Interaction of thiadiazole additives with metal surfaces: Reactions and thin-film formation on gold as a model surface

Frank Hipler, Stefanie Gil Girol, Waleed Azzam, Roland A. Fischer, Christof Woll

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The adsorption and subsequent reactions of 2,5-dimercapto-1,3,4-thiadiazole (DMcT) and 2-mercapto5-methyl-1,3,4-thiadiazole (McMT) on polycrystalline gold films have been characterized by X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, IR spectroscopy, mass spectrometry, and scanning tunneling microscopy. Adsorption from solution was studied as well as vapor deposition under ultrahigh vacuum conditions. McMT adsorbs from an ethanolic solution to Au surfaces but decomposes to a large extent to give nonstoichiometric, nitrogen-deficient thin films containing smaller fragments, whereas DMcT forms thin films on Au surfaces consisting of intact molecules and oligomers resulting from surface polymerization. A temperature-dependent XPS study shows that McMT forms a thin film of intact molecules after deposition from the vapor phase at a substrate temperature of 130 K, which decomposes above 300 K to yield new, stable surface species.

Original languageEnglish
Pages (from-to)6072-6080
Number of pages9
JournalLangmuir
Volume19
Issue number15
DOIs
StatePublished - 22 Jul 2003
Externally publishedYes

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