Figure 3

(a) A HAADF-STEM image of FIB-TEM specimen of OTZ3-1 CsMP. (b) Magnified HAADF-STEM image of the area indicated by the arrow in (a). (c) HAADF-STEM image (labeled as ADF) and the elemental map of the area displayed in (b). (d) STEM-EDX spectrums of the area indicated by the yellow square in (b). (e) Magnified HAADF-STEM image of the dark contrast zone represented as edx1 in (b) associated with elemental maps. (f) HRTEM image of the Zn–Fe-oxide nanoparticle. The lattice fringe of 2.9 Å corresponds to (220).