A Bode-magnitude plot gives the extrapolation line to thelog Z axis at w = 1 (log w = 0) yielding the value of Cdlfrom the following equation. IZI = 1/Cdl[33] (Fig. 5b). The obtained Cdlval-ues are: Cdl= 0.19 mF cm−2for the PANI films, Cdl= 0.08 mF cm−2for the PANI/TiO2, Cdl= 0.07 mF cm−2for the PANI/Ag, andCdl= 0.14 mF cm−2for the PANI/Zn films. Obtaining different Cdlval-ues for different nanocomposite films in the Helmholtz plane showsthat using different AC frequencies produces different impedance values for the studied nanocomposite films and double layers in thesolution.