Electronic and Ionic Transport in Processable Conducting Polymers
Abstract
EPR spectroscopy/electrochemical measurements have shown polaron and bipolaron states in the redox switching of poly(di-2-thienylphenylenes) substituted with alkoxy groups. The longer side chains stabilize the polaronic form of the polymers. In aqueous perchlorate and tetrafluoborate electrolytes, pyrrole electropolymerizes using only ca. 0.1 electrons per monomer. This suggests that in these cases a chain-growth polymerization is occurring rather than the more typical cation-radical coupling. Continued studies on our Pt/ polypyrrole nanocomposites (a 3-dimensional array of catalytically active colloidal Pt particles in a polypyrrole matrix) has demonstrated unusual catalytic activity toward O2 and H2. A new modified extended Huckel band structure calculation method has been developed which reproduces band gaps of polyheterocycles to within 0.4 eV. A new soluble derivative of poly(thieno(3,4- b)pyrazine) with a solution band gap of 1.1 eV and which changes color from dark blue to light yellow upon doping has been prepared.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 21, 1991
- Accession Number
- ADA242258
Entities
People
- Dennis S. Marynick
- John R. Reynolds
- Krishnan Rajeshwar’
- Martin Pomerantz
Organizations
- University of Texas at Arlington