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Originally published in Science Express on 18 January 2007
Science 9 March 2007:
Vol. 315. no. 5817, pp. 1391 - 1393
DOI: 10.1126/science.1135302
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Reports

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. Rahman2

We found that anthraquinone diffuses along a straight line across a flat, highly symmetric Cu(111) surface. It can also reversibly attach one or 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 indicated a substrate-mediated attraction of ~0.12 electron volt (eV). Scanning tunneling microscopy revealed individual steps of the molecular complex on its diffusion pathway, with increases of ~0.03 and ~0.02 eV in the diffusion barrier upon attachment of the first and second CO2 molecule, respectively.

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. E-mail: ludwig.bartels{at}ucr.edu

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