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Shape-controlled Synthesis Of Pd Nanocrystals In Aqueous Solutions

机译：水溶液中钯纳米晶的形控合成

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This article provides an overview of recent developments regarding synthesis of Pd nanocrystals with well-controlled shapes in aqueous solutions. In a solution-phase synthesis, the final shape taken by a nanocrystal is determined by the twin structures of seeds and the growth rates of different crystallographic facets. Here, the maneuvering of these factors in an aqueous system to achieve shape control for Pd nanocrystals is discussed. L-ascorbic acid, citric acid, and poly(vinyl pyrrolidone) are tested for manipulating the reduction kinetics, with citric acid and Br ions used as capping agents to selectively promote the formation of {111} and {100} facets, respectively. The distribution of single-crystal versus multiple-twinned seeds can be further manipulated by employing or blocking oxidative etching. The shapes obtained for the Pd nanocrystals include truncated octahedron, icosahedron, octahedron, decahedron, hexagonal and triangular plates, rectangular bar, and cube. The ability to control the shape of Pd nanocrystals provides a great opportunity to systematically investigate their catalytic, electrical, and plasmonic properties.
机译：本文概述了有关水溶液中具有良好控制形状的Pd纳米晶体合成的最新进展。在固溶相合成中，纳米晶的最终形状由晶种的孪生结构和不同晶体学小面的生长速率决定。在这里，讨论了在水系统中操纵这些因素以实现对Pd纳米晶体的形状控制。测试了L-抗坏血酸，柠檬酸和聚乙烯吡咯烷酮的还原动力学，柠檬酸和Br离子分别用作封端剂，分别选择性促进{111}和{100}晶面的形成。单晶和多晶种子的分布可以通过采用或阻止氧化蚀刻来进一步控制。 Pd纳米晶体的形状包括截短的八面体，二十面体，八面体，十面体，六边形和三角形板，矩形棒和立方体。控制Pd纳米晶体形状的能力为系统研究其催化，电和等离激元性质提供了巨大的机会。

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