In situ formation of gold nanoparticles within thiol functionalized HMS-C16 and SBA-15 type materials via an organometallic two-step approach

Using a two-step procedure based on (i) anchoring an organogold precursor within the channels of functionalized ordered mesoporous silica containing mercapto groups; (ii) followed by chemical reduction, we prepared materials containing gold (0) nanoparticles exclusively located within the pore channels. By modifying the organogold precursor/mercapto groups ratio, we demonstrate the necessity of the complexation of the organogold precursor prior to reduction. Using this methodology, gold content as high as 16.1 wt % with a narrow size distribution of nanoparticles regularly distributed within the pores of the material was achieved.