Fig. 1. Characterization of ZnONPs; UV-visible spectrum (A) of green synthesized ZnO-NPs (0.1% w/v; solid line) and its comparison with commercially available ZnO-NPs (dashed line) which confirms the purity of ZnONPs. SEM analysis of ZnO-NPs at a direct magnification of ×10 000 (B) and ×50 000 (C). EDX spectrum of ZnONPs (D) and the TEM micrograph of at ×60 000 (E) with an average diameter of 33.5 ± 6.5. The inset in panel B depicts the morphology of ZnO-NPs. Panel F shows the X-ray diffractogram of ZnO nanopowder. The average crystal size by XRD was found to be 26.3 nm.