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(a) Scanning electron microscopy (SEM) image and (b) telectron microscopy (TEM) image of Mn–Zn–ZIF nanoparticles. (c) SEM image and (d) TEM image of Mn–Zn–ZIF–PEG nanoparticles. (e) Dark-field STEM images and EELS elements mapping of Mn–Zn–ZIF nanoparticles with well-distributed Mn, Zn, C, N, and O elements.
