Self-Assembly Hierarchical Silica Nanotubes with Vertically Aligned Silica Nanorods and Embedded Platinum Nanoparticles

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• 作者：Chao ZhangYuming Zhou ; Yiwei Zhang ; Shuo Zhao ; Jiasheng Fang ; Xiaoli Sheng ; Hongxing Zhang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2017
• 出版时间：February 6, 2017
• 年：2017
• 卷：5
• 期：2
• 页码：1578-1585
• 全文大小：632K
• ISSN：2168-0485

文摘

We report a simple method for the fabrication of hierarchical silica-Pt nanotubes. In the system, initial Pt NPs can be obtained via the reduction of H<sub>2sub>PtCl<sub>6sub> with trisodium citrate as reductant. The self-assembled SiO<sub>2sub>@Pt@SiO<sub>2sub> spheres were stuck together and etched through the “surface-protected etching” strategy. Many vertically aligned silica branches in situ grew from the inlaid SiO<sub>2sub>@Pt@SiO<sub>2sub> spheres, fabricating the hierarchical silica-Pt nanotubes automatically. TEM and SEM were conducted to monitor the morphological evolution. The effects of the PVP concentration and molar ratios of NH<sub>4sub>OH to TEOS have also been investigated with a series of contrast experiments. Furthermore, in this work, several potential applications of HSNs have been investigated, such as the synthesis of Pt-CeO<sub>2sub> nanotubes and other single or double metal nanotubes. Besides, the hierarchical silica-Pt nanotubes exhibited a high thermal stability and excellent catalytic performance in the reaction of propane dehydrogenation, suggesting their potential application in various high-temperature reactions.