Abstract
Positron annihilation spectroscopy and conductivity measurements have been used to probe aging-induced changes in parahydroxybenzenesulfonate doped polypyrrole. Polypyrrole was synthesized by a chemical oxidation process and aged in air at 110°C and 140°C up to 250 days. Positron annihilation experiments reveal modifications of the electronic structure accompanied by a dramatic loss of conductivity as a function of the aging time and temperature. The electron-positron momentum distribution at the 511 keV annihilation peak exhibits a strong shift towards higher momentum annihilation events upon aging. The experimental results are explained in terms of positron trapping in the vicinity of negative dopants whose concentration is reduced after aging.
| Original language | English |
|---|---|
| Pages (from-to) | 383-384 |
| Number of pages | 2 |
| Journal | Synthetic Metals |
| Volume | 101 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jan 1999 |
| Externally published | Yes |
| Event | Proceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) - Montpellier Duration: 12 Jul 1998 → 18 Jul 1998 |