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Updated: Jul 5, 2026
09:09
Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
Published on: December 15, 2015
Perforated, freely suspended layer-by-layer nanoscale membranes
Dmitry Zimnitsky1, Valeriy V Shevchenko, Vladimir V Tsukruk
1Georgia Institute of Technology, School of Materials Science and Engineering, Atlanta, Georgia 30332, USA.
Summary
Researchers developed ultrathin, perforated membranes with uniform nanopores using spin-assisted layer-by-layer assembly. This fast method enables robust, suspended membranes for advanced separation applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Freely suspended membranes are crucial for various applications, including separation and filtration.
- Fabricating ultrathin membranes with controlled nanopores presents significant challenges.
Purpose of the Study:
- To develop a fast and simple method for fabricating ultrathin, perforated membranes with uniform nanopores.
- To investigate the control over nanopore size and membrane properties.
- To explore the potential of these membranes for ultrafine separation.
Main Methods:
- Spin-assisted layer-by-layer assembly on hydrophobic substrates.
- Controlled deposition of polyelectrolyte bilayers.
- Characterization of membrane thickness, nanopore size, and robustness.
Main Results:
- Fabrication of ultrathin (down to 20 nm) membranes with uniform nanopores (tens of nanometers).
- Demonstrated robustness for release, transfer, and suspension over openings.
- Nanopore size control achieved by tuning assembly parameters and substrate properties.
- Nanopore formation attributed to partial dewetting during deposition.
Conclusions:
- A novel, fast method for producing highly perforated, ultrathin membranes with tunable nanopores.
- These membranes offer high transport rates due to nanoscale thickness and high nanopore concentration.
- The developed membranes represent a promising platform for ultrafine separation and functionalization.
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