.Briefly, the DA monomer and ZnOnanoparticles were co-dispersed in water assisted by an ultrasonication.The concentration of DA monomer was 0.5 mM while the ZnO/DA ratiowas 10 wt%.The DA/ZnO aqueous suspension was incubated at ∼4 °Cfor ∼24 h, followed by UV light irradiation (λ ∼ 254 nm, 10 W).Thephotopolymerization time was increased from 5 to 120 min, yielding ablue suspension of PDA/Zn2+/ZnO nanocomposite.The suspension wasfiltered through 1.2 μm pore size cellulose acetate membrane.Thinfilms were prepared by drop-casting the nanocomposite suspensiononto glass slides and drying in a vacuum oven overnight.Particle size of
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