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Effect of Environmental Humidity on the Ionic Transport of Poly(ethylene Oxide) Thin Films by Local Dielectric Spectroscopy

preprint
revised on 11.12.2019 and posted on 18.12.2019 by Paul Markus, Daniel E Martínez-Tong, Georg Papastavrou, Angel Alegria

The effect of humidity on the ionic transport in the amorphous phase of poly(ethylene oxide) thin films has been studied by via local dielectric spectroscopy. We explored a controlled humidity range between 15 %RH and 50 %RH. AFM-based local dielectric imaging allowed to obtain simultaneously the thin films topography and the corresponding dielectric contrast maps. No humidity effect on the film topography was observed whereas large variation of the dielectric signal could be detected. In addition, we observed a clear dielectric contrast in different locations on the thin film surface. At selected regions with high contrast in the dielectric maps, we performed nanoDielectric Spectroscopy (nDS) measurements covering the frequency range from 10 Hz to 100 kHz. By modeling these spectroscopy results, we quantified the conductivity of the amorphous phase of the semicrystalline poly(ethylene oxide) films. The crystalline fraction of the PEO thin films was extracted and found to be about 36%, independently of humidity. However, the average conductivity increased drastically from 2×10-10 to 5×10-9 S/cm, by changing environmental humidity in the explore %RH range.

Funding

EUSMI, H2020-INFRAIA-2016-1, PROJECT 731019

PGC2018-094548-B-I00

IT-1175-19

IJCI-2017-31600

History

Email Address of Submitting Author

danielenrique.martinezt@ehu.eus

Institution

University of the Basque Country

Country

Spain

ORCID For Submitting Author

0000-0002-3115-6222

Declaration of Conflict of Interest

Authors declare no conflict of interest

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