Orientation Ordering and Chiral Superstructures in Fullerene Monolayer on Cd (0001)
Orientation Ordering and Chiral Superstructures in Fullerene Monolayer on Cd (0001)
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Cd (0001) 上富勒烯单层的取向排序和手性超结构
DOI：
10.3390/nano10071305
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发表时间：
2020-07-01
期刊：
影响因子：
5.3
通讯作者：
Wang, Junzhong
中科院分区：
文献类型：
--
作者：
Shang, Yuzhi;Wang, Zilong;Wang, Junzhong
用低温扫描隧道显微镜(STM)研究了Cd(0001)表面上生长的C60薄膜从亚单层到第二单层的结构。相对于Cd(0001)晶格方向，存在着不同取向角度的C60磁畴。在(2√3×2√3)R30°结构域中，观察到具有五方、六方或6：6键的单个C60分子的取向无序。然而，在R26°区域出现了取向有序，使得所有的C60分子都采用相同的取向，6：6键朝上。特别是，在R4°和R8°区域分别观察到了由7个顺时针或逆时针C60分子组成的复杂手性基序。扫描隧道谱(STS)测量表明，由于衬底屏蔽和Cd向C60分子的电荷转移，吸附在Cd(0001)上的C60分子的HOMO能隙减小了2.1 eV。
The structure of C60 thin films grown on Cd (0001) surface has been investigated from submonolayer to second monolayer regimes with a low-temperature scanning tunneling microscopy (STM). There are different C60 domains with various misorientation angles relative to the lattice directions of Cd (0001). In the (2√3 × 2√3) R30° domain, orientational disorder of the individual C60 molecules with either pentagon, hexagon, or 6:6 bond facing up has been observed. However, orientation ordering appeared in the R26° domain such that all the C60 molecules adopt the same orientation with the 6:6 bond facing up. In particular, complex chiral motifs composed of seven C60 molecules with clockwise or anticlockwise handedness have been observed in the R4° and R8° domains, respectively. Scanning tunneling spectroscopy (STS) measurements reveal a reduced HOMO–LOMO gap of 2.1 eV for the C60 molecules adsorbed on Cd (0001) due to the substrate screening and charge transfer from Cd to C60 molecules.