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Osmium atoms and Os2 molecules move faster on selenium-doped compared to sulfur-doped boronic graphenic surfaces
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Barry, Nicolas P. E., Pitto-Barry, Anaïs, Tran, Johanna, Spencer, Simon E. F., Johansen, Adam M., Sanchez, Ana M., Dove, Andrew P., O’Reilly, Rachel K., Deeth, Robert J., Beanland, R. and Sadler, P. J. (2015) Osmium atoms and Os2 molecules move faster on selenium-doped compared to sulfur-doped boronic graphenic surfaces. Chemistry of Materials, 27 (14). pp. 5100-5105. doi:10.1021/acs.chemmater.5b01853 ISSN 0897-4756.
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Official URL: http://dx.doi.org/10.1021/acs.chemmater.5b01853
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.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QD Chemistry | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics Faculty of Science, Engineering and Medicine > Science > Statistics |
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Library of Congress Subject Headings (LCSH): | Osmium, Graphene, Surface chemistry | ||||||
Journal or Publication Title: | Chemistry of Materials | ||||||
Publisher: | American Chemical Society | ||||||
ISSN: | 0897-4756 | ||||||
Official Date: | 6 July 2015 | ||||||
Dates: |
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Volume: | 27 | ||||||
Number: | 14 | ||||||
Number of Pages: | 5 | ||||||
Page Range: | pp. 5100-5105 | ||||||
DOI: | 10.1021/acs.chemmater.5b01853 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 31 December 2015 | ||||||
Date of first compliant Open Access: | 31 December 2015 | ||||||
Funder: | Leverhulme Trust (LT), University of Warwick, Engineering and Physical Sciences Research Council (EPSRC), European Research Council (ERC) | ||||||
Grant number: | ECF-2013 414 (LT), RDF 2013-14 (UW), EP/G004897/1 (EPSRC), 247450 (ERC) | ||||||
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