Effect of Synthesis Temperature in the Structure, Doping Level and Charge-Transport Properties of Polypyrrole
COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY
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Polypyrrole perchlorate was chemically synthesized at various temperatures and the resulting polymers were investigated by elemental analysis, fourier transform infrared spectroscopy FTIR, X-ray photoelectron spectroscopy XPS and conductivity measurements. A correlation between conductivity, doping level and synthesis temperature was observed. The doping level of the polymer is higher when the synthesis is conducted at lower temperature exhibit longer conjugation length, fewer structural defects, higher charge carrier hopping frequency and higher conductivity. Furthermore, the results of this study indicate that the positive charges of doped polypyrrole are preferentially localized on the nitrogen atoms which are adjacent to the doping anions, as opposed to being uniformly delocalized along the polymer backbone.
- Polymer Chemistry
- Electricity and Magnetism
- Atomic and Molecular Physics and Spectroscopy
- Solid State Physics