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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Sci+Adv
2017 ; 3
(5
): e1602902
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Robust nanogenerators based on graft copolymers via control of dielectrics for
remarkable output power enhancement
#MMPMID28560339
Lee JW
; Cho HJ
; Chun J
; Kim KN
; Kim S
; Ahn CW
; Kim IW
; Kim JY
; Kim SW
; Yang C
; Baik JM
Sci Adv
2017[May]; 3
(5
): e1602902
PMID28560339
show ga
A robust 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 ?
phases with enhanced dipole moments due to the ?-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 ?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.