Quartz Crystal Microbalance Study: Ionic Motion Across Conducting Polymers.

摘要

In-situ monitoring of mass change was performed during electro chemical growth and redox cycling of a conducting polymer (polypyrrole) on a quartz crystal microbalance. For the polypyrrole films grown with large polymeric anions (poly(4-styrenesulfonate) and poly-vinylsulfonate), mostly cations and solvent molecules were inserted and removed to compensate charge in polypyrrole. The films formed with medium sized anions (tosylate) showed both anion and cation motion during the redox process. The films prepared in the presence of small anions (clo4(-) and BF4(1) showed mostly anion motion, but cation motion also became significant for higher oxidation and/or reduction rate. (kr)