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(a) Growth of ZnO NWs on alumina substrate with Au electrodes; (b) transformation of ZnO NWs into CoO NWs; (c) growth of Co-doped branched ZnO NWs from CoO NWs; (d) transformation of ZnO NWs into NiO NWs; (e) growth of Ni-doped ZnO NWs from NiO NWs. Reproduced from [131,137] with permission; (a–c) [137] Copyright (2014) American Chemical Society; (d,e) [131] Copyright (2015) Elsevier.
