Self-assembling of gold nanoparticles with silica coverage size-controlled by sodium silicate

Abstract

Using heat-reduction method, we fabricated gold nanoparticles. And then, the particles were coated with silica whose shell thickness was controlled by tetramethoxysilane (TMOS). A hydroxylated glass substrate was dipped in a poly(diallyldimethylammoniumchloride)(PDDA) solution and then immersed into silica coated gold sol, which as a result was self-assembled on the glass.