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Schematic diagrams of multilevel porosity in ZnO NPs and their self-assembled three-dimensional structures for enhancement of photocatalysis. Multilevel pores in (A) insect and (B) leaf branching systems, followed by Murray’s law, (C) lateral and (D) top views of hierarchically porous ZnO NP network model, (E) ZnO NP aggregates and (F) layer-by-layer structure network of ZnO NPs on a solid plate. Abbreviations: ZnO, zinc oxide; NPs, nanoparticles.
