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Materials 2013, 6(8), 3064-3078; doi:10.3390/ma6083064
Article

Enrichment of Large-Diameter Single-Walled Carbon Nanotubes (SWNTs) with Metallo-Octaethylporphyrins

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1 Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China 2 Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka 1000, Bangladesh 3 Department of Chemistry, Shiga University of Medical Science, Seta, Otsu 520-2192, Japan
* Author to whom correspondence should be addressed.
Received: 25 March 2013 / Revised: 2 July 2013 / Accepted: 16 July 2013 / Published: 24 July 2013
(This article belongs to the Special Issue Carbon Nanotubes)
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Abstract

We report here a detailed experimental investigation on noncovalent functionalization of single-walled carbon nanotubes (SWNTs) with four different metallo-octaethylporphyrins (MOEPs). It has been found that the identity of the center metal of MOEP strongly influences the solubilization of SWNTs. MnOEPs and ZnOEPs successfully extracted SWNTs in methanol, as confirmed by absorption spectroscopy, while CoOEPs and CuOEPs were not able to extract SWNTs at all. Atomic force microscopy (AFM) studies revealed that large SWNTs bundles could be exfoliated into either individual SWNTs or very small bundles by complexation with ZnOEP molecules. As for enrichment of SWNTs, ZnOEPs and MnOEPs show similar diameter discrimination ability toward 76-CoMoCAT, providing the extracted SWNTs with relatively large diameters.
Keywords: single-walled carbon nanotubes; metallo-octaethylporphyrins; complexation; enrichment single-walled carbon nanotubes; metallo-octaethylporphyrins; complexation; enrichment
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.

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Li, Y.; Rahman, A.F.M.M.; Liu, G.; Xiong, Z.; Koezuka, K.; Xu, Z.; Komatsu, N.; Wang, F. Enrichment of Large-Diameter Single-Walled Carbon Nanotubes (SWNTs) with Metallo-Octaethylporphyrins. Materials 2013, 6, 3064-3078.

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