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. 2012 Feb 27;12(3):2610–2631. doi: 10.3390/s120302610

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© 2012 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 license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

Figure 8. — (a) FESEM images of the purified MWCNTs, (b) SnO₂/MWCNT nanocomposites and (c,d) porous SnO₂ nanotubes. Reprinted with permission from [88]. Copyright (2009) American Chemical Society.