Facile Synthesis of Pd−Cu Bimetallic Twin Nanocubes and a Mechanistic Understanding of the Shape Evolution,ChemNanoMat

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Facile Synthesis of Pd−Cu Bimetallic Twin Nanocubes and a Mechanistic Understanding of the Shape Evolution
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-01-16 , DOI: 10.1002/cnma.201900653
Yifeng Shi ₁ , Zhiheng Lyu ₂ , Jingyue Liu ₃ , Emily Chase ₄ , Younan Xia _{1,

2,

5}

Affiliation

This paper presents a facile synthesis of Cu twin cubes, with a yield of ca. 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.

中文翻译：

Pd-Cu双金属双纳米立方的简便合成和形状演变的机理理解

本文呈现的Cu双立方体的简便合成，具有的屈服CA。70％来自基于Pd六角形纳米板的种子。晶种的晶格失配，封端剂和平面缺陷的数量均在指导Cu在Pd晶种上的形状演变中起着重要作用。最初，Cu原子仅以小岛的形式沉积在Pd纳米板的两个基面之一上。作为生长继续，铜{100}面中的十六烷基胺和Cl的存在下开发的^-，两种对Cu（100）表面具有选择性的封端剂。当切换到Pd三角形纳米板时，获得的是Cu右双锥而不是立方体，并且从种子的每一侧仅创建了三个{100}切面。原子分辨率透射电子显微镜分析表明，种子类型与最终产品形状之间的对应关系可归因于沿板状种子垂直方向具有两个和一个双晶面的平面缺陷的数量分别对应于立方和右双锥。通过调整实验条件，该合成方法还可以扩展到Pd-Ag和其他双金属系统。

更新日期：2020-01-16

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