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(a) SEM image of ZnO tubes (Reprinted from [868], Copyright (2005), with permission from Elsevier [OR APPLICABLE SOCIETY COPYRIGHT OWNER]); (b,c) SEM images of spherical Gd doped ZnO particles (own test results); (d–f) TEM images of Au-ZnO nanopyramids (Reprinted (adapted) with permission from [807]. Copyright © 2011, American Chemical Society). (a,d–f) All rights reserved. In order to re-use permission must be obtained from the rightsholder.
