Figure 7From: The effect of ambient humidity on the electrical properties of graphene oxide filmsEquivalent circuits of the GO-film-functionalized IDE. (a) Semicircle-type impedance associated with the bulk impedance of GO films and (b) both semicircle-type impedance associated with the bulk impedance of GO films and straight line-type impedance (i.e., Warburg impedance) associated with GO-electrode interface.Back to article page