Self-assembled monolayers of semifluorinated alkaneselenolates on noble metal substrates

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

Research output: Contribution to journalArticle

Abstract

Self-assembled monolayers (SAMs) formed from semifluorinated dialkyldiselenol (CF3(CF2)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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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