Scanning tunneling microscopy of C{sub 60} and C{sub 70} on ordered Au(111) and Au(110): Molecular structure and electron transmission
- Purdue Univ., West Lafayette, IN (United States)
Scanning tunneling microscopy (STM) images are reported for C{sub 60} and C{sub 70} layers on ordered Au(111) and Au(110) surfaces in air and in aqueous 0.1 M HClO{sub 4}. Hexagonal close-packed layers were obtained for both C{sub 60} and C{sub 70} on Au(111); however, the latter features distortions consistent with the presence of groups of {open_quotes}standing-up{close_quotes} and {open_quotes}lying-down{close_quotes} C{sub 70} orientations. While the fullerene layers are less ordered on Au(110), the molecules are more rigidly held and can yield STM images with resolved intramolecular carbon rings. The likely modes of tip-surface electron tunneling via the adsorbed fullerenes, involving {open_quotes}superexchange{close_quotes} coupling, are discussed briefly in light of the observed STM imaging properties.
- OSTI ID:
- 555011
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 2 Vol. 96; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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