| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 105 === Transparent conductive films (TC films), which have good properties of optically transparent and electrically conductive, are widely used in touch screen, solar cell, flexible LCD and OLED. The conductive polymer is used as TC films, such as Poly(3,4-ethylenedioxythiophene): poly(styrene-4-sulfonate) (PEDOT:PSS). In this study, we used an easier method to mix the electrochemical exfoliated graphene (ECG) into PEDOT:PSS. The effects of graphene additives on optoelectronic properties of PEDOT:PSS were investigated. Electrochemical exfoliation method is widely applied due to high scalability and low production cost, especially it does not need complicatedly chemical reactions. We mixed the ECG powders into PEDOT:PSS. In this way, PEDOT molecular and ECG sheet were combined with π-π bond, and PSS chains bond on the functional group of ECG. These reactions decrease the Coulombic interaction between PEDOT and PSS, which induced phase separation and conformational change of PEDOT. It improved the conductivity of TC films so that the sheet resistance decreased from 0.36 kΩ/□ to 0.18 kΩ/□. In the electrical stability measurement, the sheet resistance of PEDOT:PSS TC films could not be measured after 60 days. The ATR-FTIR spectrum for PEDOT:PSS TC films were employed, where the C-H and O-H peaks were observed changed after 40 days. However, the sheet resistance of PEDOT:PSS/ECG can be measured after 270 days. The ATR-FTIR spectrum for PEDOT:PSS/ECG TC films showed no huge variation. We suppose that the changes of C-H and O-H are the key that makes PEDOT:PSS damaged. In conclusion, the effects of graphene additives promote the conductivity and stability of PEDOT:PSS.
|
|---|
