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An Efficient Method to Completely Remove Catalyst Particles from HiPCO Single Walled Carbon Nanotubes

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Abstract:

An efficient, economic and easy method for removing 99% of catalyst particle from high pressure carbon monoxide (HiPCO) single walled carbon nanotubes (SWCNT) is reported. The experiment is carried out at low temperature followed by acid treatment. The process exploited here is oxidation of the carbon impurities to gaseous phase as CO2 and removal of oxidized catalyst debris using acid treatment. Stability of SWCNT at these temperatures does not allow any damage to the nanotubes, however, some damage is observed which can be attributed to the oxidation of catalyst particles and their removal. The purified sample showed very less/no amount of amorphous carbon and catalyst impurities. Characterization of the material was carried out using Raman spectroscopy, Thermogravimetric analysis (TGA), Scanning electron microscopy (SEM), Transmission electron microscope (TEM) and Energy Dispersive Spectroscopy (EDAX). The resultant SWCNT were found to be highly pure. EDAX spectroscopy showed that the purified sample had only 0.5wt% of catalyst impurities whereas the as prepared once have 9.09wt%, also, TGA curve of the treated sample showed a very significant increase in the oxidation temperature indicating less defect and less catalyst content in the sample. The non- carbonaceous residue after purification is about 0.3%. highly efficient purification of SWCNT using the proposed method. This work provides a basis on removing the catalyst particles completely.

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Journal of Nano Research Vol. 53 View Preview

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Periodical:

Journal of Nano Research (Volume 53)

Pages:

64-75

DOI:

https://doi.org/10.4028/www.scientific.net/JNanoR.53.64

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Online since:

June 2018

Authors:

M. Anto Godwin, Aparna Basavaraja Allannavar, Sarika Joshi, Gadhadar Reddy, S.S. Abhishek, Robert Kelley Bradley*

Keywords:

High Pure, HiPCO, Low Catalyst, Purification, SWCNT

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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