Fabrication of Nanoscale Cage Cubes by Drilling Orthogonal, Intersected Holes through All Six Side Faces of Ag Nanocubes
Fabrication of Nanoscale Cage Cubes by Drilling Orthogonal, Intersected Holes through All Six Side Faces of Ag Nanocubes
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DOI：
10.1021/acs.chemmater.9b03774
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发表时间：
2019-10
影响因子：
8.6
通讯作者：
Jaewan Ahn;D. Qin
中科院分区：
文献类型：
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作者：
Jaewan Ahn;D. Qin
我们报告了一种基于电替代的通用方法，通过将Ag的钻孔限制在Ag - au合金框架包裹的Ag纳米立方体的每个侧面的中心，来制造纳米尺度的多金属笼状立方体。在一个典型的过程中，我们将Ag@Ag -Au核框架纳米立方体分散在十六烷基三甲基氯化铵的水溶液中，然后在环境条件下滴定前驱体的水溶液。我们发现，银的氧化优先由位于纳米立方体每侧表面中心的银主导区域引发，以形成空腔，而由此产生的金属原子以正交的方式沉积在边缘和角落。在H2PtCl6前驱体的情况下，Ag原子将以Ag(I)离子的形式从侧面剥离，从而产生数量少得多的Pt原子。因为一层薄薄的Ag-Au-Pt合金倾向于在表面形成，包括空洞周围而不是空洞内部的区域，所以……
We report a general method based on the galvanic replacement for the fabrication of nanoscale, multimetallic, cage cubes by confining the drilling of Ag to the center of each side face of a Ag nanocube encased by Ag–Au alloy frames. In a typical process, we disperse Ag@Ag–Au core–frame nanocubes in an aqueous solution of cetyltrimethylammonium chloride, followed by the titration of an aqueous solution of the precursor under ambient conditions. We identify that the oxidation of Ag is preferentially instigated from the Ag-dominated regions located at the center of each side face of a nanocube for the creation of a cavity, while the resultant metal atoms are deposited on the edges and corners in an orthogonal manner. In the case of H2PtCl6 precursor, Ag atoms will be carved away from the side faces in the form of Ag(I) ions for the generation of a much smaller number of Pt atoms. Because a thin layer of Ag–Au–Pt alloy tends to be formed on the surface, including the areas around but not inside the cavities, ...