August 28, 2022 to September 1, 2022
Serbian Academy of Sciences and Arts – SASA
Europe/Belgrade timezone

The influence of different polyaniline polymer and carbon material morphologies on electrical properties

S11-EPASE-102
Aug 29, 2022, 5:00 PM
15m
Hall 664 (Faculty of Physics)

Hall 664

Faculty of Physics

Board: S11-EPASE-102
Oral presentation S11 Environmental Physics – Alternative Sources of Energy S11 Environmental Physics – Alternative Sources of Energy

Speaker

Mr Tudor Şuteu (University of Bucharest)

Description

Polyaniline powders are prepared using two different reaction routes in order to obtain different morphologies. Using ammonium persulfate (APS) as a dopant and in a solution of ethanol and acetic acid, the polymerisation of aniline gave rise to tubular like nanostructures, thus the sample was named PANI-T. Similarly, PANI-R (polyaniline with a “round” morphology of nanostructures), was synthesized in a sulphuric acid solution and with APS as a dopant. 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 PANI-T-900 and PANI-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. The polymers PANI-R and PANI-T exhibit a typical semiconductor behaviour of their I-V curve, but the electrical conductance of PANI-R is a few orders of magnitude above the one of PANI-T. The measured values for the carbonic materials far exceed the ones of the polymers, entering the range of conductors. Out of the samples examined, PANI-T was the only one that exhibited a capacitive behaviour of the EIS Nyquist plot, while the other three showed an inductive one.

Primary author

Mr Tudor Şuteu (University of Bucharest)

Co-author

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