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Fabrication of nanoporous graphene/polymer composite membranes

Madauß, Lukas and Schumacher, Jens and Ghosh, Mandakranta and Ochedowski, Oliver and Meyer, Jens and Lebius, Henning and Ban-d'Etat, Brigitte and Toimil-Molares, Maria Eugenia and Trautmann, Christina and Lammertink, Rob G. H. and Ulbricht, Mathias and Schleberger, Marika (2017):
Fabrication of nanoporous graphene/polymer composite membranes.
In: Nanoscale, Royal Society of Chemistry, pp. 10487-10493, 9, (29), ISSN 2040-3364,
DOI: 10.1039/C7NR02755A,
[Online-Edition: https://doi.org/10.1039/C7NR02755A],
[Article]

Abstract

Graphene is currently investigated as a promising membrane material in which selective pores can be created depending on the requirements of the application. However, to handle large-area nanoporous graphene a stable support material is needed. Here, we report on composite membranes consisting of large-area single layer nanoporous graphene supported by a porous polymer. The fabrication is based on ion-track nanotechnology with swift heavy ions directly creating atomic pores in the graphene lattice and damaged tracks in the polymer support. Subsequent chemical etching converts the latent ion tracks in the supporting polymer foil, here polyethylene terephthalate (PET), into open microchannels while the perfectly aligned pores in the graphene top layer remain unaffected. To avoid unintentional damage creation and delamination of the graphene layer from the substrate, the graphene is encapsulated by a protecting poly(methyl methacrylate) (PMMA) layer. By this procedure a stable composite membrane is obtained consisting of nanoporous graphene (coverage close to 100%) suspended across selfaligned track-etched microchannels in a polymer support film. Our method presents a facile way to create high quality suspended graphene of tunable pore size supported on a flexible porous polymeric support, thus enabling the development of membranes for fast and selective ultrafiltration separation processes.

Item Type: Article
Erschienen: 2017
Creators: Madauß, Lukas and Schumacher, Jens and Ghosh, Mandakranta and Ochedowski, Oliver and Meyer, Jens and Lebius, Henning and Ban-d'Etat, Brigitte and Toimil-Molares, Maria Eugenia and Trautmann, Christina and Lammertink, Rob G. H. and Ulbricht, Mathias and Schleberger, Marika
Title: Fabrication of nanoporous graphene/polymer composite membranes
Language: English
Abstract:

Graphene is currently investigated as a promising membrane material in which selective pores can be created depending on the requirements of the application. However, to handle large-area nanoporous graphene a stable support material is needed. Here, we report on composite membranes consisting of large-area single layer nanoporous graphene supported by a porous polymer. The fabrication is based on ion-track nanotechnology with swift heavy ions directly creating atomic pores in the graphene lattice and damaged tracks in the polymer support. Subsequent chemical etching converts the latent ion tracks in the supporting polymer foil, here polyethylene terephthalate (PET), into open microchannels while the perfectly aligned pores in the graphene top layer remain unaffected. To avoid unintentional damage creation and delamination of the graphene layer from the substrate, the graphene is encapsulated by a protecting poly(methyl methacrylate) (PMMA) layer. By this procedure a stable composite membrane is obtained consisting of nanoporous graphene (coverage close to 100%) suspended across selfaligned track-etched microchannels in a polymer support film. Our method presents a facile way to create high quality suspended graphene of tunable pore size supported on a flexible porous polymeric support, thus enabling the development of membranes for fast and selective ultrafiltration separation processes.

Journal or Publication Title: Nanoscale
Volume: 9
Number: 29
Publisher: Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Dec 2017 11:58
DOI: 10.1039/C7NR02755A
Official URL: https://doi.org/10.1039/C7NR02755A
Funders: We acknowledge financial support from the DFG within the SPP 1459 Graphene (O. O.) and within the Project NU-TEGRAM (L. M., J. S., DFG Schl 384/16-1, UL 113/10-1)., M. E. Toimil-Molares and C. Trautmann thank the LOEWE project iNAPO funded by the Ministry of Higher Education, Research and the Arts (HMWK) of the Hessen state.
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