科研之友
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摘要
Scanning tunneling microscopy has been used to spatially image individual fluorofullerene C60F18 molecules on Si(111)-7x7 surface. The images have been interpreted with the help of ab initio calculations. C60F18 molecules interact with the surface with F atoms pointing down, whereas a large electric dipole moment of the molecule induces strong polarization on the surface but the charge transfer is small. It has been shown that during the time of image collection, some of the F atoms migrate from fluorofullerene molecule due to F binding energy on a Si surface being nearly twice the mean value on the C-60 molecule.
- 出版日期2010
