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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

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Self-Patterning Polyelectrolyte Multilayer Films: Influence of Deposition Steps and Drying in a Vacuum.

Amir Azinfar¹, Sven Neuber¹, Marie Vancova^2,3

¹Institute of Physics, University of Greifswald, Felix-Hausdorff-Straße 6, D-17489 Greifswald, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 26, 2021

Summary

This study reveals that low molecular weight poly(styrenesulfonate) (PSS_short) enables self-patterning in polyelectrolyte multilayers. Mobile PSS_short drives the formation of surface structures like bands and domains as film thickness increases.

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Published on: January 17, 2018

Area of Science:

Materials Science
Polymer Science
Surface Chemistry

Background:

Lateral patterning of films is typically achieved through lithography, external fields, or copolymer self-assembly.
Polyelectrolyte multilayers (PEMs) offer an alternative route for fabricating patterned thin films.
Understanding self-assembly mechanisms in PEMs is crucial for controlled material fabrication.

Purpose of the Study:

To investigate the self-patterning phenomenon in poly(diallyldimethylammonium) (PDADMA)/poly(styrenesulfonate) (PSS_short) polyelectrolyte multilayers.
To determine the role of PSS molecular weight and mobility in initiating and controlling self-patterning.
To analyze the evolution of surface structures with film thickness and post-treatment.

Main Methods:

Fabrication of PDADMA/PSS_short multilayers with varying bilayer numbers.
Atomic Force Microscopy (AFM) for surface morphology analysis.
Scanning Electron Microscopy (SEM) for structural characterization after vacuum exposure.

Main Results:

Self-patterning initiated after seven bilayers of PDADMA/PSS_short, requiring mobile PSS_short (10.7 kDa).
Surface structures evolved from ribbing to bands and circular domains with increasing film thickness (70-250 nm spacing).
Vacuum exposure caused film thinning and increased domain spacing, with a more pronounced effect on PDADMA-terminated films.

Conclusions:

The mobility of low molecular weight PSS_short is essential for the self-patterning of PDADMA/PSS_short films.
Film thickness and termination layer influence the morphology and spacing of self-assembled domains.
Post-fabrication vacuum treatment alters film structure, highlighting the dynamic nature of these multilayers.