Figure 1.
Field-emission scanning electron microscopy (SEM) images of the two different sizes of Co3O4 nanoparticles (NPs). (A) 100,000× and (B–D) 200,000× for type A Co-NPs; (E) 20,000×, (F) 35,000×, (G) 45,000×, and (H) 50,000× for type B Co-NPs.
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