Synthesis of raspberry-like particles using polyelectrolyte multilayer-coated particles

Abstract

The formation of raspberry particles from polyelectrolyte multilayer-modified particles is described. This synthesis represents a new use for polyelectrolyte multilayers as nanoscale-thick reaction vessels for the immobilization and reaction of inorganic reagents. The dissolution of Au nanoparticles inside PEM layers that are capped with a SiO₂ layer leads to the hydrolysis and subsequent redeposition of SiO₂ nanoparticles. The size of these particles is in the 200 nm range and their loading can be controlled by adding various amounts of Au nanoparticles to the PEMs.