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SEM images of ZnO products synthesised from zinc acetylacetonate hydrate with the Zn/HEPES molar ratio of 1:2 under different pH values: 7.4 (a,b); 8.4 (c,d); 9.4 (e,f). Products synthesised by the microwave and ultrasonic wave combined method. Reprinted from [844], Copyright (2013), with permission from Elsevier [OR APPLICABLE SOCIETY COPYRIGHT OWNER]. All rights reserved. In order to re-use permission must be obtained from the rightsholder.
