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. 2020 Jul 7;6(8):1431–1440. doi: 10.1021/acscentsci.0c00458

Figure 2.

Figure 2

Characterizations of doped ZnO solid solutions and the formation of the ZIF shell. The optical image (a) and XRD patterns (b) of pure ZnO and various doped ZnO samples. (c) XRD pattern of Co-doped ZnO@ZIF nanoparticles. (d) FTIR spectra of Co-doped ZnO nanoparticles, Co-doped ZnO@ZIF nanoparticles, and ZIF-8 nanocrystals. (e) N2 adsorption–desorption isotherms of Co-doped ZnO nanoparticles and Co-doped ZnO@ZIF nanoparticles. SEM image (f), TEM image (g), and HRTEM image (h) of Co-doped ZnO@ZIF nanoparticles. (i–n) HAADF-STEM image and the corresponding EDS elemental maps of Co-doped ZnO@ZIF nanoparticles for C, N, O, Zn, and Co.