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SEM images of ZnO samples with the following molar ratios of urea/Zn2+ (a,b) 1:1, (c,d) 5:3, and (e,f) 3:1. Products synthesised by the microwave induced combustion process. Reprinted from [847], Copyright (2010), with permission from Elsevier [OR APPLICABLE SOCIETY COPYRIGHT OWNER]. All rights reserved. In order to re-use permission must be obtained from the rightsholder.
