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Published Online January 18, 2007
Science DOI: 10.1126/science.1135302

Reports

Submitted on September 19, 2006
Accepted on January 5, 2007

A Molecule Carrier

K. L. Wong 1, G. Pawin 1, K.-Y. Kwon 1, X. Lin 1, T. Jiao 1, U. Solanki 1, R. H. J. Fawcett 1, L. Bartels 1*, S. Stolbov 2, T. S. Rahman 2

1 Pierce Hall, University of California, Riverside, CA 92521, USA.
2 Department of Physics, University of Central Florida, Orlando, FL 32816, USA.

* To whom correspondence should be addressed.
L. Bartels , E-mail: ludwig.bartels{at}ucr.edu

Anthraquinone is found to diffuse along a straight line across a flat, highly-symmetric Cu(111) surface. It can also attach reversibly up to two CO2 molecules as 'cargo' and act as a 'molecule carrier', thereby transforming the diffusive behavior of the CO2 molecules from isotropic to linear. Density functional theory calculations indicate a substrate-mediated attraction of {approx} 0.12 electron volt (eV). Scanning tunneling microscopy reveals individual steps of the molecular complex on its diffusion pathway and an increase in the diffusion barrier by {approx} 0.03 and {approx} 0.02 eV upon attachment of the first and the second CO2 molecule, respectively.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)