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Journal of Applied Physics : Ion transport in polyacetylene ionomers

By Fuding Lin, Yongjun Wang, and Mark Lonergan

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Book Id: WPLBN0002169357
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 19 November 2008

Title: Journal of Applied Physics : Ion transport in polyacetylene ionomers  
Author: Fuding Lin, Yongjun Wang, and Mark Lonergan
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Journal of Applied Physics Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Yongjun Wang, And Mark Lonerga, F. L. (n.d.). Journal of Applied Physics : Ion transport in polyacetylene ionomers. Retrieved from http://hawaiilibrary.net/


Description
Description: Ion transport in cationically and anionically functionalized polyacetylene ionomers, PAC and PAA, respectively, was investigated by analyzing the impedance responses of thin film Au∣ionomer∣Au sandwich configurations. Samples were measured over a frequency range of 10−2–106 Hz and a temperature range of 298–398 K. Electrode polarization at low frequencies and dispersion due to ion hopping at higher frequencies were observed. The impedance data were analyzed first without the reliance on a specific model, then through equivalent circuit modeling, to estimate the dc (bulk) ion conductivity σ0, ion hopping rate ωh, and dielectric constant of the polymer matrix. The dispersive ion hopping conduction was best modeled by a distributed process involving the Kohlrausch–Williams–Watts stretched exponential decay function. The ionic conductivity of both ionomers exhibited an Arrhenius dependence on temperature with similar activation energies: 0.94 eV for PAC and 0.97 eV for PAA. At 308 K, the ionic conductivity of PAC was measured to be 1.1×10−11 S/cm while that of PAA was measured to be 1.3×10−12 S/cm. The dielectric constant for the polymer matrix in the absence of ionic polarization was found to be ϵD = 4.5 for PAC and ϵD = 4.2 for PAA at 308 K. The assignment of the conductivity to ionic processes implies an extremely small intrinsic electronic conductivity in these polymeric semiconductors.

 

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