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  Modification of alkanethiolate monolayers by low energy electron irradiation: Dependence on the substrate material and on the length and isotopic composition of the alkyl chains

Zharnikov, M., Frey, S., Heister, K., & Grunze, M. (2000). Modification of alkanethiolate monolayers by low energy electron irradiation: Dependence on the substrate material and on the length and isotopic composition of the alkyl chains. Langmuir, 16(6), 2697-2705. doi:10.1021/la991034r.

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 Urheber:
Zharnikov, M., Autor
Frey, S., Autor
Heister, K., Autor
Grunze, M.1, Autor           
Affiliations:
1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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 Zusammenfassung: The low energy electron induced damage in self-assembled monolayers of dodecanethiolate, octadecanethiolate, and perdeuterated eicosanethiolate on gold and octadecanethiolate on silver has been investigated in situ by X-ray photoelectron spectroscopy and angle resolved near edge X-ray absorption fine structure spectroscopy. All investigated systems exhibit qualitatively similar behavior with respect to low energy electron irradiation. The most noticeable processes are the loss of orientational and conformational order, partial dehydrogenation with CC double bond formation, desorption of the layer fragments, reduction of the thiolate species, and the appearance of new sulfur species. The cross sections for the rates of the individual irradiation-induced processes have been determined. For the films on gold all these processes are found to evolve with similar rates, except for the formation of CC double bonds and desorption of sulfur-containing fragments. The extent of the latter process is noticeably smaller in the longer-chain films as compared to their shorter-chain counterparts. The response of the alkyl matrix and the S−Au interface to electron irradiation are not directly correlated. Whereas the irradiation-induced processes in the alkyl matrix are found to be essentially independent of the alkyl chain length and the substrate material, the extent and rate of the thiolate species reduction and new sulfur species formation are mainly determined by the strength and character of the thiolate−substrate bond. No large isotopic effect in the irradiation-induced dehydrogenation process was observed. Deuterated films are found to be only slightly less sensitive to electron irradiation as compared to their hydrogen-containing counterparts.

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Sprache(n): eng - English
 Datum: 1999-10-211999-07-301999-10-212000-01-222000
 Publikationsstatus: Erschienen
 Seiten: 9
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1021/la991034r
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Titel: Langmuir
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Columbus, OH : American Chemical Society
Seiten: - Band / Heft: 16 (6) Artikelnummer: - Start- / Endseite: 2697 - 2705 Identifikator: ISSN: 0743-7463
CoNE: https://pure.mpg.de/cone/journals/resource/954925541194