In situ scanning tunneling microscopy study on volume change of polypyrrole/poly(styrene sulfonate)

Volume changes of polypyrrole doped with poly(styrene sulfonate) (PPy/PSS) during redox switching were investigated in an aqueous solution of CsClO 4, utilizing electrochemical scanning tunneling microscopy (EC-STM). PPy/PSS was synthesized on a micropatterned Au substrate for the quantitative measu...

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Bibliographic Details
Published in:Synthetic metals 2005-04, Vol.150 (2), p.133-137
Main Authors: Pyo, Myoungho, Kwak, Chee-Hun
Format: Article
Language:English
Subjects:
Applied sciences
Electrical, magnetic and optical properties
Exact sciences and technology
Film thickness
Organic polymers
Physicochemistry of polymers
Polypyrrole
Properties and characterization
Scanning tunneling microscopy
Volume change
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Summary:Volume changes of polypyrrole doped with poly(styrene sulfonate) (PPy/PSS) during redox switching were investigated in an aqueous solution of CsClO 4, 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 −0.95 to 15.5%, depending on the film thickness. The potential cycling between −0.7 and +0.1 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 −0.05 V and begins to rise above −0.05 V.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2005.01.022