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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
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New insights into the substrate-plasma polymer interface.

Rodney T Chen1, Benjamin W Muir, Lars Thomsen

  • 1Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria, Australia.

The Journal of Physical Chemistry. B
|May 6, 2011
PubMed
Summary

A novel delamination technique allows easy analysis of plasma polymer (PP) film undersides. This method reveals heterogeneous film structures and differing chemical compositions between the top and underside surfaces of PP thin films.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Science

Background:

  • Characterizing the substrate interface of plasma polymer (PP) thin films is crucial for understanding film formation.
  • Traditional methods for analyzing the underside of thin films can be complex and destructive.
  • The interface chemistry significantly influences the overall properties and performance of PP thin films.

Purpose of the Study:

  • To introduce a simple and effective method for characterizing the underside (substrate interface) of plasma polymer thin films.
  • To analyze the chemical composition and structure of the top and underside surfaces of PP films.
  • To gain insights into the film formation mechanisms and chemistry of PP thin films.

Main Methods:

  • Developed a delamination technique using a sodium chloride (NaCl) single crystal substrate for easy separation of PP thin films.
  • Deposited two types of PP films: 1-bromopropane (BrPP) and allylamine (AAPP).
  • Analyzed the top and underside surfaces using X-ray photoelectron spectroscopy (XPS) and synchrotron-based near edge X-ray adsorption fine structure (NEXAFS) spectroscopy.

Main Results:

  • The delamination technique successfully separated PP films from the NaCl substrate.
  • Both BrPP and AAPP films exhibited heterogeneous structures with distinct chemical compositions on their top and underside surfaces.
  • The underside surfaces showed higher oxygen concentrations, while the topsides had higher levels of unsaturated species.

Conclusions:

  • The delamination method provides a straightforward approach to study the early stages of plasma polymer thin film chemistry.
  • The findings highlight significant differences in chemical composition between the top and underside of PP films, offering insights into their formation.
  • This technique opens new avenues for investigating the fundamental mechanisms of plasma polymer thin film deposition using diverse monomers.