Elastic interface in few‐layer graphene/poly(vinylidenefluoride‐trifluoroethylene‐chlorofluoroethylene) nanocomposite with improved polarization

Abstract

Polymer film capacitor exhibits extensive applications in advanced electronics because of its flexibility and huge power density. The current research interests of polymer capacitor are addressed on large energy density and high chargedischarge efficiency of composite film. Here we developed the compatible elastic interface composed of hyperbranched poly(methyl acrylate) copolymer in graphene/poly(vinylidenefluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) nanocomposite with high energy capability. This hyperbranched copolymer comprising polyethylene core that was grafted with poly(methyl acrylate) (PMA) segments and pyrene units was synthesized by atom transfer radical polymerization. The few-layer graphene was exfoliated with assistance of hyperbranched copolymer that was attached on surface of flakes via π-π noncovalent interactions between pyrene groups and delocalized π electrons of nanosheets. Graphene/P(VDF-TrFE-CFE) nanocomposite film was prepared by solution casting method. The compatibility between graphene and fluoropolymer is greatly improved due to the elastic interphase of PMA segments in hyperbranched copolymer, which enhances the interfacial polarization and decreases the accumulation of charge carriers under high electric field. The energy density of 7.0 J/cm 3 with charge-discharge efficiency of 60% at 300 MV/m is achieved for 0.1 wt% nanocomposite. This work reveals an effective architecture of polymer composite with elastic interface to increase the energy capability of polymer dielectric film.

Multifunctional and stretchable graphene/textile composite sensor for human motion monitoring

“…Various carbon materials, conductive polymers and metals have been used to coat fabrics to fabricate sensors 28–31 . Among various conductive materials, graphene has outstanding electrical, mechanical, and thermal properties, which exhibits great potential as a conductive substrate in textile strain sensors 32–35 . Many functional textile sensors can be developed through chemical vapor deposition (CVD), 36 producing graphene oxide‐based fabrics and reduced graphene oxide‐based textiles 37,38 .…”

“…[28][29][30][31] Among various conductive materials, graphene has outstanding electrical, mechanical, and thermal properties, which exhibits great potential as a conductive substrate in textile strain sensors. [32][33][34][35] Many functional textile sensors can be developed through chemical vapor deposition (CVD), 36 producing graphene oxide-based fabrics and reduced graphene oxide-based textiles. 37,38 However, graphene-based sensors fabricated by CVD are often expensive and difficult to control the size of generated graphene compounds.…”

High Energy Storage Density in Nanocomposites of P(VDF-TrFE-CFE) Terpolymer and BaZr0.2Ti0.8O3 Nanoparticles

“…In Table 1, the energy storage parameters of the composites under study are compared with the results for other composites, based on P(VDF-TrFE-CFE) terpolymers reported in the literature. Most of the research focuses on materials containing fillers in the form of nanofiber or nanosheets, as these composites are expected to have higher dielectric strength [26][27][28][29][30][31][32]. Nevertheless, one can see that, at moderate electric fields (100-150 kV/cm), the composites with nanoparticles outperform the composites with nanowires or nanosheets, demonstrating a superior energy storage capacity at a relatively low volume fraction.…”

“…Such composites combine the flexibility, light weight, and high dielectric strength of polymers with the large dielectric permittivity, and piezoelectric and pyroelectric coefficients of inorganic ferroelectrics. It is shown that the introduction of ferroelectric nanoparticles, such as BaTiO 3 , Pb(Zr,Ti)O 3 , or TGS, into polymers yields capacitors with significantly enhanced piezoelectric and pyroelectric coefficients, as well as stored energy density [20][21][22][23][24][25][26][27][28][29][30][31][32]. The morphology of the filler, its volume fraction, the surface properties of the filler, the properties of the polymer-filler interface, and the distribution of the filler in the polymer matrix play important roles in optimizing the energy storage properties.…”

A Brief Introduction and Current State of Polyvinylidene Fluoride as an Energy Harvester

“…Achieved Energy Storage Density 6-fold P&F PVDF films [126] 39.80 J/cm 2 at 880 kV/mm BaTiO 3 /PVDF layers [127] 20.70 J/cm 2 at 690 kV/mm BiFeO 3 TiO 2 -PVDF/PMMA [128] 19.30 J/cm 2 at 549 kV/mm BN/PVDF/BN [129] 19.26 J/cm 2 at 465 kV/mm Three-layer PVDF [130] 11.00 J/cm 2 at 440 kV/mm Pure PVDF [127] 9.30 J/cm 2 at 500 kV/mm 3 wt% BZT-BCT NFs/PVDF [131] 7.86 J/cm 2 at 310 kV/mm 0.1 wt% graphene/P(VDF-TrFE-CFE) [132] 7.00 J/cm 2 at 300 kV/mm BaTiO 3 -CoFe 2 O 4 /PVDF [133] 5.60 J/cm 2 at 263 kV/mm 1.25 wt% Ba(Zr,Ti)O 3 /P(VDF-TrFE-CFE) [134] 2.80 J/cm 2 at 75 kV/mm…”