Nanoadhesion on rigid methyl-terminated biphenyl thiol monolayers: A high-rate dynamic force spectroscopy study

Hubert Gojzewski, Michael Kappl, Gunnar Kircher, Wojciech Koczorowski, Hans Jürgen Butt, Arkadiusz Ptak*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

Nanoadhesion on a self-assembled monolayer of 4-methyl-4′- mercaptobiphenyl is measured using a modified atomic force microscope. The dependence of the adhesion force on the loading rate is analyzed with the Dudko-Hummer-Szabo model, and the kinetic and interaction potential parameters for a single terminal group are extracted. The energy and location of the activation barrier suggest that the adhesion is dominated by van der Waals dispersion forces. The humidity effect on the nanoadhesion is also studied. The results are compared with previously measured values for methyl-terminated alkane thiols and the influence of the thiol rigidity on the adhesion force is discussed.

Original languageEnglish
Pages (from-to)543-549
Number of pages7
JournalChemPhysChem
Volume14
Issue number3
DOIs
Publication statusPublished - 25 Feb 2013
Externally publishedYes

Keywords

  • Adhesion
  • Force spectroscopy
  • Humidity
  • Self-assembled monolayers (SAMs)
  • Thiols

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