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首页> 外文期刊>RSC Advances >Island-type growth of Au-Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms
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Island-type growth of Au-Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms

机译：Au-Pt异二聚体的岛型生长：失配位错和应变消除机制的直接可视化

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摘要

Structural and analytical characterization related to the formation mechanism of Au-Pt heterodimers from polyhedral Pt nanocrystals is reported. The observation of specific lattice strain effects and the emergence of misfit dislocations point to the relevance of the Stranski-Krastanov growth mode as a means of explaining the previously reported dimerisation reaction between Au and Pt. Two size-dependent strain relief mechanisms were identified. For dimers grown from 4.7 nm seeds, the mechanism is related to bulk lattice strain accumulation at {111} planes along with lattice relaxation effects on other crystalline planes. However, for dimers grown from 11.2 nm seed sizes, the formation of misfit dislocations proved to be a highly efficient mechanism by which to release interface mismatch strain. Nanoscale chemical mapping at Au-Pt interfaces also revealed Au-Pt alloying to be unlikely under the mild temperature conditions employed in this work for Au-Pt heterodimer synthesis.
机译：报道了与多面体Pt纳米晶体的Au-Pt异二聚体形成机理有关的结构和分析表征。观察到的特定晶格应变效应和失配位错的出现表明，Stranski-Krastanov生长模式的相关性可以用来解释先前报道的Au和Pt之间的二聚反应。确定了两种尺寸依赖的应变消除机制。对于从4.7 nm种子生长的二聚体，其机制与{111}平面上的整体晶格应变积累以及其他晶面上的晶格弛豫效应有关。然而，对于从11.2 nm种子尺寸生长的二聚体，错配位错的形成被证明是释放界面错配应变的高效机制。在Au-Pt界面上进行纳米级化学制图也显示，在这项工作中所用的Au-Pt异二聚体合成的温和温度条件下，Au-Pt合金化的可能性很小。

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