| 초록 |
PEDOT:PSS is promising conducting polymer in terms of its transparency and flexibility. Generally, PEDOT:PSS is polymerized by oxidative polymerization using sodium persulfate and iron(III)sulfate as oxidants. After polymerization, these ions, especially sodium ions remain in aqueous state and decrease electrical properties and colloidal stability. In this study, we reduced sodium ions to about 20ppm by ion exchange resin before and after polymerization. The conformational changes of PEDOT:PSS are investigated with XPS, Raman spectroscopy and AFM. The electrical properties of PEDOT:PSS films ,such as conductivity and work-function are measured by 4-point probe, UPS. Further, the effect of sodium ions on colloidal stability of PEDOT:PSS solution is analyzed by viscosity change. And we finally investigate that sodium ions unremoved in PEDOT:PSS solution have a considerable effect on its electrical property and colloidal stability of PEDOT:PSS. |
