Zinc oxide nanoparticles were synthesized by Beijing DK Nano Technology Co. Ltd. (Beijing, China) as reported previously (Liu et al., 2016, 2017; Zhao et al., 2016a,b; Ge et al., 2017). The characteristics of ZnO NPs (morphology, size, agglomeration, etc.) were determined by transmission electron microscopy (TEM; JEM-2100F, JEOL Inc., Japan) and dynamic light scattering (DLS) particle size analyzer (Nano-Zetasizer-HT, Malvern Instruments, Malvern, United Kingdom).
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