Highly dispersed gold nanoparticles assembled in mesoporous titania films of cubic configuration
- 作者：Yu Zhang ; Akhmad Herman Yuwono ; Jun Li ; John Wang
- 关键词：Mesoporous titania structure ; Gold nanoparticles ; Spatial confinement ; Surface plasmon resonance
- 刊名：Microporous and Mesoporous Materials
- 出版年：2008
- 期刊代码：78_13871811
- 类别：ch
- 出版时间：15 April 2008
- 卷：110
- 期：2-3
- 页码：242-249
- 文件大小：609 K
摘要
Highly dispersed Au nanoparticles (NPs) of average size of 9–12 nm were successfully assembled in mesopores of titania thin films, through H2-reduction of 
. The well organized mesoporous nanostructure was characterized by using small-angle X-ray scattering, transmission electron microscopy, scanning electron microscopy, X-ray diffraction, secondary ion mass spectroscopy and UV–vis spectrophotometry. Au NPs embedded in the mesoporous nanostructure exhibited enhanced thermal stability, up to 450 °C, which is attributed to the spatial confinement effect of the mesopores with cubic configuration. An obvious surface plasmon resonance was observed at 570 nm in the UV–vis absorption spectra of Au NPs embedded in the mesoporous thin films. The red shift and broadening of plasmon band observed for Au NPs are accounted for by the interaction between Au NPs and mesoporous titania framework. The mesoporous TiO2/Au nanocomposite films show optically allowed direct transition of titania, where the incorporation of Au NPs evidently reduces the bandgap of titania.