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首页> 外文期刊>Chemistry: A European journal >Synthesis and characterization of Pd@M_xCu_(1-x) (M=Au, Pd, and Pt) nanocages with porous walls and a yolk-shell structure through galvanic replacement reactions
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Synthesis and characterization of Pd@M_xCu_(1-x) (M=Au, Pd, and Pt) nanocages with porous walls and a yolk-shell structure through galvanic replacement reactions

机译：Pd @ M_xCu_（1-x）（M = Au，Pd和Pt）纳米笼的合成和表征，这些笼具有多孔壁和卵黄壳结构，通过电流置换反应

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摘要

This paper describes the synthesis of Pd@M_xCu_(1-x) (M=Au, Pd, and Pt) nanocages with a yolk-shell structure through galvanic replacement reactions that involve Pd@Cu core-shell nanocubes as sacrificial templates and ethylene glycol as the solvent. Compared with the most commonly used templates based on Ag, Cu offers a much lower reduction potential (0.34 versus 0.80 V), making the galvanic reaction more easily to conduct, even at room temperature. Our structural and compositional characterizations indicated that the products were hollow inside, and each one of them contained porous M-Cu alloy walls and a Pd cube in the interior. For the Pd@Au_xCu _(1-x) yolk-shell nanocages, they displayed broad extinction peaks extending from the visible to the near-IR region. Our mechanistic study revealed that the dissolution of the Cu shell preferred to start from the slightly truncated corners and then progressed toward the interior, because the Cu {100} side faces were protected by a surface capping layer of hexadecylamine. This galvanic approach can also be extended to generating other hollow metal nanostructures by using different combinations of Cu nanostructures and salt precursors.
机译：本文介绍了通过电置换反应合成具有卵黄壳结构的Pd @ M_xCu_（1-x）（M = Au，Pd和Pt）纳米笼的方法，该反应涉及Pd @ Cu核壳纳米立方体作为牺牲模板和乙二醇作为溶剂。与最常用的基于Ag的模板相比，Cu的还原电位要低得多（0.34对0.80 V），即使在室温下，电反应也更易于进行。我们的结构和成分表征表明，产品内部是中空的，每个产品内部均包含多孔M-Cu合金壁和Pd立方体。对于Pd @ Au_xCu _（1-x）卵黄壳纳米笼，它们显示了从可见光到近红外区的宽广的消光峰。我们的机理研究表明，Cu壳的溶解优选从略微截断的角开始，然后向内部发展，因为Cu {100}侧面受到十六烷基胺的表面覆盖层的保护。通过使用铜纳米结构和盐前体的不同组合，这种电流方法也可以扩展到生成其他中空金属纳米结构。

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