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Osmium atoms and Os2 molecules move faster on selenium-doped compared to sulfur-doped boronic graphenic surfaces
Barry, Nicolas P.E. Pitto-Barry, Anaïs Tran, J. Spencer, S.E.F. Johansen, A.M. Sanchez, A.M. Dove, A.P. O'Reilly, R.K. Deeth, R.J. Beanland, R.
Barry, Nicolas P.E.
Pitto-Barry, Anaïs
Tran, J.
Spencer, S.E.F.
Johansen, A.M.
Sanchez, A.M.
Dove, A.P.
O'Reilly, R.K.
Deeth, R.J.
Beanland, R.
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2015-07
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© 2015 American Chemical Society. This is an open access article
published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted
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Abstract
We deposited Os atoms on S- and Se-doped boronic graphenic surfaces by electron bombardment of micelles containing 16e complexes [Os(p-cymene)(1,2-dicarba-closo-dodecarborane-1,2-diselenate/dithiolate)] encapsulated in a triblock copolymer. The surfaces were characterized by energy-dispersive X-ray (EDX) analysis and electron energy loss spectroscopy of energy filtered TEM (EFTEM). Os atoms moved ca. 26× faster on the B/Se surface compared to the B/S surface (233 ± 34 pm·s–1 versus 8.9 ± 1.9 pm·s–1). Os atoms formed dimers with an average Os–Os distance of 0.284 ± 0.077 nm on the B/Se surface and 0.243 ± 0.059 nm on B/S, close to that in metallic Os. The Os2 molecules moved 0.83× and 0.65× more slowly than single Os atoms on B/S and B/Se surfaces, respectively, and again markedly faster (ca. 20×) on the B/Se surface (151 ± 45 pm·s–1 versus 7.4 ± 2.8 pm·s–1). Os atom motion did not follow Brownian motion and appears to involve anchoring sites, probably S and Se atoms. The ability to control the atomic motion of metal atoms and molecules on surfaces has potential for exploitation in nanodevices of the future.
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Barry NPE, Pitto-Barry A, Tran J et al (2015) Osmium atoms and Os2 molecules move faster on selenium-doped compared to sulfur-doped boronic graphenic surfaces. Chemistry of Materials. 27(14): 5100-5105.
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