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An experimental study of the growth and temperature dependence of lead on tungsten(110) by low energy electron microscopy and scanning tunneling microscopy.

机译：低能电子显微镜和扫描隧道显微镜对铅对钨（110）的生长和温度依赖性的实验研究。

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摘要

The growth of ultrathin films on metallic surfaces is very interesting scientifically and technologically. The presence of a surface or interface between two materials significantly alters the physical properties from that of the bulk, opening up a whole new realm of scientific investigation. Technology has made use of ultrathin films for a variety of purposes, such as corrosion protection, adhesion, lubrication, and bimetallic catalysis.; The growth of Pb on various substrate surfaces has been widely studied and has been shown to grow on a number of surfaces in the Stranski-Krastanov mode. W(110) has also been the target of much study as a substrate for numerous adsorbate phenomena.; I have used the Scanning Tunneling Microscope (STM) to probe the growth of the initial layer of Pb on W(110), as well as the development of stacked island clusters and ordered crystallites at various temperatures. Images taken with STM revealed the temperature-independent growth methods of the initial layer. A temperature dependence was found for the growth of the multilayer, however.; I also produced real-time images with the Low Energy Electron Microscope (LEEM). These experiments revealed a strong temperature dependence for the density of the islands, which form into ordered crystallites. Atomistic nucleation theory was applied to acquire the surface diffusion activation energy and the critical cluster size. Images also captured a range of crystallite activity during growth and sample heating. Finally, the desorption of multilayer Pb was observed, revealing distortions in the initial Pb layer due to the presence of the crystallites.
机译：在科学和技术上，金属表面超薄膜的生长非常有趣。两种材料之间存在表面或界面会大大改变其物理性质，从而打开整体的科学研究领域。技术已经将超薄膜用于多种目的，例如腐蚀保护，粘附，润滑和双金属催化。铅在各种基材表面上的生长已得到广泛研究，并已证明以Stranski-Krastanov模式在许多表面上生长。 W（110）作为许多吸附物现象的基质，也已成为许多研究的目标。我已经使用扫描隧道显微镜（STM）来探测W（110）上Pb初始层的生长，以及在不同温度下堆叠岛簇和有序微晶的发育。用STM拍摄的图像揭示了初始层的温度独立生长方法。然而，发现多层的生长具有温度依赖性。我还使用低能电子显微镜（LEEM）制作了实时图像。这些实验表明，岛的密度强烈依赖温度，这些岛形成有序的微晶。应用原子核理论获得表面扩散活化能和临界团簇尺寸。图像还捕获了生长和样品加热过程中的一系列微晶活性。最后，观察到多层Pb的解吸，揭示了由于微晶的存在，初始Pb层发生了变形。

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  • 作者

    Hoffman, Donell Brandon.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 106 p.
  • 总页数 106
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 O49;
  • 关键词

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