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(a–d) SEM images of a layer of TiO2 nanotubes formed by the anodization of Ti foil in a glycol fluoride solution at 25 V covered by various amounts of Ag: (a,b) 0.01 mg·cm−2, (c,d) 0.06 mg·cm−2. (e) The diagram presenting the dependence between applied anodic voltage and the diameter of formed nanotubes. Reprinted with permission from [19]. Copyright 2010 Elsevier.
