Study On Flexible Thin Film Electrode Of CP Composite Materials

The discovery of conducting polymer has opened a new study field and application area of these materials. The Poly(3,4-ethylene–dioxythiophene): Polysty renesulfonate(PEDOT:PSS) has become a research focus of conducting polymer materials, owing to its characteristics of good electrical conductivity, easy coating of large films, high environmental stability, high visible light transmittance and pollution–free fabrication. In this work, the fabrication and doping modification of PEDOT:PSS thin films were studied.The main study works are shown as follows:(1) By the orthogonal experimental design, the effects of electrostatic spinning process conditions on film transmittance were investigated. Meanwhile the optimum process conditions of electrospinning were determined, which the voltage is 17 k V, the collector distance is 13 cm, spinning needle uses No.8 type, the electrospinning time is 14 minutes.The electric field distribution was analyzed by ANSYS simulation software. The influence of heat treatment temperature on film electrical conductivity was studied, and it is concluded that the optimal heat treatment temperature was 120 ℃.The PEDOT:PSS thin film with a high diffusive transmittance of 89.37% and a low sheet resistance of 49 Ω/sq was successfully fabricated under non-vacuum process conditions. The SEM images of PEDOT:PSS thin film shown that PEDOT:PSS was smooth and compact, with pore–free and cluster-free structure.(2) The MWCNTs were doped to modify the properties of the PEDOT:PSS. To improve the water dispersibility, MWCNTs were acidified before doping. The PEDOT:PSS/MWCNTs composite films with different MWCNTs doping amount were successfully prepared.The experimental results shown that the MWCNTs doping improved the electrical conductivity of PEDOT:PSS but decrease the light transmittance.The optimal doping amount of MWCNTs was 0.5%(mass percent). The experimental results also indicated that the square resistance of PEDOT:PSS thin film on glass basement membrane was always less than that on PET basement membrane.The square resistance with 0.5% MWCNTs doping amount were 309.70 Ω/□ on glass basement and 341.50 Ω/□ on PET basement respectively. The UV test results shown that the light absorption of MWCNTs and the resistance of network structure made the light transmittance of PEDOT:PSS/MWCNTs composite films decrease to 45.28%.(3) Silver paste was doped to modify the behavior of PEDOT:PSS thin film. Silver paste was diluted by xylene with the dilution ratio VAg:Vxylene =1:1.5. The effect of ultrasonic time on silver particle size was studied.The statistics results shown that the silver particle size decrease and then increase with ultrasonic time increased. The PEDOT:PSS/Ag, PEDOT:PSS/Ag/PEDOT:PSS and Ag/PEDOT:PSS composite films were successfully prepared by electrospinning. The composite PEDOT:PSS film shown strong absorption in the visible band with lower light transmittance and improvement of electric conductive performance.