Probing the mechanism for graphene nanoribbon formation on gold surfaces through Xray spectroscopy (Articolo in rivista)

Type
Label
  • Probing the mechanism for graphene nanoribbon formation on gold surfaces through Xray spectroscopy (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/c4sc01584c (literal)
Alternative label
  • Batra, A; Cvetko, D; Kladnik, G; Adak, O; Cardoso, C; Ferretti, A; Prezzi, D; Molinari, E; Morgante, A; Venkataraman, L (2014)
    Probing the mechanism for graphene nanoribbon formation on gold surfaces through Xray spectroscopy
    in Chemical science (Camb. 2010. Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Batra, A; Cvetko, D; Kladnik, G; Adak, O; Cardoso, C; Ferretti, A; Prezzi, D; Molinari, E; Morgante, A; Venkataraman, L (literal)
Pagina inizio
  • 4419 (literal)
Pagina fine
  • 4423 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 5 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 11 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA; Univ Ljubljana, Dept Phys, Ljubljana 61000, Slovenia; CNR IOM Lab Nazl TASC, I-34012 Trieste, Italy; CNR, Ist Nanosci, Modena, Italy; Univ Modena & Reggio Emilia, Dept Phys Math & Informat, Modena, Italy; Univ Trieste, Dept Phys, Trieste, Italy (literal)
Titolo
  • Probing the mechanism for graphene nanoribbon formation on gold surfaces through Xray spectroscopy (literal)
Abstract
  • We studied the formation of graphene nanoribbons (GNRs) via the self-assembly of 10,10?-dibromo-9,9?-bianthryl precursor molecules on gold surfaces with different synchrotron spectroscopies. Through X-ray photoemission spectroscopy core-level shifts, we followed each step of the synthetic process, and could show that the Br-C bonds of the precursors cleave at temperatures as low as 100 °C on both Au(111) and Au(110). We established that the resulting radicals bind to Au, forming Au-C and Au-Br bonds. We show that the polymerization of the precursors follows Br desorption from Au, suggesting that the presence of halogens is the limiting factor in this step. Finally, with angle-resolved ultraviolet photoemission spectroscopy and density functional theory we show that the GNR/Au interaction results in an upshift of the Shockley surface state of Au(111) by [similar]0.14 eV, together with an increased electron effective mass. (literal)
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