Self-assembled monolayers of semifluorinated alkaneselenolates on noble metal substrates.

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

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

Self-assembled monolayers (SAMs) formed from semifluorinated dialkyldiselenol (CF3(CF2)(5)(CH2)(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 angstrom, 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 degrees on both Au and Ag.

Original languageEnglish
Pages (from-to)8204
Number of pages8204
JournalLangmuir
Volume21
DOIs
Publication statusPublished - 30 Aug 2005

Keywords

  • RAY PHOTOELECTRON-SPECTROSCOPY
  • ABSORPTION FINE-STRUCTURE
  • SCANNING-TUNNELING-MICROSCOPY
  • ALKYL FLUOROALKYL DISULFIDES
  • X-RAY
  • ALKANETHIOLATE MONOLAYERS
  • MOLECULAR-ORIENTATION
  • POLYCRYSTALLINE GOLD
  • ELECTROCHEMICAL MEASUREMENTS
  • ENERGY CALCULATIONS

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