Nanocomposites of poly(vinylidene fluoride) - Controllable hydroxylated/carboxylated graphene with enhanced dielectric performance for large energy density capacitor

Yang, Cheng; Hao, Sijia; Dai, Shenglong; Zhang, Xiaoyan

doi:10.1016/j.carbon.2017.03.004

Cited by 95 publications

(55 citation statements)

References 45 publications

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“…To synthesize carboxylated graphene oxide, GO suspension solution (1 mg/mL) was sonicated for 30 min, and then, ClCH 2 COONa (1.2 g, 40 mL) was mixed with GO solution (1 mg/mL, 20 mL) under ultrasonication for 30 min. Finally, sodium hydroxide solution (10 mol/mL, 40 mL) was added to the mixture under magnetic stirring for 3 h. The mixture solution was neutralized by a HCl solution (1 M), and the precipitate was washed with distilled, deionized water and alcohol by centrifugation to remove the unreacted ClCH 2 COONa 20,21 .…”

Section: Synthesis Of Carboxylated Graphene Oxide (Go-cooh)mentioning

confidence: 99%

Triple-synergistic 2D material-based dual-delivery antibiotic platform

Han

et al. 2020

NPG Asia Mater

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Two-dimensional (2D) nanomaterials have raised significant interest in not only energy and environmental fields but also biomedical areas. Among these materials, one type that has many interesting properties and possesses numerous exciting applications is graphene oxide (GO)-based 2D materials. However, their poor stability in aqueous solutions and weak bioactivities limit their use in biomedical applications, especially antimicrobial fields. In this study, GO was functionalized with hydrophilic polymers and used as a vector for silver nanoparticles (Ag NPs) and sulfadiazine (SD). The stability of the material in aqueous solutions was greatly improved. The antibacterial activity of the novel hybrid antibacterial system (HAS) was enhanced by over 3 times compared to that of the system lacking SD. The antibacterial performance of the HAS was due to the triple synergy: bacterial capping, puncture, and inhibition. This study provides new insights into the design and fabrication of surface-modified GO and carbon materials and their 2D hybrid multifunctional materials for advanced applications including biomedical and especially antibacterial applications, broadening the design and application scope of carbon and 2D materials.

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Section: Synthesis Of Carboxylated Graphene Oxide (Go-cooh)mentioning

confidence: 99%

Triple-synergistic 2D material-based dual-delivery antibiotic platform

Han

et al. 2020

NPG Asia Mater

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“…Functional polymer-matrix nanocomposites with high dielectric constant (ε ) and low loss become promising candidates for various r 1,2 applications, such as organic field-effect transistors (OFETs), 3 4-7 electrical stress control applications, energy-storage devices, 8 9, 10 antennas, actuators etc., owing to their excellent dielectric and mechanical properties (e.g., high breakdown strength, low loss, flexibility, easy processability, etc.). Nonetheless, there are still challenges preventing dielectric polymers from being widely used, among which is the limited value of dielectric constant (i. e. mostly [11][12][13] ε < 10).…”

Section: Introductionmentioning

confidence: 99%

Enhancing Dielectric Performance of Poly(vinylidene fluoride) Nanocomposites via Controlled Distribution of Carbon Nanotubes and Barium Titanate Nanoparticles

Wang¹,

Shi²,

Wang³

et al. 2018

Eng. Sci.

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Polymer-based dielectric materials have attracted increasing attention owing to their huge potential applications in modern electronic devices. The dielectric behaviors of polymer composites are greatly determined by the distribution of fillers, thus the clarification of the relationship between the dielectric properties of the composites and the spatial distribution of fillers would be highly favorable for designing novel high-performance dielectrics. Herein, the dielectric performances of ternary composites consisting of barium titanate (BT), carbon nanotube (CNT) and poly(vinylidene fluoride) (PVDF) were investigated. For comparison, the dielectric properties of trilayer 3 composites were also studied. The ternary composites exhibited an ultra-high dielectric constant of 7×10 @10 kHz, but a high loss tangent of 25 @10 kHz. For the trilayer composites, the BT/PVDF outer layers could restrain the development of leakage current, leading to low loss tangent (0.03 @10 kHz) and high breakdown strength. Meanwhile, the trilayer composites also achieved a high dielectric constant of 95 @10 kHz owing to the considerably enhanced polarizations at the filler/matrix and layer/layer interfaces. This research provides important sights into the relationship between the dielectric properties of the composites and the spatial distributions of fillers, which will strongly boost the exploration of high-performance dielectrics.

