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Nanopatterned polymer brushes by reactive writing.

Jonas F Nawroth1, Claudia Neisser2, Artur Erbe2

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Summary

Reactive writing (RW) creates polymer brush patterns using electron beam damage and photopolymerization. This technique allows for precise control over polymer structures, expanding possibilities for surface functionalization.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Self-assembled monolayers (SAMs) are crucial for surface modification.
  • Electron beam induced damage is a known method for patterning SAMs.
  • Photografting and photopolymerization (SIPGP) enables polymer brush formation.

Purpose of the Study:

  • To introduce and investigate a novel technique called reactive writing (RW).
  • To demonstrate the formation of polymer brush gradients and lines using RW.
  • To optimize lithography parameters for efficient SAM modification.

Main Methods:

  • Utilizing electron beam induced damage on perfluorooctyltriethoxysilane SAMs (PF-SAM).
  • Applying self-initiated photografting and photopolymerization (SIPGP) for selective functionalization.
  • Systematically varying lithography parameters (acceleration voltage, irradiation dose, beam current, dwell time).

Main Results:

  • Successful formation of polymer brush gradients and single polymer lines with sub-100 nm dimensions.
  • High contrast patterns achieved on PF-SAM surfaces.
  • Identified optimal lithography conditions for SAM conversion into carbonaceous deposits.
  • Observed a dwell time dependency in RW, differing from carbon templating (CT) studies.

Conclusions:

  • Reactive writing (RW) is a versatile new technique for creating polymer brush patterns.
  • RW offers control over both polymer chemistry and substrate surface chemistry.
  • This method expands the capabilities of carbon templating for advanced surface engineering.