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Impedance Spectroscopy

Advanced Applications: Battery Research, Bioimpedance, System Design

Ed. by Kanoun, Olfa

Open Access
eBook (PDF)
Publication Date:
December 2018
Copyright year:
2019
ISBN
978-3-11-055892-0
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Study of the humidity effect on the electrical impedance of MWCNT epoxy nanocomposites

Sanli, Abdulkadir / Benchirouf, Abderrahmane / Müller, Christian / Kanoun, Olfa

Abstract

Owing to the excellent physical properties of carbon nanotubes (CNTs), incorporation of CNTs into polymer matrices would make the nanocomposites a potential candidate for smart sensing applications. However, environmental factors such as humidity might influence the nanocomposite properties and performance. In this work, the effect of humidity on the electrical properties of multiwalled CNT (MWCNT) epoxy nanocomposites is investigated by electrochemical impedance spectroscopy in the frequency range from 40 Hz to 110 MHz. The MWCNT epoxy nanocomposites with different MWCNT concentrations up to 1 % wt were fabricated by the direct mixing method and the composites were deposited on the glass epoxy substrate by the stencil printing technique. From the impedance results, it was observed that the overall impedance of the nanocomposites tends to increase with the increase of the humidity due to an increase in tunneling barriers induced by swelling of the polymer layer between the CNT junctions within the nanocomposite matrix. The humidity effect tends to decrease with the increase of MWCNT concentration due to a decrease of the tunneling effect at high MWCNT concentrations. Furthermore, the proposed nanocomposites at a 0.5 % wt concentration show a humidity sensitivity of about 0.006 % relative humidity (RH) and 0.004 % RH and linear responses with linear correlations (R2) of 0.98 and 0.93 for 100 Hz and 1 kHz, respectively. Moreover, the sensors were covered with latex polymer to minimize the humidity effects. It was found that with encapsulation of the nanocomposites, the relative impedance change of the nanocomposite is decreased from 3.76 % to 1.15 % at a 0.5 % wt MWCNT concentration.

Citation Information

Abdulkadir Sanli, Abderrahmane Benchirouf, Christian Müller, Olfa Kanoun (2018). Study of the humidity effect on the electrical impedance of MWCNT epoxy nanocomposites. In Olfa Kanoun (Editor), Impedance Spectroscopy: Advanced Applications: Battery Research, Bioimpedance, System Design (pp. 25–32). Berlin, Boston: De Gruyter. https://doi.org/10.1515/9783110558920-002

Book DOI: https://doi.org/10.1515/9783110558920

Online ISBN: 9783110558920

© 2018 Walter de Gruyter GmbH, Berlin/Munich/BostonGet Permission

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