Palladium shell of ~11 to 15 nm thickness has been synthesized successfully by reduction of surface bound palladium ions onto ~200 nm diameter silica core. The method for generating such nanoshells is based on seed-mediated growth technique. Palladium ions from complex palladium salt are adsorbed onto aminosilane functionalized silica core and subsequently reduce to create in situ palladium nanoparticle seeds. These nanoparticle seeds act as the nucleation sites to promote further growth of final palladium overlayer. Palladium nanoparticle seeds generated onto the functionalized silica surface are ~3 nm in diameter and are uniformly distributed throughout the core surface as observed by transmission electron microscopy (TEM). The thickness of the final palladium shell can be tailored by varying the concentration of the seeded core during the shell formation step. This present method reports the first time synthesis of palladium nanoshell from surface bound palladium nanoparticles seeds compare to earlier reports that use gold nanoparticles as seed to generate final palladium shell. In addition to palladium nanoshells, the current study involves synthesis of gold nanoshells on silica cores that are less than 100 nm diameter using the same method of making palladium nanoshells. Previous work has shown the successful synthesis of gold nanoshell on a 200 nm silica core using the present seed mediated synthesis procedure. Gold nanoshells with a smaller core may find increased application in photo-thermal therapeutic studies.

Synthesis of gold nanoshell with less than 100 nm diameter and palladium nanoshell on silica core using in situ generated metal nanoparticle seeds

248th National Meeting (2014)

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