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Published November 2021 | Supplemental Material + Published
Journal Article Open

ZnO/PDMS nanocomposite generator: Interphase influence in the nanocomposite electro-mechanical properties and output voltage

Abstract

Nanocomposite generators convert mechanical energy into electrical energy and are attractive low-power solutions for self-powered sensors and wearables. Homogeneous dispersion, high concentration, and orientation of the embedded filler strategies have been assumed to maximize the voltage output in nanocomposite generators. This work contrast these assumptions by studying the dominance of the interphase in low filler concentrations (¡10%) and random dispersions in a ZnO/PDMS nanocomposite generator with high peak-to-peak voltage generation capabilities (≈150 V). The interphase in the nanocomposite was studied by the analysis of the random dispersion of the nanocomposite through the estimation of the effective volume fraction (ϕ_(agg)) which allowed us to identify three levels of interaction: individual interphases, interacting interphases, and overlapping between NPs and interphases. The interacting interphase is responsible here for the high generated voltage. In addition, the impact of the interphase was studied by applying lumped element (LE) and interphasial power-law (IPL) models that capture the measured voltages and the electromechanical film properties. The obtained results justify that engineering of interphases could be a design strategy for high voltage generation.

Additional Information

© 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/). Received 6 November 2020, Revised 22 January 2021, Accepted 25 January 2021, Available online 8 February 2021. J.A. Perez-Taborda and J.M. Marmolejo-Tejada acknowledge the financial support from Department of Science, Technology, and Innovation (Colciencias) fellowship for the grant agreement N°.808. The authors wish also to thank the researchers Dr. Elvis Lopez and Dr. A. Mello for XPS measurements at the Laboratory of Surface and Nanostructures, Brazilian Physical Research Center - RJ, Brazil. This work was supported by Minciencias (Colombia) under Grant 808-2018 and a Joint Research Grant Program (2018) "Convocatoria interinstitucional de investigación en Ingeniería" between the Pontificia Universidad Javeriana Cali and Universidad de los Andes. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Additional details

Created:
August 22, 2023
Modified:
October 23, 2023