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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:25 |
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Conference: Bucharest University Faculty of Physics 2022 Meeting
Section: Polymer Physics
Title:
The influence of different polypyrrole polymer and carbon material morphologies on electrical properties
Authors:
Tudor ȘUTEU (1), Anca DUMITRU (1)
Affiliation:
1) University of Bucharest, Faculty of Physics
E-mail
tudor.suteu2001@gmail.com
Keywords:
semiconducting polymers, polypyrrole, electrochemical impedance spectrscopy, conductivity, carbon materials, nanostructures
Abstract:
Polypyrrole powders are prepared using two different reaction routes in order to obtain different morphologies. Polypyrrole was “grown” on a fibrous complex of methyl-orange dye and FeCl3 template which enabled the pyrrole to assemble in tubular nanostructure. This sample was named PPY-T. The second approach consisted of a classic oxidative polymerization using ferrous chloride as the oxidizing agent and p-toluensulfonic acid as an anionic dopant to improve electrical conductivity. This second sample was indexed PPY-R. The different morphologies of the polymer species were confirmed using scanning electron microscopy (SEM). In order to obtain the carbonic materials, the polymers were raised to 900°C under N2 constant flow. X-Ray Diffraction (XRD) was used to confirm the transition from polymers to nitrogen containing carbon nanostructures, which were labelled PPY-T-900 and PPY-R-900. The study of the electrical conductivities was done by two approaches: I-V characteristics, and electrochemical impedance spectroscopy (EIS) on a broad range of frequencies. In order to extract the electrical resistances and, eventually the electrical conductivities, a Nyquist plot was used to fit the data from the EIS and identify the capacitive or inductive behaviour of the materials.
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