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(a) Precursors (zinc acetate, hexamethylenetetramine (HMT), and sodium hydroxide) used in the synthesis of different nZnO morphologies; auto-clave treatment at 90 °C was maintained for (b) 6 h to get nanoplatelets, (c) 12 h to achieve multibranched flower-like particles, and (d) 24 h to obtain nanorods. (e) Diagram of the antimicrobial activity test for the ZnO multibranched flower-like particles. Figure adapted with permission from Reference [129]. Copyright 2020 Elsevier.