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“…The loss curve shows two different variations: the loss value decreases slightly from 10 2 to 10 4 Hz, which is mainly induced by the conductive loss . As the frequency increases from 10 4 to 10 6 Hz, the dielectric loss gradually increases again, which is ascribed to the C–F dipole orientation polarization of the P(VDF‐CTFE) matrix . The dielectric loss of the nanocomposite retains low level at the initial testing stage due to the stretching treatment and improved compatibility between nanosheets and polymer host .…”

Section: Resultsmentioning

confidence: 99%

“…The improvement of polarization is attributed to the strong entanglement between P(VDF‐CTFE) macromolecular chains and the PTFEMA segments adsorbed on the graphene surface via CH—π interactions . The mobility of the P(VDF‐CTFE) macromolecular chain is limited, which decreases the possibility of charge carriers transferring through the loose P(VDF‐CTFE) regions . Further increasing the volume fraction of fillers results in the decline of polarization because of the inevitable defects in the nanocomposite, involving the voids at the interfaces and the porosity, which leads to the decrease of polarization under high loading.…”

Section: Resultsmentioning

confidence: 99%

High Energy Density in Poly(Vinylidene Fluoride‐Chlorotrifluoroethylene) Nanocomposite with Oriented Graphene Exfoliated with Assistance of Fluoro Hyperbranched Copolymer

Zhang

Zhu

et al. 2019

Energy Tech

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Although a polymer film capacitor releases a huge power density in pulse time, its electrical capability is limited by the low energy density for the embedded hybrid device. It is still a challenge to increase the energy density and retain high charge–discharge efficiency of the polymer film. High dielectric properties and high energy density are obtained in the uniaxial stretching poly(vinylidene fluoride‐chlorotrifluoroethylene) (P(VDF‐CTFE)) nanocomposite incorporated with few‐layer graphene, which is exfoliated with the assistance of a fluoro hyperbranched polyethylene‐graft‐poly(trifluoroethyl methacrylate) (HBPE‐g‐PTFEMA) copolymer via CH—π noncovalent interactions. The graphene/P(VDF‐CTFE) nanocomposite film is prepared via solution casting, and then, the in‐plane orientation of nanosheets is accomplished by uniaxial deformation. The relative content of the β phase reaches 96.0% in 0.8 vol% nanocomposite due to the combination of improved compatibility and the alignment of macromolecular chains. The energy density of a 0.1 vol% graphene/P(VDF‐CTFE) film achieves 9.5 J cm−3 as E = 400 MV m−1, which is attributed to the large‐content electroactive phase and interfacial polarization. The P(VDF‐CTFE) nanocomposite incorporated with aligned graphene exhibits a promising energy storage capability, which indicates that the orientation of nanosheets is an effective solution to enhance the energy density of the polymer film with large charge–discharge efficiency.

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Nanocomposites of poly(vinylidene fluoride) - Controllable hydroxylated/carboxylated graphene with enhanced dielectric performance for large energy density capacitor

Cited by 95 publications

References 45 publications

Triple-synergistic 2D material-based dual-delivery antibiotic platform

Triple-synergistic 2D material-based dual-delivery antibiotic platform

Enhancing Dielectric Performance of Poly(vinylidene fluoride) Nanocomposites via Controlled Distribution of Carbon Nanotubes and Barium Titanate Nanoparticles

High Energy Density in Poly(Vinylidene Fluoride‐Chlorotrifluoroethylene) Nanocomposite with Oriented Graphene Exfoliated with Assistance of Fluoro Hyperbranched Copolymer

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