Enhanced fullerene-Au(111) coupling in (2√3 × 2√3)R30° superstructures with intermolecular interactions.
Enhanced fullerene-Au(111) coupling in (2√3 × 2√3)R30° superstructures with intermolecular interactions.
复制标题
增强的（111）在（2√3×2√3）R30°的上层结构中，具有分子间相互作用。
DOI：
10.3762/bjnano.6.147
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发表时间：
2015
影响因子：
3.1
通讯作者：
Karthäuser S
中科院分区：
文献类型：
--
作者：
Paßens M;Waser R;Karthäuser S
用扫描隧道显微镜和光谱研究了Au（111）表面富勒烯的无序和均匀（2 <$3 × 2 <$3）R30°超结构。结果表明，富勒烯单分子层在Au（111）表面的沉积和生长过程决定了超结构的形成。热能的供应对于Au空位形成过程的激活是重要的，因此是选择相应超结构的一个标准。然而，这里描述了甚至在室温下也可以形成空位-吸附原子对。后一个过程导致C60分子在扫描隧道显微镜图像中显得稍微更亮，并且基于详细的结构分析在无序（2 × 3 × 2 × 3）R30°超结构中被识别。此外，这些稍微明亮的C60分子形成均匀的（2 × 3 × 2 × 3）R30°超结构，表现出分子间的相互作用，可能是由Au吸附原子介导的。因此，在室温下形成的空位-吸附原子对直接影响所得的C60超结构。微分电导率谱揭示了在均匀的（2 π 3 x 2 π 3）R30°超结构中LUMO和LUMO+1轨道的简并度的提升，此外，混合富勒烯-Au（111）表面状态表明部分共价相互作用。
Disordered and uniform (2√3 × 2√3)R30° superstructures of fullerenes on the Au(111) surface have been studied using scanning tunneling microscopy and spectroscopy. It is shown that the deposition and growth process of a fullerene monolayer on the Au(111) surface determine the resulting superstructure. The supply of thermal energy is of importance for the activation of a Au vacancy forming process and thus, one criterion for the selection of the respective superstructure. However, here it is depicted that a vacancy–adatom pair can be formed even at room temperature. This latter process results in C60 molecules that appear slightly more bright in scanning tunnelling microscopy images and are identified in disordered (2√3 x 2√3)R30° superstructures based on a detailed structure analysis. In addition, these slightly more bright C60 molecules form uniform (2√3 x 2√3)R30° superstructures, which exhibit intermolecular interactions, likely mediated by Au adatoms. Thus, vacancy–adatom pairs forming at room temperature directly affect the resulting C60 superstructure. Differential conductivity spectra reveal a lifting of the degeneracy of the LUMO and LUMO+1 orbitals in the uniform (2√3 x 2√3)R30° superstructure and in addition, hybrid fullerene–Au(111) surface states suggest partly covalent interactions.