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- Title
FULLERENES ON METAL AND SEMICONDUCTOR SURFACES: SCANNING TUNNELING MICROSCOPY STUDIES.
- Authors
WANG, XIANG-DONG; HASHIZUME, T.; SAKURAI, T.
- Abstract
In this paper, we review our recent scanning tunnelling microscopy studies of fullerenes 60 and 70. We focus our work on adsorption and reaction of these fullerenes on Si(111)7×7 and (100)2×1 semiconductor surfaces, as well as on (111)1×1 and (111)1×1 noble metal surfaces. By using STM, the adsorption geometry and reconstructions of fullerenes are directly observed on these surfaces, and the intramolecular structures are revealed in high resolution STM images. It is found that fullerenes are strongly bonded to the Si(100) and Si(111) surfaces so that the free rotation of 60 and 70 in their bulk phases is stopped. Local orderings with c(3×4) and c(4×4) reconstructions are observed for the first layer of C60 on the Si(100) surface. Well-ordered crystalline multilayer films can be formed on the Si(100) surface. The intramolecular structures observed for 60 on the Si(100) surface are interpreted based on the local charge distribution on the molecule, in good agreement with a recent theoretical calculation. The (111)1×1 and (111)1×1 surfaces are found to be good substrates for ordered C60 and 70 film growth. While the interaction of fullerenes with Ag(111) surface is weaker than that on the Cu(111) surface, rotation of 60 in bulk phase is stopped on both surfaces. Well-ordered commensurate reconstructions are observed for 60 and 70 on both surfaces. Bias-voltage-dependent intramolecular structures are observed for the first layer of both C60 and 70, which reveal the local charge density distribution on these molecules. The results are in good agreement with a recent theoretical calculation. The interesting behavior of the 60/70 mixture on Cu(111) surface is also reported.
- Publication
Modern Physics Letters B, 1994, Vol 8, Issue 26, p1597
- ISSN
0217-9849
- Publication type
Article
- DOI
10.1142/S0217984994001564