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Morphologies of CuO nanopowder synthesized via Sol-Gel at two pH values. At pH = 5.6, the aging times are: (a) 1 min, (b) 1 h, (c) 2 h, (d) 72 h. At pH = 7, the aging times are: (e) 1 min, (f) 1 h, (g) 2 h, (h) 72 h. Reprinted/adapted with permission from Ref. [28]. 2019, Springer Nature.
