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 language | English |
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Pages (from-to) | 543-549 |
Number of pages | 7 |
Journal | ChemPhysChem |
Volume | 14 |
Issue number | 3 |
DOIs | |
Publication status | Published - 25 Feb 2013 |
Externally published | Yes |
Keywords
- Adhesion
- Force spectroscopy
- Humidity
- Self-assembled monolayers (SAMs)
- Thiols