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. 2018 Nov 2;23(11):2854. doi: 10.3390/molecules23112854

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© 2018 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/).

PMC Copyright notice

TEM images of (a) hollow poly(O-anisidine) (POA), reprinted with permission from [81]. Copyright IOP Publishing, 2011 and (b) POA/silica core/shell structure, reprinted with permission from [82]. Copyright IOP Publishing, 2017.