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Association Between Gold Grain Orientation and Its Periodic Steps Formed at the Gold/Substrate Interface
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2018-05-08 00:00:00 , DOI: 10.1021/acs.jpcc.7b12765
Linfeng Chen 1 , Maria Koifman Khristosov 1, 2 , Cecile Saguy 3 , Alex Katsman 1 , Boaz Pokroy 1, 2
Affiliation  

Nanoscale step structures have attracted recent interest owing to their importance in both fundamental and applied research, for example in adsorption, in catalysis, and in directing nanowire growth. Here, using a template-stripping method to obtain vicinal-like surface structures on grains of polycrystalline gold, we investigated the effect of annealing temperature on the formation of these surfaces. Our experimental results revealed a clear correlation between the grain orientation angle (GOA) and the step periodicity along ⟨112⟩ crystallographic direction on the grain/substrate interface. The GOA was measured by using the electron backscatter diffraction with respect to the sample’s normal direction. Using scanning tunneling microscopy to examine the same given grains, we found that their step periodicity decreases with increasing GOA. Formation of low-index terraces detaching from the substrate are considered as a kind of solid–solid dewetting. These results provide further understanding of the periodic step structure formation at the gold/substrate interface in a given grain.

中文翻译:

金晶粒取向及其在金/底物界面形成的周期性步骤之间的关联

由于纳米级台阶结构在基础和应用研究中的重要性,例如在吸附,催化和指导纳米线生长中的重要性,因此引起了近期的兴趣。在这里,我们使用模板剥离方法在多晶金的晶粒上获得类似点状的表面结构,我们研究了退火温度对这些表面形成的影响。我们的实验结果表明,晶粒取向角(GOA)与沿晶粒/基体界面上的⟨112⟩结晶方向的台阶周期性之间存在明显的相关性。通过使用电子反向散射衍射法相对于样品的法线方向测量GOA。使用扫描隧道显微镜检查相同的给定晶粒,我们发现它们的阶跃周期性随GOA的增加而减小。从基材上分离出来的低折射率阶地的形成被认为是一种固-固反润湿。这些结果提供了对给定晶粒中金/衬底界面处周期性阶梯结构形成的进一步理解。
更新日期:2018-05-08
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