Robust nanogenerators based on graft copolymers via control of dielectrics for remarkable output power enhancement

Jae Won Lee, Hye Jin Cho, Jinsung Chun, Kyeong Nam Kim, Seongsu Kim, Chang Won Ahn, Ill Won Kim, Ju Young Kim, Sang Woo Kim, Changduk Yang, Jeong Min Baik

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Arobust nanogenerator based on poly(tert-butyl acrylate) (PtBA)-grafted polyvinylidene difluoride (PVDF) copolymers via dielectric constant control through an atom-transfer radical polymerization technique, which can markedly increase the output power, is demonstrated. The copolymer is mainly composed of a phases with enhanced dipole moments due to the p-bonding and polar characteristics of the ester functional groups in the PtBA, resulting in the increase of dielectric constant values by approximately twice, supported by Kelvin probe force microscopy measurements. This increase in the dielectric constant significantly increased the density of the charges that can be accumulated on the copolymer during physical contact. The nanogenerator generates output signals of 105 V and 25 μA/cm2, a 20-fold enhancement in output power, compared to pristine PVDF-based nanogenerator after tuning the surface potential using a poling method. The markedly enhanced output performance is quite stable and reliable in harsh mechanical environments due to the high flexibility of the films. On the basis of these results, a much faster charging characteristic is demonstrated in this study.

Original languageEnglish
Article numbere1602902
JournalScience Advances
Issue number5
Publication statusPublished - 2017 May

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© 2017 The Authors, some rights reserved.

All Science Journal Classification (ASJC) codes

  • General


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