Self‐Assembled Pb Nanostructures on Si(111) Surfaces: From Nanowires to Nanorings
Self‐Assembled Pb Nanostructures on Si(111) Surfaces: From Nanowires to Nanorings
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DOI：
10.1002/adma.200901063
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发表时间：
2009-12
影响因子：
29.4
通讯作者：
Ruixia Wu;Yi Zhang;F. Pan;Lili Wang;Xucun Ma;J. Jia;Q. Xue
中科院分区：
文献类型：
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作者：
Ruixia Wu;Yi Zhang;F. Pan;Lili Wang;Xucun Ma;J. Jia;Q. Xue
描述了一种金属的模板定向生长方法，其中通过分子束外延制备具有原子级控制的宽度、厚度（高度）和表面位置的超长单晶金属纳米线的有序阵列。他们随后的检查，在原位扫描隧道显微镜也概述。通过在Si（111）衬底上淀积Ge，首次获得了由富Ge非公度相和α 3 × α 3相交替组成的相分离条纹图案。Pb在该图案化表面上的进一步沉积导致超长Pb纳米线的有序阵列。利用同样的机制，也可以制备超导铅纳米环。在我们最近的工作的这篇综述中，这些Pb单晶纳米线和纳米环被证明是在降维条件下研究超导性的理想平台。此外，由于两个相的宽度和空间分布可以通过Ge覆盖率和衬底温度精确控制，并且由于金属总是选择性地在两个相中的一个上成核，因此这种模板定向生长方法可以应用于广泛的金属。
A template‐directed growth method for metals is described in which ordered arrays of super‐long single‐crystalline metal nanowires with atomic‐level‐controlled width, thickness (height), and surface location are prepared by molecular beam epitaxy. Their subsequent examination by in situ scanning tunneling microscopy is also outlined. A phase‐separated stripe pattern composed of alternately a Ge‐rich incommensurate phase and a √3 × √3 phase is first obtained by Ge deposition on Si(111) substrates. Further deposition of Pb on this patterned surface leads to a well‐ordered array of super‐long Pb nanowires. Using the same mechanism, superconducting Pb nanorings can also be fabricated. In this review of our recent work, these Pb single‐crystalline nanowires and nanorings are shown to serve as an ideal platform for the study of superconductivity in reduced dimensionalities. Furthermore, because the widths and spatial distributions of two phases can be precisely controlled by the Ge coverage and substrate temperature, and because a metal will always selectively nucleate on one of two phases, this template‐directed growth method can be applied to a wide range of metals.