complete shell.
S. J. Oldenburg, R. D. Averitt, S. L. Westcott, and N. J. Halas, Chem. Phys. Lett. 288, 243-247 (1998).