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

被引:254
作者
Lee, Jae Won [1 ]
Cho, Hye Jin [2 ]
Chun, Jinsung [1 ]
Kim, Kyeong Nam [1 ]
Kim, Seongsu [3 ]
Ahn, Chang Won [4 ,5 ]
Kim, Ill Won [4 ,5 ]
Kim, Ju-Young [1 ]
Kim, Sang-Woo [3 ,6 ]
Yang, Changduk [2 ]
Baik, Jeong Min [1 ]
机构
[1] Ulsan Natl Inst Sci & Technol, KIST UNIST Ulsan Ctr Convergent Mat, Sch Mat Sci & Engn, Ulsan 44919, South Korea
[2] Ulsan Natl Inst Sci & Technol, Sch Energy & Chem Engn, Dept Energy Engn, Ulsan 44919, South Korea
[3] Sungkyunkwan Univ, SKKU Adv Inst Nanotechnol, Suwon 16419, South Korea
[4] Univ Ulsan, Dept Phys, Ulsan 44610, South Korea
[5] Univ Ulsan, Energy Harvest Storage Res Ctr, Ulsan 44610, South Korea
[6] Sungkyunkwan Univ, Sch Adv Mat Sci & Engn, Suwon 16419, South Korea
关键词
ELECTRIC ENERGY DENSITY; TRIBOELECTRIC NANOGENERATOR; POLY(VINYLIDENE FLUORIDE); FERROELECTRIC PROPERTIES; CONTACT ELECTRIFICATION; POLYMER; FILMS; PHASE; FIELD; ELECTRONICS;
D O I
10.1126/sciadv.1602902
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 mu A/cm(2), 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.
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页数:9
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