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. 2017 Mar 18;7(1):16. doi: 10.3390/membranes7010016

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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TEM and SEM images of raw CNTs (1) and functionalized CNTs (2) after different functionalization methods: (a) non-covalent modification [45] and (b) covalent modification [46].