Journal article 723 views 48 downloads
Enhanced purification of carbon nanotubes by microwave and chlorine cleaning procedures / Virginia, Gomez; Charlie, Dunnill; Andrew, Barron
RSC Advances, Volume: 6, Issue: 14, Pages: 11895 - 11902
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We report a new two-step purification method of carbon nanotubes (CNTs) involving a microwave treatment followed by a gas-phase chlorination process. The significant advantage of this method over conventional cleaning carbon nanotubes procedures is that under microwave treatment in air, the carbon s...
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We report a new two-step purification method of carbon nanotubes (CNTs) involving a microwave treatment followed by a gas-phase chlorination process. The significant advantage of this method over conventional cleaning carbon nanotubes procedures is that under microwave treatment in air, the carbon shells that encase the residual metal catalyst particles are removed and the metallic iron is exposed and subsequently oxidized making it available for chemical removal. The products from microwave and chlorine treatment have been characterized. The oxidation state of the iron is observed to change from Fe(0) to Fe(II)/Fe(III) after microwave treatment and atmospheric exposure. The effects of the duration and number of microwave exposures has been investigated. This rapid and effective microwave step favors the subsequent chlorination treatment enabling a more effective cleaning procedure to take place, yielding higher purity single- and multi-walled CNTs.
International collaboration with University of Zaragoza (Spain) and Rice University (USA). Resulted in 14 news stories from 13 outlets. Used as the basis for 18 month US Office of Naval Research (email@example.com) research project with GE, USA (firstname.lastname@example.org) ($800,000). Used by Nanocomp (USA) for testing (JRust@nanocomptech.com). 25 citations in which the authors used the process, demonstrating the uptake of the method to general use. Resulted in 2 Patent applications with license to NoPo Inc, India (email@example.com) for commercial purification of CNTs for medical application in Japan and USA.