Electrical and Electrochemical Characterization of Electroconductive PPy-p(HEMA) Composite Hydrogels

Sean Brahim, Gymama Slaughter, Anthony Guiseppi-Elie

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations

Abstract

Two groups of polymers that have been the focus of widespread research are hydrogels and conducting electroactive polymers (CEPs). 'Intelligent' hydrogels are highly hydrophilic, cross-linked polymers possessing hydration properties that change in response to specific environmental stimuli such as pH, ionic strength, chemical species, magnetic fields, etc. Conducting electroactive polymers such as polypyrrole, polyaniline and polythiophene are highly conjugated, redox-active polymers with electrical and optical properties that change through many orders of magnitude depending upon redox state (doping). We have formed composites of inherently conductive polypyrrole within highly hydrophilic poly(hydroxyethyl methacrylate)-based hydrogels. These materials retain the hydration characteristics of hydrogels as well as the electroactivity and electronic conductivity of CEPs and are thus called 'electroconductive hydrogels'. The electrical and electrochemical properties of these polymer composites have been investigated. The electrochemical characteristics observed by cyclic voltammetry suggest less facile reduction of PPy within the composite hydrogel compared to electropolymerized PPy, as shown by the shift in the reduction peak potential from -472 mV for electropolymerized polypyrrole to -636 mV for the electroconductive composite gel. The network impedance magnitude for the electroconductive hydrogel remains quite low, ca. 100 Ohms, even upon approach to DC, over all frequencies and at all offset potentials suggesting retained electronic (bipolaronic) conductivity within the composite.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5053
DOIs
StatePublished - 2003
EventPROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Smart Structures and Materials 2003 Active Materials: Behavior and Mechanics - San Diego, CA, United States
Duration: Mar 3 2003Mar 6 2003

Keywords

  • Cyclic voltammetry
  • Electroactive polymers
  • Electrochemical impedance spectroscopy
  • Electroconductive
  • Hydrogel
  • Polymer composites
  • Polypyrrole

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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