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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异二聚体的岛式生长：超出错位脱位和应变浮雕机制的直接可视化

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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异二聚体形成机制相关的结构和分析表征。观察特定的晶格应变效应和错配脱位的出现点指向斯特拉斯基 - 克拉特坦生长模式的相关性作为解释先前报道的Au和Pt之间先前报道的二聚化反应的方法。鉴定了两个尺寸依赖性应变释放机制。对于从4.7nm种子生长的二聚体，该机制与{111}平面上的批量晶格应变累积以及其他晶平面上的晶格松弛作用有关。然而，对于从11.2nm种子尺寸生长的二聚体，被证明是释放界面不匹配应变的高效机制。 Au-Pt界面的纳米级化学映射还揭示了Au-Pt的合金化在该工作中使用的温和温度条件下不太可能用于Au-Pt异二聚体合成。

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