Self-assembled monolayers of semifluorinated alkaneselenolates on noble metal substrates

A. Shaporenko, P. Cyganik, M. Buck, Abraham Ulman, M. Zharnikov

Research output: Contribution to journalArticle

Abstract

Self-assembled monolayers (SAMs) formed from semifluorinated dialkyldiselenol (CF 3(CF 2) 5(CH 2) 2-Se-) 2 (F6H2SeSeH2F6) on polycrystalline Au(111) and Ag(111) were characterized by high-resolution X-ray photoelectron spectroscopy, infrared reflection absorption spectroscopy, near edge X-ray absorption fine structure spectroscopy, scanning tunneling microscopy, and contact angle measurements. The Se-Se linkage of F6H2SeSeH2F6 was found to be cleaved upon the adsorption, followed by the formation of selenolate-metal bond. The resulting F6H2Se SAMs are well-ordered, densely packed, and contamination-free. The packing density of these films is governed by the bulky fluorocarbon part, which exhibits the expected helical conformation. A noncommensurate hexagonal arrangement of the F6H2Se molecules with an average nearest-neighbor spacing of about 5.8 ± 0.2 Å, close to the van der Waals diameter the fluorocarbon chain, was observed on Au(111). The orientation of the fluorocarbon chains in the F6H2Se SAMs does not depend on the substrate-the average tilt angle of these moieties was estimated to be about 21-22° on both Au and Ag.

Original languageEnglish (US)
Pages (from-to)8204-8213
Number of pages10
JournalLangmuir
Volume21
Issue number18
DOIs
StatePublished - Aug 30 2005

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Fluorocarbons
fluorocarbons
Self assembled monolayers
Precious metals
noble metals
Substrates
X ray absorption near edge structure spectroscopy
packing density
infrared reflection
Scanning tunneling microscopy
Angle measurement
Absorption spectroscopy
linkages
Contact angle
Conformations
scanning tunneling microscopy
absorption spectroscopy
contamination
Contamination
x rays

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Self-assembled monolayers of semifluorinated alkaneselenolates on noble metal substrates. / Shaporenko, A.; Cyganik, P.; Buck, M.; Ulman, Abraham; Zharnikov, M.

In: Langmuir, Vol. 21, No. 18, 30.08.2005, p. 8204-8213.

Research output: Contribution to journalArticle

Shaporenko, A, Cyganik, P, Buck, M, Ulman, A & Zharnikov, M 2005, 'Self-assembled monolayers of semifluorinated alkaneselenolates on noble metal substrates', Langmuir, vol. 21, no. 18, pp. 8204-8213. https://doi.org/10.1021/la050535b
Shaporenko, A. ; Cyganik, P. ; Buck, M. ; Ulman, Abraham ; Zharnikov, M. / Self-assembled monolayers of semifluorinated alkaneselenolates on noble metal substrates. In: Langmuir. 2005 ; Vol. 21, No. 18. pp. 8204-8213.
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