Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 61: Interfaces and Thin Films I (joint session CPP/DY, organized by CPP)
CPP 61.2: Vortrag
Donnerstag, 10. März 2016, 16:45–17:00, H51
Highways for ions in polymers - 3D-imaging of electrochemical interphase formation — •Karl-Michael Weitzel1, Veronika Wesp1, Julia Zakel1, Martin Schäfer1, Ilka Paulus2, and Andreas Greiner2 — 1Fachbereich Chemie, Philipps-Universität Marburg — 2Makromolekulare Chemie II, Universität Bayreuth
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 [1]. 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 nonintermittent 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.
[1] Wesp et al., Electrochimica Acta, 170 (2015) 122-130