Competing Pathways in N-Allylurea Adsorption on Si(111)-(7 x 7) (Articolo in rivista)

Type
Label
  • Competing Pathways in N-Allylurea Adsorption on Si(111)-(7 x 7) (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp2103726 (literal)
Alternative label
  • De Renzi V; Arnaud GF; del Pennino U (2012)
    Competing Pathways in N-Allylurea Adsorption on Si(111)-(7 x 7)
    in Journal of physical chemistry. C
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • De Renzi V; Arnaud GF; del Pennino U (literal)
Pagina inizio
  • 5673 (literal)
Pagina fine
  • 5680 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 116 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. Univ Modena & Reggio Emilia, Dipartimento Fis, I-41125 Modena, Italy 2. CNR Inst Nanosci, Ctr S3, I-41125 Modena, Italy (literal)
Titolo
  • Competing Pathways in N-Allylurea Adsorption on Si(111)-(7 x 7) (literal)
Abstract
  • Functionalization of silicon surfaces with N-allylurea (CH2=CH-CNH-CO-NH2) represents a valuable strategy to obtain covalently bonded Si-C interfaces with amino and/or carbonyl termination. In this work, we studied N-allylurea adsorption on the Si(111)-(7× 7) surface by combining X-ray and ultraviolet photoemission spectroscopy (XPS and UPS) with high resolution energy loss spectroscopy (HREELS) measurements. XPS core level analysis provides information on the molecular attachment process. Si-C covalent bonding is evidenced by the presence of a C Is component at 284.8 eV, while interaction through N-Si bonding is proved by the presence of a N 1s component at 397.8 eV. Three different adsorption mechanisms are envisaged: (I) [2 + 2]-like cycloaddition occurring at the rest atom-adatom dimer through cleavage of the vinyl group, (II) Si-N bonding at adatom sites upon cleavage of NH2 and rearrangement of the ureic group to form an imidol species (-N=C-OH), with release of a H atom, and (III) hydrosilylation at adatom sites, through cleavage of the vinyl group and involvement of H atoms provided by reaction II. (literal)
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