Highways for ions in polymers : 3D–imaging of electrochemical interphase formation

Titelangaben

Wesp, Veronika ; Zakel, Julia ; Schäfer, Martin ; Paulus, Ilka E. ; Greiner, Andreas ; Weitzel, Karl-Michael:
Highways for ions in polymers : 3D–imaging of electrochemical interphase formation.
In: Electrochimica Acta. Bd. 170 (2015) . - S. 122-130.
ISSN 0013-4686
DOI: https://doi.org/10.1016/j.electacta.2015.04.117

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Abstract

The formation of a cesium interphase in-between a polymer film and a platinum electrode has been initiated by low energy bombardment induced ion transport. To this end two different samples of a poly(p-xylylene)(PPX) film, deposited on a platinum electrode have been bombarded by a low energy cesium ion beam. Ions are transported through the film according to the laws of electro-diffusion. They are neutralized at the interface between the PPX film and the metal electrode. Consequently, a cesium interphase is formed. 3D imaging of the interphase by means of time-of-flight secondary ion mass spectrometry (ToF-SIMS) reveals a correlation between structural characteristics of the interphase and conduction properties of the PPX film. The bombardment of PPX films consisting of a homogenous network leads to the formation of a uniform interphase. The bombardment of PPX films with non-intermittent pathways (NIPs) for the transport of ions leads to the formation of cesium islands which ultimately spread out laterally leading to a non-uniform interphase behind the PPX film. This picture is supported by measurements of the ionic conductivity which differs characteristically for the two kinds of PPX films.