The morphology and size of nanostructured Au in Au/SBA-15 affected by preparation conditions |
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| Affiliation: | Department of Chemistry, National Tsinghua University, Hsinchu, Taiwan;Department of Chemical Sciences, University of Catania, Viale A.Doria 6, 95125 Catania, Italy;University of Lund, Solid State Physics, Box 118, S-221 00 Lund, Sweden;Institut fuer Angewandte Physik, Halbleiterphysik, TU Dresden, D-01062 Dresden, Germany;Department of Chemistry & CSGI, room 295, University of Florence, via della Lastruccia 3, Sesto Fiorentino, 50019 Florence, Italy |
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| Abstract: | Template-free mesoporous silica SBA-15 was reacted with TPTAC to generate positively charged functional groups PTA+ on the pore surface. Through ion exchange, a uniform distribution of anionic metal complexes on the intrachannel surface of host silica was achieved. In this study, ethanol and water were used as solvent for HAuCl4 precursor solutions impregnated on SBA-15 mesoporous silica. The solvent used can affect the size and location of the resulting nanoparticles. Large Au nanoparticles (15–43 nm) were found on the as-prepared Au/SBA-15 as observed by PXRD, XAS, UV–vis and TEM. This may have originated through Si–OH reduction of chloroaurate complexes generated in the aqueous solution of HAuCl4, and such particles were not present when ethanolic solution was used. After NaBH4 and H2 reduction, the average size of Au nanoparticles, which was incorporated into the channels of SBA-15, was found to be limited to ≤ 7 nm. |
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