Recording stretching response of single polymer chains adsorbed on solid substrates

Lucie Grebikova, Milad Radiom, Plinio Maroni, A. Dieter Schlüter, Michal Borkovec*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)

Abstract

Various techniques to measure the force-extension relationship of individual polymer chains with the atomic force microscope (AFM) are compared. Reliable stretching force profiles can be obtained with the nano-handling technique, which involves imaging of the measured individual polymer molecules prior and after the force experiment. Results originating from the classical pulling technique, which relies on dense adsorbed polymer layers, must be interpreted with care. Comparison with the nano-handling technique reveals that the stretching response of individual molecules can be obtained with the pulling technique, provided the adsorbed polymer layer is dilute. For denser adsorbed layers, such experiments may not reflect the correct stretching response. The discrepancies seem to be related to polymer–polymer interactions and entanglements within the adsorbed layer. AFM imaging of the adsorbed layers can provide an indication concerning the relevance of such entanglement effects. Similar caveats apply to fishing experiments, where polymers are adsorbed to the AFM tip and not to the substrate.

Original languageEnglish
Pages (from-to)350-362
Number of pages13
JournalPolymer
Volume102
DOIs
Publication statusPublished - 12 Oct 2016
Externally publishedYes

Keywords

  • Atomic force microscopy
  • Dendronized polymers
  • Force spectroscopy
  • Polymer elasticity
  • Single molecule

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