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Hierarchically porous carbon membranes containing designed nanochannel architectures obtained by pyrolysis of ion-track etched polyimide

Muench, Falk and Seidl, Tim and Rauber, Markus and Peter, Benedikt and Brötz, Joachim and Krause, Markus and Trautmann, Christina and Roth, Christina and Katusic, Stipan and Ensinger, Wolfgang (2014):
Hierarchically porous carbon membranes containing designed nanochannel architectures obtained by pyrolysis of ion-track etched polyimide.
In: Materials Chemistry and Physics, Elsevier Science Publishing, pp. 846-853, 148, (3), [Online-Edition: http://www.sciencedirect.com/science/article/pii/S0254058414...],
[Article]

Abstract

Well-defined, porous carbon monoliths are highly promising materials for electrochemical applications, separation, purification and catalysis. In this work, we present an approach allowing to transfer the remarkable degree of synthetic control given by the ion-track etching technology to the fabrication of carbon membranes with porosity structured on multiple length scales. The carbonization and pore formation processes were examined with Raman, Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurements, while model experiments demonstrated the viability of the carbon membranes as catalyst support and pollutant adsorbent. Using ion-track etching, specifically designed, continuous channel-shaped pores were introduced into polyimide foils with precise control over channel diameter, orientation, density and interconnection. At a pyrolysis temperature of 950 °C, the artificially created channels shrunk in size, but their shape was preserved, while the polymer was transformed to microporous, amorphous carbon. Channel diameters ranging from ~10 to several 100 nm could be achieved. The channels also gave access to previously closed micropore volume. Substantial surface increase was realized, as it was shown by introducing a network consisting of 1.4 x 1010 channels per cm2 of 30 nm diameter, which more than tripled the mass-normalized surface of the pyrolytic carbon from 205 m2 g-1 to 732 m2 g-1. At a pyrolysis temperature of 3000 °C, membranes consisting of highly ordered graphite were obtained. In this case, the channel shape was severely altered, resulting in a pronounced conical geometry in which the channel diameter quickly decreased with increasing distance to the membrane surface.

Item Type: Article
Erschienen: 2014
Creators: Muench, Falk and Seidl, Tim and Rauber, Markus and Peter, Benedikt and Brötz, Joachim and Krause, Markus and Trautmann, Christina and Roth, Christina and Katusic, Stipan and Ensinger, Wolfgang
Title: Hierarchically porous carbon membranes containing designed nanochannel architectures obtained by pyrolysis of ion-track etched polyimide
Language: English
Abstract:

Well-defined, porous carbon monoliths are highly promising materials for electrochemical applications, separation, purification and catalysis. In this work, we present an approach allowing to transfer the remarkable degree of synthetic control given by the ion-track etching technology to the fabrication of carbon membranes with porosity structured on multiple length scales. The carbonization and pore formation processes were examined with Raman, Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurements, while model experiments demonstrated the viability of the carbon membranes as catalyst support and pollutant adsorbent. Using ion-track etching, specifically designed, continuous channel-shaped pores were introduced into polyimide foils with precise control over channel diameter, orientation, density and interconnection. At a pyrolysis temperature of 950 °C, the artificially created channels shrunk in size, but their shape was preserved, while the polymer was transformed to microporous, amorphous carbon. Channel diameters ranging from ~10 to several 100 nm could be achieved. The channels also gave access to previously closed micropore volume. Substantial surface increase was realized, as it was shown by introducing a network consisting of 1.4 x 1010 channels per cm2 of 30 nm diameter, which more than tripled the mass-normalized surface of the pyrolytic carbon from 205 m2 g-1 to 732 m2 g-1. At a pyrolysis temperature of 3000 °C, membranes consisting of highly ordered graphite were obtained. In this case, the channel shape was severely altered, resulting in a pronounced conical geometry in which the channel diameter quickly decreased with increasing distance to the membrane surface.

Journal or Publication Title: Materials Chemistry and Physics
Volume: 148
Number: 3
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Etching, Heat treatment, Microporous materials, Polymers, Surface properties
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 15 Dec 2014 14:23
Official URL: http://www.sciencedirect.com/science/article/pii/S0254058414...
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