Hofer Corinne J, Grass Robert N, Schneider Elia M, Hendriks Lyndsey, Herzog Antoine F, Zeltner Martin, Günther Detlef, Stark Wendelin J
Institute for Chemical and Bioengineering , ETH Zurich , Vladimir-Prelog-Weg 1 , 8093 Zurich , Switzerland . Email:
Laboratory of Inorganic Chemistry , ETH Zurich , Vladimir-Prelog-Weg 1 , 8093 Zurich , Switzerland.
Chem Sci. 2017 Oct 30;9(2):362-367. doi: 10.1039/c7sc03785f. eCollection 2018 Jan 14.
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 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.
金属纳米颗粒的选择性脱合金化产生了包裹铂纳米颗粒的拨浪鼓型中空碳纳米壳，这些纳米壳能够进行尺寸选择性催化。外层类石墨烯碳表面的选择性功能化可防止团聚，并导致在水溶液中具有良好分散性的纳米催化剂。合成过程始于通过还原火焰喷雾合成法制备具有钴 - 铂合金核且被类石墨烯碳包围的纳米颗粒。表面功能化后，壳壁同时形成孔隙以及钴的溶解导致铂被封装在中空碳纳米球中。对不同尺寸的糖类（葡萄糖和麦芽七糖）进行催化氧化揭示了这些铂纳米拨浪鼓的尺寸选择性催化特性。
