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(A) SEM image of electrospun TiO2 nanofibers. (B) SEM image of TiO2-PEDOT nanocables after the vapor phase polymerization of PEDOT on TiO2 nanofibers. (C) and (D) Histograms showing the size distribution of TiO2 nanofibers and TiO2-PEDOT nanocables, respectively.