Core–shell structured Ag@C nanocables for flexible ferroelectric polymer nanodielectric materials with low percolation threshold and excellent dielectric properties

Chen, Zhihui; Li, Hengfeng; Xie, Guiyuan; Yang, Ke

doi:10.1039/c7ra12686g

Cited by 36 publications

(24 citation statements)

References 43 publications

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“…This enhancement of dielectric constant near the percolation threshold can be explained by the formation of micro‐capacitor network in the polymer matrix, because nearer the percolation threshold, a large number of conducting CQD networks are separated by thin dielectric insulating layer of GO and polymers, which results in the formation of plenty of small capacitors throughout the CQD@GO‐P(VDF‐HFP) nanocomposite systems. Furthermore, in comparison with theoretical values, the experimental results are in good agreement with the percolation threshold, which is given by the power law:

ε_{r} \propto ε_{m} {({normalf}_{c} ‐ {normalf}_{CQD @ GO})}^{‐ normals} for f_{CQD @ GO} < f_{c}

where ε r and ε m are the dielectric constants of the nanocomposite and the P(VDF‐HFP) matrix, respectively. f CQD@GO is the weight percentage conducting phase, f c is the percolation threshold, and s is the critical exponent in the insulating polymer region.…”

Section: Resultsmentioning

confidence: 99%

Green synthetic route of carbon quantum dot‐reinforced graphene oxide‐poly(vinylidene fluoride‐co‐hexa fluoropropylene) nanocomposites: Toward high dielectric constant and suppressed loss

Mahaling

2019

J of Applied Polymer Sci

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A simple and green method was developed to fabricate carbon quantum dot@ graphene oxide filled poly (vinylidene fluoride‐co‐hexa‐fluoropropylene) [CQD@GO‐P(VDF‐HFP)] nanocomposite films via solution casting technique. The synthetic approach was to bring CQD from bilva leafs, a renewable and sustainable resource. The effect of CQD on dielectric properties, dielectric constant, and dielectric loss in the presence of GO along with P (VDF‐HFP) matrix were investigated. The result showed that the nanocomposites having 1.5 wt % of CQD@GO‐P(VDF‐HFP) with higher dielectric constant (≈144) at 100 Hz and suppressed loss (<1) at 1000 Hz, which is well supported by field emission scanning electron microscopy (FESEM) study. The FESEM study shows a river iceland morphology with a channel‐like structure along with voids and pores that may provide a conducting network, which tends to have Maxwell Wagner‐Sillars or interfacial polarization results in a high‐end properties outcome. Furthermore, the suppressed loss enhanced the possibility of end use performance of CQD@GO‐P(VDF‐HFP) matrix with a referral memorandum of percolation theory. Thus, the present work demonstrated a new approach to develop high dielectric constant and negligible loss materials in the field of embedded devices for electronic industries through green synthetic approach. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47850.

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ε_{r} \propto ε_{m} {({normalf}_{c} ‐ {normalf}_{CQD @ GO})}^{‐ normals} for f_{CQD @ GO} < f_{c}

Section: Resultsmentioning

confidence: 99%

Green synthetic route of carbon quantum dot‐reinforced graphene oxide‐poly(vinylidene fluoride‐co‐hexa fluoropropylene) nanocomposites: Toward high dielectric constant and suppressed loss

Mahaling

2019

J of Applied Polymer Sci

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“…8B, while another surface plasmon resonance (transverse mode) located at around 518 nm is nearly kept the same position. That is, the carbonaceous sheath indeed affects the surface plasmon resonance of the Au@C nanocomposites [36].…”

Section: Optical Propertiesmentioning

confidence: 99%

“…Second, the glucose acted as a reducing agent to reduce free Ag + ions to Ag 0 atoms at a high temperature (> 140°C) [33], because of its rich −OH and aldehyde groups. Then, the newly formed Ag nuclei acted as a nucleation center for glucose molecules adsorption and subsequently polymerized as a carbonaceous sheath on the silver backbone [34][35][36][37].…”

Section: Microstructure Of Carbonaceous Ag@c Nanostructuresmentioning

confidence: 99%

Development of a General Fabrication Strategy for Carbonaceous Noble Metal Nanocomposites with Photothermal Property

