Fig. 3. Mechanical stability of the hybrid electrode. (A) The relationship between transmittance at 550 nm and the sheet resistance of the Ag NNs, (B) the visible transmittance spectra of the Ag NNs vs. different R_s values. (C) The mechanical flexibility test of ITO, the Ag NNs and the WO₃/Ag NN/PEDOT:PSS hybrid film on a PET substrate after 5000 bending cycles at a radius of 0.5 cm. (D) The R_s values of the WO₃/Ag NN/PEDOT:PSS film on Ecoflex as a function of tensile strain. (E) Photographs of the WO₃/Ag/PEDOT:PSS/WO₃ hybrid film connected in series with a green light-emitting diode when flattened (left) and forcible twisting (right).