| 초록 |
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is promising conducting polymer in terms of its application to electronic device. Generally, PEDOT:PSS is polymerized by oxidative polymerization in aqueous state. In polymerization, sodium persulfate and Iron(III)sulfate are used as oxidants and remain as ions after polymerization. These ions, especially sodium ions, decrease electrical properties and colloidal stability. In this study, we reduced sodium ions to about 20ppm by ultra-filtration (UF). The electrical properties of PEDOT:PSS films are investigated with XPS, UPS, Raman spectroscopy and AFM. Further, the influence of sodium ions on colloidal stability is analyzed by viscosity change. And we finally obtained that removing sodium ions process is important for electrical property and colloidal stability of PEDOT:PSS. |
