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C 2017, 3(2), 17; doi:10.3390/c3020017

Catalyst Residue and Oxygen Species Inhibition of the Formation of Hexahapto-Metal Complexes of Group 6 Metals on Single-Walled Carbon Nanotubes

1
Department of Chemistry, Rice University, Houston, TX 77005, USA
2
Department of Materials Science and Nanoengineering, Rice University, Houston, TX 77005, USA
3
Energy Safety Research Institute, Swansea University Bay Campus, Swansea SA2 8QQ, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Alvin Orbaek White
Received: 16 April 2017 / Revised: 10 May 2017 / Accepted: 16 May 2017 / Published: 26 May 2017
View Full-Text   |   Download PDF [6498 KB, uploaded 26 May 2017]   |  

Abstract

The reaction of Group 6 metals with SWCNT has the potential to bridge the resistive SWCNTSWCNT junctions by the formation of “Cr(SWCNT)2” complexes analogous to Cr(C6H6)2. This study reports that the formation of such species is very sensitive to oxidation by a residual iron oxide catalyst used for the growth of the SWCNTs and adsorbed/bound oxygen functionality. The reaction of raw HiPco SWCNTs with M(CO)6 and (C7H8)M(CO)3 (M = Cr, W) or (C6H6)Cr(CO)3 results in the formation of the Group 6 metal oxides. Annealing and acid treating the HiPco SWCNTs to reduce the catalyst content allows for the observation of zero valent metals by XPS, while the use of very high purity SWCNTs and graphene allows for the addition of primarily zero valent Group 6 metals, including the bis-hexahapto metal complex. View Full-Text
Keywords: chromium; tungsten; carbon nanotube; graphene; XPS chromium; tungsten; carbon nanotube; graphene; XPS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wright, K.D.; Barron, A.R. Catalyst Residue and Oxygen Species Inhibition of the Formation of Hexahapto-Metal Complexes of Group 6 Metals on Single-Walled Carbon Nanotubes. C 2017, 3, 17.

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