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>2</sub>PtCl<sub>6</sub> with trisodium citrate as reductant.
The self-assembled SiO<sub>2</sub>@Pt@SiO<sub>2</sub> spheres were
stuck together and etched through the “surface-protected etching”
strategy. Many vertically aligned silica branches <i>in situ</i> grew from the inlaid SiO<sub>2</sub>@Pt@SiO<sub>2</sub> 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>4</sub>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>2</sub> 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
