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Carbon Dioxide Plasma as a Versatile Medium for Purification and Functionalization of Vertically Aligned Carbon Nanotubes

Babu, Deepu J. and Yadav, Sandeep and Heinlein, Thorsten and Cherkashinin, Gennady and Schneider, Jörg J. (2014):
Carbon Dioxide Plasma as a Versatile Medium for Purification and Functionalization of Vertically Aligned Carbon Nanotubes.
In: The Journal of Physical Chemistry C, ACS Publications, pp. 12028-12034, 118, (22), ISSN 1932-7447, [Online-Edition: http://dx.doi.org/10.1021/jp5027515],
[Article]

Abstract

Three-dimensional (3D) architectures obtained by the structural assembly of 1D nanomaterials are regarded as the next generation building blocks for sensors, electronics, photonics, and bioelectronic applications. Purification and functionalization of such 3D ordered structures are crucial for realizing their full potential. Plasma functionalization, compared to any solution based process, is favorable in retaining the alignment while functionalizing such structures. However, the commonly employed plasma processes like O2 or Ar plasma can be highly detrimental to well-aligned ordered nanostructures and thus might affect the properties intimately associated with their 3D structure. Here, for the first time, we investigate the mild nature of a radio frequency CO2 gas plasma as an effective source for purification and functionalization of vertically aligned CNT structures and study the effects of this functionalization onto the purification and functionalization by physical and chemical techniques (HRTEM, XPS, Raman). We found that CO2 plasma selectively etches the amorphous carbon present in the vertically aligned CNT structure. Moreover, it is as effective as the widely used but more aggressive O2 plasma in functionalizing the CNT. Unlike an O2 or Ar plasma, CO2 plasma has the tremendous advantage of retaining the structural integrity of the CNT structures.

Item Type: Article
Erschienen: 2014
Creators: Babu, Deepu J. and Yadav, Sandeep and Heinlein, Thorsten and Cherkashinin, Gennady and Schneider, Jörg J.
Title: Carbon Dioxide Plasma as a Versatile Medium for Purification and Functionalization of Vertically Aligned Carbon Nanotubes
Language: English
Abstract:

Three-dimensional (3D) architectures obtained by the structural assembly of 1D nanomaterials are regarded as the next generation building blocks for sensors, electronics, photonics, and bioelectronic applications. Purification and functionalization of such 3D ordered structures are crucial for realizing their full potential. Plasma functionalization, compared to any solution based process, is favorable in retaining the alignment while functionalizing such structures. However, the commonly employed plasma processes like O2 or Ar plasma can be highly detrimental to well-aligned ordered nanostructures and thus might affect the properties intimately associated with their 3D structure. Here, for the first time, we investigate the mild nature of a radio frequency CO2 gas plasma as an effective source for purification and functionalization of vertically aligned CNT structures and study the effects of this functionalization onto the purification and functionalization by physical and chemical techniques (HRTEM, XPS, Raman). We found that CO2 plasma selectively etches the amorphous carbon present in the vertically aligned CNT structure. Moreover, it is as effective as the widely used but more aggressive O2 plasma in functionalizing the CNT. Unlike an O2 or Ar plasma, CO2 plasma has the tremendous advantage of retaining the structural integrity of the CNT structures.

Journal or Publication Title: The Journal of Physical Chemistry C
Volume: 118
Number: 22
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
07 Department of Chemistry > Fachgebiet Anorganische Chemie
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
07 Department of Chemistry
Date Deposited: 27 Feb 2015 10:32
Official URL: http://dx.doi.org/10.1021/jp5027515
Identification Number: doi:10.1021/jp5027515
Funders: This work was supported within the priority program SPP 1570 of the Deutsche Forschungsgemeinschaft, DFG. , We acknowledge additional financial support through the LOEWE Initiative STT (Sensors towards Terahertz) funded by the State of Hesse.
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