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arXiv 0801.3566cond-mat.mtrl-sci
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无衬底情况下的六角螺旋生长

Hexagonal spiral growth in the absence of a substrate

Laura L. A. Adams

摘要:

螺旋六边形(350 - 1000 nm的宽度)从纳米粒子的溶液形成的实验。化学合成的镉纳米晶体的反应产物的透射电子显微镜图像表明,六边形的诞生没有静态螺旋或边缘位错的帮助下进行,也就是说,它们螺旋没有由底层基板提供的约束。相反,表面生长机制依赖于我们认为是一个动态位错确定为一个小纳米晶体,跨越在晶体表面的螺旋六边形密集聚集。我们称之为“馈线”的这个微束在生长过程中似乎也将纳米晶体释放到螺旋中。

英文摘要:

Experiments on the formation of spiraling hexagons (350 - 1000 nm in width) from a solution of nanoparticles are presented. Transmission electron microscopy images of the reaction products of chemically synthesized cadmium nanocrystals indicate that the birth of the hexagons proceeds without assistance from static screw or edge dislocatons, that is, they spiral without constraints provided by an underlying substrate. Instead, the apparent growth mechanism relies on what we believe is a dynamical dislocation identified as a dense aggregate of small nanocrystals that straddles the spiraling hexagon at the crystal surface. This nanocrystal bundle, which we term the "feeder", also appears to release nanocrystals into the spiral during the growth process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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