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Issue 23, 2020
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Contact electrification between identical polymers as the basis for triboelectric/flexoelectric materials

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Abstract

Polymer contact electrification offers the possibility to harvest mechanical energy using lightweight, flexible and low-cost materials, but the mechanism itself is still unresolved. Several recent studies confirm heterolytic covalent bond breaking as the mechanism for surface charge formation. Here it is shown that the reason for the formation of surface charge by contacting two identical polymers results from the fluctuation in the surface irregularities, and that contacted materials with a greater porosity or surface roughness differential result in a greater generation of surface charge. Porosity and surface roughness create uneven surface length percentage changes in the lateral direction during deformation, which changes the charge density across the surface during relaxation. Multilayered membranes exhibit flexoelectric properties upon pressing and releasing by generating charge without separating individual membrane layers. This new insight deepens the understanding of polymer contact electrification and highlights better ways to prepare triboelectric or flexoelectric nanogenerator devices.

Graphical abstract: Contact electrification between identical polymers as the basis for triboelectric/flexoelectric materials

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Supplementary files

Article information


Submitted
10 Apr 2020
Accepted
14 May 2020
First published
08 Jun 2020

Phys. Chem. Chem. Phys., 2020,22, 13299-13305
Article type
Paper

Contact electrification between identical polymers as the basis for triboelectric/flexoelectric materials

A. Šutka, K. Mālnieks, L. Lapčinskis, M. Timusk, K. Kalniņš, A. Kovaļovs, J. Bitenieks, M. Knite, D. Stevens and J. Grunlan, Phys. Chem. Chem. Phys., 2020, 22, 13299
DOI: 10.1039/D0CP01947J

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