| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 10618700 | Synthetic Metals | 2005 | 5 Pages |
Abstract
Volume changes of polypyrrole doped with poly(styrene sulfonate) (PPy/PSS) during redox switching were investigated in an aqueous solution of CsClO4, utilizing electrochemical scanning tunneling microscopy (EC-STM). PPy/PSS was synthesized on a micropatterned Au substrate for the quantitative measurement of volume changes with doping. It was found that the polymer volume is greatly increased due to solvent swelling and the magnitude of anisotropic volume changes during redox switching ranges from â0.95 to 15.5%, depending on the film thickness. The potential cycling between â0.7 and +0.1Â V (versus Ag wire) also revealed that the PPy/PSS volume is not linearly related to the potential. The volume decreases with doping up to â0.05Â V and begins to rise above â0.05Â V.
Related Topics
Physical Sciences and Engineering
Materials Science
Biomaterials
Authors
Myoungho Pyo, Chee-Hun Kwak,