Facile Synthesis of Pd−Cu Bimetallic Twin Nanocubes and a Mechanistic Understanding of the Shape Evolution
Facile Synthesis of Pd−Cu Bimetallic Twin Nanocubes and a Mechanistic Understanding of the Shape Evolution
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DOI：
10.1002/cnma.201900653
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发表时间：
2020-03
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影响因子：
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通讯作者：
Yifeng Shi;Zhiheng Lyu;J. Liu;Emily Chase;Younan Xia
中科院分区：
文献类型：
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作者：
Yifeng Shi;Zhiheng Lyu;J. Liu;Emily Chase;Younan Xia
本文介绍了一种简便的铜孪晶立方的合成方法，产率约为. 70%，来自基于钯六方纳米片的种子。晶格失配，盖帽剂，和种子中的平面缺陷的数量都发挥重要作用，在指导Pd种子上的Cu的形状演变。最初，Cu原子仅以小岛的形式沉积在Pd纳米片的两个基面之一上。随着生长的继续，Cu {100}面在十六烷基胺和Cl-的存在下发展，这两种封端剂对Cu（100）表面具有选择性。当切换到Pd三角形纳米片时，获得Cu右双锥而不是立方体，并且从种子的每一侧仅产生三个{100}面。原子分辨率透射电子显微镜分析表明，晶种类型与最终产品形状之间的对应关系可归因于沿板状晶种垂直方向沿着的平面缺陷数量，其中两个和一个孪晶面分别对应于立方体和右双锥。通过调整实验条件，这种合成方法也可以推广到Pd-Ag和其他双金属体系。
This paper presents a facile synthesis of Cu twin cubes, with a yield ofca. 70%, from seeds based on Pd hexagonal nanoplates. The lattice mismatch, capping agent, and number of planar defects in the seeds all play important roles in directing the shape evolution of Cu on the Pd seeds. Initially, the Cu atoms are only deposited on one of the two basal planes of a Pd nanoplate in the form of small islands. As the growth continues, Cu {100} facets developed in the presence of hexadecylamine and Cl−, two capping agents with selectivity towards the Cu(100) surface. When switched to Pd triangular nanoplates, Cu right bipyramids instead of cubes are obtained and only three {100} facets are created from each side of the seed. Atomic‐resolution transmission electron microscopy analysis indicates that the correspondence between the type of the seed and the shape of the final product can be attributed to the number of planar defects along the vertical direction of the plate‐like seed, with two and one twin planes corresponding to cube and right bipyramid, respectively. By adjusting the experimental condition, this synthetic method can also be extended to Pd−Ag and other bimetallic systems.