Osmium atoms and Os2 molecules move faster on selenium-doped compared to sulfur-doped boronic graphenic surfaces

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2015-07Author
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.
Sadler, P.J.
Keyword
Osmium atomsOs2 molecules
selenium-doped boronic graphenic surfaces
sulfur-doped boronic graphenic surfaces
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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 use, distribution and reproduction in any medium, provided the author and source are cited.Peer-Reviewed
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openAccess
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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.Version
Published versionCitation
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.Link to Version of Record
https://doi.org/10.1021/acs.chemmater.5b01853Type
Articleae974a485f413a2113503eed53cd6c53
https://doi.org/10.1021/acs.chemmater.5b01853