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SEM images of ZnO NPs synthesis products obtained from the 4% H2O precursor, for synthesis durations of (a) 6 min; (b) 7.5 min; (c) 10 min; (d) 15 min; (e) 20 min; (f) 25 min, respectively. Republished with permission of ©IOP Publishing Ltd from [402], Copyright (2018), permission conveyed through Copyright Clearance Center, INC. All rights reserved. In order to re-use permission must be obtained from the rightsholder.
