Self-assembled structures of alkanethiols on gold-coated cantilever tips and substrates for atomic force microscopy: Molecular organisation and conditions for reproducible deposition

Dimitrios A. Lamprou, James R. Smith, Thomas G. Nevell, Eugen Barbu, Colin R. Willis, John Tsibouklis*

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Measurements of surface-liquid interactions (contact-angle goniometry) and tip-surface adhesion forces (atomic force microscopy) combined with infrared spectroscopic studies have been used to investigate surface-preparation and solution-deposition conditions for the reproducible formation of self-assembled molecular structures on gold-coated tips and substrates for atomic force microscopy. Preliminary data show that surface-saturated self-assembled monolayers form reproducibly on prolonged (>20 h) exposure of gold-coated glass substrates to ethanolic solutions of ω-functionalised alkanethiols in the concentration range 80-160 mmol dm-3. The data also show that exposure for 16 h to alkanethiol concentrations in the range 160-240 mmol dm-3 promote bilayer formation whereas concentrations of 240-320 mmol dm-3 result in the deposition of multilayers, the average orientation of which is parallel to that of the first molecular layer; the use of parent 1-undecanethiol solutions at concentrations of 1-80 mmol dm-3 results in incomplete monolayer coverage.

Original languageEnglish
Pages (from-to)1961-1968
Number of pages8
JournalApplied Surface Science
Volume256
Issue number6
DOIs
Publication statusPublished - 01 Jan 2010
Externally publishedYes

Keywords

  • Alkanethiols
  • Atomic force microscopy
  • Infrared spectroscopy
  • Multilayer deposition
  • Self-assembly
  • Surface energy

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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