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SEM images of annealed ZnO nanopowders after annealing at 800 °C in synthetic air: (a) undoped, (b) doped with 1 mol% of Co2+, (c) 5 mol% of Co2+, (d) 10 mol% of Co2+, and (e) 15 mol% of Co2+ ions. Reprinted with permission from [798], Copyright ©2015 Wojnarowicz et al., Article licensed under a CC BY 2.0.
