| 초록 |
Mesoporous silica (MS) with large pores (about 6 nm) and thiol functionalized mesoporous silica (TFMS) obtained by functionalization of 3-mercaptopropyltrimetoxysilane (MPTMS) were synthesized. 29Si MAS NMR, TG and FT-IR confirmed the functionalization of MPTMS on the surface of mesoporous silica, and the amount of silver loading on the TFMS in various concentrations of AgNO3 in aqueous solution was investigated. Silver nanoparticles were prepared by two methods: (1) direct reduction of Ag+ ions with NaBH4 in aqueous AgNO3 solution containing MS, (2) in situ reduction of Ag+ ions adsorbed on TFMS with NaBH4. The characteristics of products from both methods were compared using SAXRD, TEM, N2 adsorption-desorption and UV-vis absorption spectroscopy. Ag nanoclusters were mostly confined and dispersed in the channels of the TFMS and their sizes were under 6 nm. However, Ag nanoparticles on the MS formed outside the mesoporous channels rather than within them. |
