Colloid probe AFM and XPS study of time-dependent aging of amine plasma polymer coating in aqueous media

Anna Tarasova, Paul Hamilton-Brown, Thomas Gengenbach, Hans J. Griesser, Laurence Meagher

Research output: Contribution to journalArticleResearchpeer-review

39 Citations (Scopus)

Abstract

Effects of surface oxidation on the properties of amine plasma polymer (pp) films in aqueous media have not been widely studied, despite their use to control bio-interfacial properties. Changes in the surface composition of allylamine and heptylamine pp films, on water exposure, were followed by XPS. The surface potential was monitored via AFM measurements and comparison to DLVO theory. Analysis of XPS data implied high initial oxidation rates (rapid quenching of surface radicals). Oxidation of the pp films followed evolution of carbon-based rather than nitrogen-based species. Analysis of AFM force data showed changes in the sign of the surface potential with aging from positive to negative. Implications, for example for surface immobilization of molecules in aqueous environments, are also discussed. A graph is presented.

Original languageEnglish
Pages (from-to)175-185
Number of pages11
JournalPlasma Processes and Polymers
Volume5
Issue number2
DOIs
Publication statusPublished - 1 Feb 2008
Externally publishedYes

Keywords

  • Ageing
  • Amine
  • Atomic force microscopy (AFM)
  • Plasma polymerization
  • Surface charge
  • X-ray photoelectron spectroscopy (XPS)

Cite this