High resolution X-ray photoelectron spectroscopy of L-Cysteine self-assemble films (Articolo in rivista)

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  • High resolution X-ray photoelectron spectroscopy of L-Cysteine self-assemble films (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/b405516k (literal)
Alternative label
  • O. Cavalleri; G. Gonella; S. Terreni; M. Vignolo; L. Floreano; A. Morgante; M. Canepa; R. Rolandi (2004)
    High resolution X-ray photoelectron spectroscopy of L-Cysteine self-assemble films
    in Physical chemistry chemical physics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • O. Cavalleri; G. Gonella; S. Terreni; M. Vignolo; L. Floreano; A. Morgante; M. Canepa; R. Rolandi (literal)
Pagina inizio
  • 4042 (literal)
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  • 6 (literal)
Rivista
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  • 5 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • O. Cavalleri,a; G. Gonella,a; S. Terreni,a; M. Vignolo,a; L. Floreano,b; A. Morgante,bc; M. Canepa,a; and R. Rolandi,a a INFM and Dipartimento di Fisica, Universita` di Genova, via Dodecaneso 33, 16146 Genova, Italy.E-mail:rolandi@fisica.unige.it;Fax:þ39010314218;Tel:þ390103536424 b Laboratorio INFM-TASC, Trieste, Italy c Dipartimento di Fisica, Universita` di Trieste, Italy (literal)
Titolo
  • High resolution X-ray photoelectron spectroscopy of L-Cysteine self-assemble films (literal)
Abstract
  • The increasing demand for heterogeneous materials prompts the interest for the physics and chemistry of organic -inorganic interfaces. Within this field of interest we have investigated the electronic states of L-cysteine (Cys) adsorbed on Au(111) from aqueous solution with synchrotron-based, high resolution X-ray photoemission spectroscopy. The analysis of the S 2p core level region in pristine samples prepared with purified Cys indicates that Cys adsorbs on gold as a thiolate. The absence of a signal related to physisorbed sulfur indicates that Cys forms a monomolecular layer. The high resolution allowed us to resolve two components in the C 1s spectral region related to carboxyl. The comparative analysis of C 1s, N 1s and O 1s core level regions indicates the presence of the neutral and ionic form for both the carboxyl and the amine groups. From the quantitative analysis of the C 1s and N 1s data we can infer that the zwitterionic form is the prevalent one, with a ratio of zwitterionic to neutral molecules of 3 : 1. This value is quite different from that in the deposition solution. Prolonged exposure to the X-ray beam and thermal annealing induce the formation of atomic sulfur through S-C bond breaking and molecular fragment desorption. This response to X-ray irradiation differs from the results recently reported on long chain alkanethiols. (literal)
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