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The electron spin resonance (ESR) spectral change of Li-doped polyacenic semiconductive (PAS) materials has been examined before and after heat treatment to elucidate the decrease in the discharging amount of the heat-treated Li-doped PAS electrodes. Decrease in the peak-to-peak line width of the ESR lineshape has been observed for all the Li-doped PAS electrodes, indicating partial degradation of...
The fractal dimensions D of the pristine and the Li-doped polyacenic semiconductive (PAS) materials have been analyzed by small-angle X-ray scattering (SAXS) and compared with that of graphite. It has become clear that the Li doping generally makes D smaller, which suggests fixation effect of the nanopores on the surface of the material by the doped Li atoms. It is pointed out that the fractal dimension...
Porous carbon films were prepared by the pyrolysis of poly(urethane-imide) films that were prepared by a reaction between phenol-terminated polyurethane prepolymer and poly(amide acid) obtained from pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA). Upon thermal treatment of the poly(urethane-imide) films at 300 to 400 o C, the thermally less stable urethane domains decomposed, leaving...
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