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NEXAFS investigations of highly-ordered ultrathin films of DME-DCNQI on Ag (111)

Bässler, M. LU ; Fink, R. ; Heske, C. ; Müller, J. ; Väterlein, P. ; Von Schütz, J. U. and Umbach, E. (1996) In Thin Solid Films 284-285. p.234-237
Abstract

Ultrathin layers of 2,5-dimethyl-N,N′-dicyanoquinonediimine (DMe-DCNQI) have been grown on a Ag (111) surface by vapour deposition in ultrahigh vacuum. The films have been characterized by near-edge X-ray absorption fine structure (NEXAFS), low-energy electron diffraction (LEED), Thermal desorption measurements and X-ray photoelectron spectroscopy to study orientation, lateral order, interface bonding, and electronic structure. On the clean Ag(111)-surface the DMe-DCNQI molecules adsorb in parallel orientation in the monolayer regime as well, as for thicker layers up to thicknesses of more than 10 nm as proved by NEXAFS. For the first two layers a LEED pattern is observed indicating high lateral order in the interface. In addition,... (More)

Ultrathin layers of 2,5-dimethyl-N,N′-dicyanoquinonediimine (DMe-DCNQI) have been grown on a Ag (111) surface by vapour deposition in ultrahigh vacuum. The films have been characterized by near-edge X-ray absorption fine structure (NEXAFS), low-energy electron diffraction (LEED), Thermal desorption measurements and X-ray photoelectron spectroscopy to study orientation, lateral order, interface bonding, and electronic structure. On the clean Ag(111)-surface the DMe-DCNQI molecules adsorb in parallel orientation in the monolayer regime as well, as for thicker layers up to thicknesses of more than 10 nm as proved by NEXAFS. For the first two layers a LEED pattern is observed indicating high lateral order in the interface. In addition, films of two radical ion salts, Cu(DMe-DCNQI)2 and Na(DMe-DCNQI)2, were prepared by subsequent evaporation of DMe-DCNQI and metal counterions and by annealing. The redox reaction strongly affects the fine structure in the NEXAFS spectra of DMe-DCNQI which correlates with a strong admixture of metal orbitals.

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author
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publishing date
type
Contribution to journal
publication status
published
keywords
Metall-organic heterostructures, Organic substances, Structural properties, Thin organic films
in
Thin Solid Films
volume
284-285
pages
4 pages
publisher
Elsevier
external identifiers
  • scopus:0030235019
ISSN
0040-6090
DOI
10.1016/S0040-6090(95)08312-X
language
English
LU publication?
no
id
1304a78a-d6f7-4c72-a147-305eb10a622e
date added to LUP
2020-11-02 16:57:43
date last changed
2022-02-01 17:27:06
@article{1304a78a-d6f7-4c72-a147-305eb10a622e,
  abstract     = {{<p>Ultrathin layers of 2,5-dimethyl-N,N′-dicyanoquinonediimine (DMe-DCNQI) have been grown on a Ag (111) surface by vapour deposition in ultrahigh vacuum. The films have been characterized by near-edge X-ray absorption fine structure (NEXAFS), low-energy electron diffraction (LEED), Thermal desorption measurements and X-ray photoelectron spectroscopy to study orientation, lateral order, interface bonding, and electronic structure. On the clean Ag(111)-surface the DMe-DCNQI molecules adsorb in parallel orientation in the monolayer regime as well, as for thicker layers up to thicknesses of more than 10 nm as proved by NEXAFS. For the first two layers a LEED pattern is observed indicating high lateral order in the interface. In addition, films of two radical ion salts, Cu(DMe-DCNQI)<sub>2</sub> and Na(DMe-DCNQI)<sub>2</sub>, were prepared by subsequent evaporation of DMe-DCNQI and metal counterions and by annealing. The redox reaction strongly affects the fine structure in the NEXAFS spectra of DMe-DCNQI which correlates with a strong admixture of metal orbitals.</p>}},
  author       = {{Bässler, M. and Fink, R. and Heske, C. and Müller, J. and Väterlein, P. and Von Schütz, J. U. and Umbach, E.}},
  issn         = {{0040-6090}},
  keywords     = {{Metall-organic heterostructures; Organic substances; Structural properties; Thin organic films}},
  language     = {{eng}},
  month        = {{09}},
  pages        = {{234--237}},
  publisher    = {{Elsevier}},
  series       = {{Thin Solid Films}},
  title        = {{NEXAFS investigations of highly-ordered ultrathin films of DME-DCNQI on Ag (111)}},
  url          = {{http://dx.doi.org/10.1016/S0040-6090(95)08312-X}},
  doi          = {{10.1016/S0040-6090(95)08312-X}},
  volume       = {{284-285}},
  year         = {{1996}},
}