Selective dealloying of metal nanoparticles results in rattle-type hollow carbon nanoshells enclosing platinum nanoparticles, which are able to perform size-selective catalysis. Selective functionalization of the outer graphene-like carbon surface prevents agglomeration and leads to well dispersible nanocatalysts in aqueous solutions. The synthesis starts with the production of nanoparticles with a cobalt–platinum-alloy core surrounded by graphene-like carbon via reducing flame spray synthesis. After surface functionalization, simultaneous pore formation in the shell-wall and dissolution of the cobalt results in platinum encapsulated in hollow carbon nanospheres. Catalytic oxidation of differently sized sugars (glucose and maltoheptaose) reveales size-selective catalytic properties of these platinum nanorattles.

中文翻译：

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水分散性表面官能化铂/碳纳米nano用于尺寸选择催化

金属纳米颗粒的选择性脱合金化导致嘎嘎声型空心碳纳米壳包围铂纳米颗粒，该铂壳能够进行尺寸选择催化。外部石墨烯状碳表面的选择性官能化可防止团聚，并导致纳米催化剂在水溶液中具有良好的分散性。合成开始于生产具有钴-铂合金芯且被石墨烯状碳包围的纳米颗粒，通过减少火焰喷射的合成。表面官能化后，同时在壳壁中形成孔并溶解钴，导致铂包封在空心碳纳米球中。不同大小的糖（葡萄糖和麦芽七糖）的催化氧化揭示了这些铂纳米ra的大小选择性催化特性。