We demonstrate the fabrication of Pt nanoparticles encapsulated in hollow carbon nanospheres using TiO2 nanoparticles as both the photocatalyst and the inorganic mold. These spheres were found to have high surface area and ultrathin shells with well-developed microporosity, leading to their availability as catalysts. The preparation technique provides a new imprinting method that can be used to synthesize any desired nanostructures using predesigned TiO2 photocatalysts, such as nanorod and orderedmesoporous forms of TiO2, 17] as core materials. Furthermore, the present concept should be applicable to other semiconductor photocatalysts and to fabrications of hollow carbon nanospheres including various metal nanoparticles other than Pt.
- titanium oxide,
- hollow carbon nanospheres
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