Coverage-dependent Orientations of Dy@C82 Molecules on Au(111) Surface
- Received Date: 2012-05-06
- Endohedral metallofullerene, Scanning tunneling microscopy, Molecular orien-tation, Monolayer
Abstract: The adsorption and molecular orientation of Dy@C82 isomer I on Au(111) has been investi-gated using ultrahigh-vacuum scanning tunneling microscopy at 80 K. At low coverages, the Dy@C82 molecules tend to grow along the step edges of Au(111), forming small clusters and molecular chains. Adsorption of Dy@C82 on the edges is dominated by the fullerene-substrate interaction and presents various molecular orientations. At higher coverages, the Dy@C82 is found to form ordered islands consisting of small domains of equally oriented molecules. The Dy@C82 molecules in the islands prefer the adsorption configurations with the major C2 axis being approximately parallel to the surface of the substrate. Three preferable orientations of the Dy@C82 molecules are found in a two-dimensional hexagonal close packed overlayer. These observations are attributed to the interplay of the fullerene-substrate interaction and dipole-dipole interaction between the metallofullerenes.
|Citation:||Feng-yun Chen, Zhen-peng Hu. Coverage-dependent Orientations of Dy@C82 Molecules on Au(111) Surface[J]. Chinese Journal of Chemical Physics , 2012, 25(4): 423-428. doi: 10.1088/1674-0068/25/04/423-428|