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Bombardment induced ion transport - Part III: Experimental potassium ion conductivities in poly(para-xylylene)

Title data

Schulze, S. ; Schäfer, M. ; Greiner, Andreas ; Weitzel, K.-M.:
Bombardment induced ion transport - Part III: Experimental potassium ion conductivities in poly(para-xylylene).
In: Physical Chemistry Chemical Physics. Vol. 15 (2013) Issue 5 . - pp. 1481-1487.
ISSN 1463-9084
DOI: https://doi.org/10.1039/c2cp43144k

Official URL: Volltext

Abstract in another language

The bombardment induced ion transport (BIIT) technique has been employed for studying the ionic conductivity of thin poly(p-xylylene) (PPX) films. The experiment is based on bombarding a PPX film with a c.w. potassium ion beam. The transport of ions through the film - which follows the laws of electrodiffusion - is detected as a neutralization current on the backside electrode on which the film has been deposited. This backside current scales quadratically with the acceleration potential of the ion beam and inversely cubically with the thickness of the film. This confirms theoretical predictions made in part I of this mini-series (Phys. Chem. Chem. Phys., 2011, 13, 20112-20122). This characteristic is markedly different from the Ohm-like current-voltage properties of a solid electrolyte, e. g. an ion conducting glass. The diffusion coefficient for K+ in PPX is determined to be 8.528 x 10(-16) cm(2) s(-1) at 333 K. From the temperature dependence of the diffusion coefficient we conclude that a hopping mechanism with an activation energy of 2.74 eV +/- 0.18 eV is operative.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: POISSON EQUATIONS; NERNST-PLANCK; FUEL-CELLS; FILMS; MEMBRANES
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 31 Mar 2015 08:56
Last Modified: 31 Mar 2015 08:56
URI: https://eref.uni-bayreuth.de/id/eprint/9491