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Science 6 September 1996:
Vol. 273. no. 5280, pp. 1371 - 1373
DOI: 10.1126/science.273.5280.1371
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Reports

Threefold Electron Scattering on Graphite Observed with C60-Adsorbed STM Tips

K. F. Kelly, D. Sarkar, G. D. Hale, S. J. Oldenburg, N. J. Halas *

The scanning tunneling microscope (STM) has been used to observe threefold symmetric electron scattering from point defects on a graphite surface. These theoretically predicted electronic perturbations could not be observed with a bare metal tip but could only be imaged when a fullerene (C60) molecule was adsorbed onto the tunneling region (apex) of an STM tip. Functionalizing an STM tip with an appropriate molecular adsorbate alters the density of states near the Fermi level of the tip and changes its imaging characteristics.

Department of Electrical and Computer Engineering, Rice Quantum Institute, and Center for Nanoscale Science and Technology, Rice University, Post Office Box 1892, Houston, TX 77251, USA.
*   To whom correspondence should be addressed.


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