Zhu

Jiang

2020

Nanoscale Res Lett

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This study demonstrates a simple hydrothermal method while can be generalized for controllable synthesis of noble metallic carbonaceous nanostructures (e.g., Au@C, Ag@C) under mild conditions (180-200°C), which also provides a unique approach for fabricating hollow carbonaceous structures by removal of cores (e.g., silver) via a redox etching process. The microstructure and composition of the as-achieved nanoparticles have been characterized using various microscopic and spectroscopic techniques. Cetyltrimethylammonium bromide (CTAB), serving as a surfactant in the reaction system, plays a key role in the formation of Ag@C, Au@C nanocables, and their corresponding hollow carbonaceous nanotubes in this work. The dynamic growth and formation mechanism of carbonaceous nanostructures was discussed in detail. And finally, laser-induced photothermal property of Au@C nanocomposites was examined. The results may be useful for designing and constructing carbonaceous metal(s) or metal oxide(s) nanostructures with potential applications in the areas of electrochemical catalysis, energy storage, adsorbents, and biomedicine.

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“…At a concentration very near but still below the percolation threshold, a dramatically increased dielectric constant can be achieved in such nanocomposites. Using this approach, various nano‐ or microsized conducting fillers, such as metal nanoparticles, carbon materials (graphene, carbon nanotubes, carbon black), and conductive polymers, have been employed to achieve a high dielectric constant in composite materials.…”

Section: High Energy Density Ceramics/polymer Nanocompositesmentioning

confidence: 99%

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Zhang

Dong

et al. 2018

Adv Materials Inter

192

112

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systems, they have numerous applications in various fields as pulsed power supply technology, [8,9] energy harvesting, [10][11][12] inverters, [13][14][15] and passive elements, [16][17][18] toward both defense and civil industries. Excellent energy storage capabilities of dielectric materials including high discharged energy density and high energy efficiency have long been eagerly pursued to meet the challenges and needs of the rapid development of modern industry, i.e., the low energy density of current dielectric materials results in overburdened capacitor volume and weight in electrical power systems. The energy storage performances of dielectric materials are usually multiply determined by three major electrical and dielectric parameters, which are categorized as:1) The breakdown strength E b ;2) The relative permittivity (also called dielectric constant) ε r or electric displacement D (the electric displacement is related to the polarization P by D = P + ε 0 E, here ε 0 = 8.85 × 10 −12 F m −1 is the vacuum permittivity); 3) The dielectric loss tanδ.In general, as illustrated in Figure 1, the discharged energy density of dielectric materials can be determined aswhere E is the applied electric field, and the energy efficiency is calculated by Dielectric polymer nanocomposites by integration of high-E b polymer matrix and high-D(ε r ) ceramic fillers have shown great potential for dielectric and energy storage applications in modern electronic and electrical systems. Interface between ceramic fillers and polymer matrix is considered as a predominant factor to determine the dielectric performances of the nanocomposites. This review analyzes the influence of the interface on dielectric responses and breakdown strength in the nanocomposites, and discusses the viability of current interface engineering strategies in improving their energy storage capabilities. Two scopes of current interface modification approaches are focused from both structural and functional considerations in the dielectric ceramics/polymer nanocomposites: first, the organic/inorganic interface compatibility can be modified to generate homogeneous dispersion of ceramic nanoparticles in polymer matrix, which is the premise of fully realizing the synergistic combination of advantages of polymer and ceramic fillers; second, regulated local electrical and dielectric behaviors in interface region enable the enhancement of dielectric properties (both high dielectric constant and high breakdown strength) in resultant nanocomposites. In the last part, some present challenges and future perspectives are proposed to utilize the interface strategy for developing high energy density ceramics/ polymer nanocomposites for dielectric and energy storage applications.

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Core–shell structured Ag@C nanocables for flexible ferroelectric polymer nanodielectric materials with low percolation threshold and excellent dielectric properties

Abstract: Flexible Ag@C-NC/PVDF nanocomposite materials with low percolation threshold and dielectric constant of 295 at 1 kHz.

Cited by 36 publications

References 43 publications

Green synthetic route of carbon quantum dot‐reinforced graphene oxide‐poly(vinylidene fluoride‐co‐hexa fluoropropylene) nanocomposites: Toward high dielectric constant and suppressed loss

Green synthetic route of carbon quantum dot‐reinforced graphene oxide‐poly(vinylidene fluoride‐co‐hexa fluoropropylene) nanocomposites: Toward high dielectric constant and suppressed loss

Development of a General Fabrication Strategy for Carbonaceous Noble Metal Nanocomposites with Photothermal Property

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

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