Adsorption and self-assembled structures of sexithiophene on the Si(111)-√3×√3-Ag surface.
Adsorption and self-assembled structures of sexithiophene on the Si(111)-√3×√3-Ag surface.
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六噻吩在Si(111)-√3×√3-Ag表面的吸附和自组装结构。
DOI：
10.1063/1.4921568
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Y. Yoshimoto
中科院分区：
文献类型：
--
作者：
T. Yokoyama;M. Kawasaki;T. Asari;S. Ohno;Masatoshi Tanaka;Y. Yoshimoto
利用扫描隧道显微镜（STM）、低能电子衍射和密度泛函理论计算研究了α-硫代噻吩（α-6T）在Si(111)-Ag表面的吸附和自组装结构。吸附的α-6T分子排列成单向的分子行，并具有并排的取向。分子行在填充态STM图像中显示出三种不同的外观，反映了不同的吸附位点。从隧道光谱中，我们发现α-6T的填充态STM图像应该受到Si(111)-Ag表面态的影响。在单层覆盖下，三分子行顺序排列导致α-6T覆盖层紧密排列。
The adsorption and self-assembled structures of α-sexithiophene (α-6T) have been investigated on a Si(111)-Ag surface using scanning tunneling microscopy (STM), low-energy electron diffraction, and density functional theory calculations. The adsorbed α-6T molecules are arranged into unidirectional molecular rows with a side-by-side orientation. The molecular rows reveal three kinds of appearances in the filled-state STM images, which reflect the distinct adsorption sites. From tunneling spectroscopy, we find that the filled-state STM images of α-6T should be influenced by the surface states of Si(111)-Ag. At one monolayer coverage, sequentially ordering of the triple molecular rows results in the close-packed arrangement of the α-6T overlayer.