Electrochemically controlled swelling properties of nanoporous templated polypyrrole and layer by layer polypyrrole

Aysegul Aygun, Joseph W. Buthker, Larry D. Stephenson, Ashok Kumar, Thomas K. Mahle, Andrew A. Gewirth

Research output: Contribution to journalArticlepeer-review

Abstract

Electrochemically controlled swelling properties of polypyrrole (PPy) are investigated by comparing the performance of layer-by-layer (LbL) assembled and nanoporous templated (NT) systems. The swelling behavior was improved for the NT and LbL systems over that of unmodified PPy. Reversible swelling of about 20% in 120 s on the first cycle was measured with the NT PPy via the electrochemical quartz crystal microbalance (EQCM). The changes in the morphology and roughness that occur with swelling and shrinking were measured using in situ electrochemical atomic force microscopy (EC-AFM). Electrochemical impedance spectroscopy (EIS) measurements showed that both the LbL and NT systems exhibited increased surface area relative to unmodified PPy thin films. The understanding of the changes occurring due to molecular and nanostructural reconfiguration in response to electrochemical stimuli may lead to potential applications in the development of a new generation of smart materials, in particular, more effective switchable materials.

Original languageEnglish (US)
Pages (from-to)47-52
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume684
DOIs
StatePublished - Sep 15 2012

Keywords

  • Conducting polymers
  • EQCM
  • Layer-by-layer
  • Nanoporous
  • Polypyrrole

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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