title: Osmium Atoms and Os2 Molecules Move Faster on Selenium-Doped Compared to Sulfur-Doped Boronic Graphenic Surfaces.
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.
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Nicolas P E
authors.initials: NP
authors.lastname: Barry
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Anaïs
authors.initials: A
authors.lastname: Pitto-Barry
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Johanna
authors.initials: J
authors.lastname: Tran
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Simon E F
authors.initials: SE
authors.lastname: Spencer
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Adam M
authors.initials: AM
authors.lastname: Johansen
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Ana M
authors.initials: AM
authors.lastname: Sanchez
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Andrew P
authors.initials: AP
authors.lastname: Dove
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Rachel K
authors.initials: RK
authors.lastname: O'Reilly
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Deeth
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Richard
authors.initials: R
authors.lastname: Beanland
authors.affiliation: Department of Chemistry, Department of Statistics, and Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Sadler