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Fig. 1. The structural characterization of ZrO2 and M-MZNs. (A) TEM images of ZrO2 NPs and (B) TEM images of M-MZNs NPs, scale bars represent 100 nm. (C) SEM images of ZrO2 NPs and (D) SEM images of M-MZNs, scale bars represent 200 nm. (E) EDS of ZrO2 NPs and (F) EDS of M-MZNs.