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(a) XRD peaks of Co3O4 rods, ZnO sheet, single-Co3O4 rods@ZnO sheet, double-Co3O4 rods@ZnO sheet, and triple-Co3O4 rods@ZnO sheet. (b) EDS mapping images of triple-Co3O4 rods@ZnO sheet. (c) SAED pattern of triple-Co3O4 rods@ZnO sheet. XPS spectra of triple-Co3O4 rods@ZnO sheet: (d) Zn 2p, and (e) Co 2p.
