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Open AccessArticle

Integration of Polypyrrole Electrode into Piezoelectric PVDF Energy Harvester with Improved Adhesion and Over-Oxidation Resistance

1
Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea
2
Department of Human Ecology, Korea National Open University, Seoul 03087, Korea
3
Department of Fashion Industry, Ewha Womans University, Seoul 03760, Korea
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(6), 1071; https://doi.org/10.3390/polym11061071
Received: 18 May 2019 / Revised: 15 June 2019 / Accepted: 17 June 2019 / Published: 21 June 2019
(This article belongs to the Special Issue Innovative Functional Textiles)
Smart textiles for wearable devices require flexibility and a lightweight, so in this study, a soft polypyrrole (PPy) electrode system was integrated into a piezoelectric polyvinylidenefluoride (PVDF) energy harvester. The PVDF energy harvester integrated with a PPy electrode had the piezoelectric output voltage of 4.24–4.56 V, while the PVDF energy harvester with an additional aluminum-foil electrode exhibited 2.57 V. Alkaline treatment and chemical vapor deposition with n-dodecyltrimethoxysilane (DTMS) were employed to improve the adhesion between the PVDF and PPy and the resistance to over-oxidation in aqueous solutions. The PVDF film modified by an alkaline treatment could have the improved adhesion via the introduction of polar functional groups to its surface, which was confirmed by the ultrasonication. The surface hydrophobicity of the PPy electrode was enhanced by the DTMS coating, resulting in the improvement of the resistance to over-oxidation with a water contact angle of 111°. Even with the hydrophobic coating, the electrodes remained electroconductive and continued to transfer an electric charge, maintaining the piezoelectricity of the PVDF film. The developed electrode-integrated energy harvester is expected to be applied to smart textiles because it offers the advantages of efficient piezoelectric generation, flexibility, and durability. View Full-Text
Keywords: piezoelectricity; electroconductivity; flexibility; durability; electrode; energy harvester; polypyrrole; poly(vinylidene fluoride) piezoelectricity; electroconductivity; flexibility; durability; electrode; energy harvester; polypyrrole; poly(vinylidene fluoride)
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MDPI and ACS Style

Baik, K.; Park, S.; Yun, C.; Park, C.H. Integration of Polypyrrole Electrode into Piezoelectric PVDF Energy Harvester with Improved Adhesion and Over-Oxidation Resistance. Polymers 2019, 11, 1071.

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