ESR measurements have been performed on the polyacenic material prepared by the pyrolytic treatment of phenol-formaldehyde resin. Six kinds of samples (A)-(F) with various electrical conductivity (σ) were employed for the measurements. Each sample shows a single narrow line, the g-values of which suggest the existence of unpaired electrons of π-type. If the sample (F) (σ = 1 × 10° S cm-1) the single narrow line becomes drastically diminished in the presence of a small amount of oxygen.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry