Low percolation threshold of graphene/polymer composites prepared by solvothermal reduction of graphene oxide in the polymer solution

He, Linxiang; Tjong, S.C.

doi:10.1186/1556-276x-8-132

Cited by 128 publications

(98 citation statements)

References 49 publications

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“…[ 33 ] However, as a fi rst-order approximation, it is still being used in the literature. [34][35][36] The critical exponent can have higher values due to different phenomena happening at the micro-/nanoscale such as a high number of tunneling events, contact resistance, and the presence of structural imperfections in between the conductive media (Swiss cheese model). [ 32,37 ] In order to extract the τ values from the measurements, logσ Interestingly, for both DGnPs and SGnPs, τ was calculated to be close to 2 indicating a 3D percolation mechanism in the form of direct continuum contact even though the GnPs are 2D fi llers.…”

Section: Resultsmentioning

confidence: 99%

Foldable Conductive Cellulose Fiber Networks Modified by Graphene Nanoplatelet‐Bio‐Based Composites

Cataldi

Bayer

Bonaccorso

et al. 2015

Adv Elect Materials

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Truly foldable flexible electronic components require a foldable substrate modified with a conducting material that can retain its electrical conductivity and mechanical integrity even after hard mechanical manipulations and multiple folding events. Here, such a material exploiting the combination of all‐biodegradable components (substrate and the polymer matrix) and graphene nanoplatelets is designed and fabricated. A commercially available thermoplastic starch‐based polymer (Mater‐Bi) and graphene nanoplatelets are simultaneously dispersed in an organic solvent to formulate conductive inks. The inks are spray painted on pure cellulose sheets and hot‐pressed into their fiber network after drying. The resultant nanostructured flexible composites display excellent isotropic electrical conductivity, reaching very low sheet resistance value ≈10 Ω sq−1, depending on the relative concentration between the biopolymer and the graphene nanoplatelets. Transmission electron microscopy results indicated that during hot‐pressing, graphene nanoplatelets are physically embedded into the cellulose fibers, resulting in high electrical conductivity of the flexible composite. The paper‐like flexible conductors can withstand many severe folding events, maintaining their mechanical and electrical properties and showing only a slight decrease of their electrical conductivity with respect to the unfolded counterparts. Unlike conductive paper technologies, the proposed paper‐like flexible conductors demonstrate both sides isotropic conductivity due to pressure‐induced impregnation.

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Section: Resultsmentioning

confidence: 99%

Foldable Conductive Cellulose Fiber Networks Modified by Graphene Nanoplatelet‐Bio‐Based Composites

Cataldi

Bayer

Bonaccorso

et al. 2015

Adv Elect Materials

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show abstract

“…The static and electrical conductivity of the polyvinylidene difluoride (PVDF) composites containing two different fillers, solvothermally reduced graphene (SRG) and RGO were checked and a lower percolation threshold was observed for the SRG/PVDF composites [57,58] compared to the graphene/PVDF composite prepared by direct blending of chemically/thermally reduced GO sheets with polymers [59]. In the composite [57] the SRG sheets were homogeneously dispersed, which is attributed to the low p c value.…”

Section: Effect Of Fabrication Processmentioning

confidence: 99%

Electrical Properties of Graphene Polymer Nanocomposites

Khanam

Ponnamma

AL-Madeed

2015

Graphene-Based Polymer Nanocomposites in Electronics

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Graphene, a monolayer of sp 2 hybridized carbon atoms arranged in a two dimensional lattice has attracted electronic industrial interest due to its exceptional electrical properties. One of the most promising applications of this material is in polymer nanocomposites in which the interface of graphene based materials and polymer chains merge to develop the most technologically promising devices. This chapter presents the electrical properties of such graphene based polymer nanocomposites and also discusses the effect of various factors on their electrical conductivity. Graphene enables the insulator to conductor transition at significantly lower loading by providing percolated pathways for electron transfer and making the polymers composite electrically conductive. The effect of processing conditions, dispersion, aggregation, modification and aspect ratio of graphene on the electrical conductivity of the graphene/polymer nanocomposites is conferred.

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“…The small carbon black particles readily disperse and form conducting bridges between the graphite rich areas of the composite matrix [9]. Carbon nanotubes have been studied extensively of late as alternative filler materials [10], but they are limited by their very high cost and tendency to agglomerate, making them difficult to process for volume applications [11].…”

Section: Introductionmentioning

confidence: 99%

The effect of graphite and carbon black ratios on conductive ink performance

et al. 2017

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Conductive inks based on graphite and carbon black are used in a host of applications including energy storage, energy harvesting, electrochemical sensors and printed heaters. This requires accurate control of electrical properties tailored to the application; ink formulation is a fundamental element of this. Data on how formulation relates to properties have tended to apply to only single types of conductor at any time, with data on mixed types of carbon only empirical thus far. Therefore, screen printable carbon inks with differing graphite, carbon black and vinyl polymer content were formulated and printed to establish the effect on rheology, deposition and conductivity. The study found that at a higher total carbon loading ink of 29.4% by mass, optimal conductivity (0.029 X cm) was achieved at a graphite to carbon black ratio of 2.6 to 1. For a lower total carbon loading (21.7 mass %), this ratio was reduced to 1.8 to 1. Formulation affected viscosity and hence ink transfer and also surface roughness due to retention of features from the screen printing mesh and the inherent roughness of the carbon components, as well as the ability of features to be reproduced consistently.

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Low percolation threshold of graphene/polymer composites prepared by solvothermal reduction of graphene oxide in the polymer solution

Cited by 128 publications

References 49 publications

Foldable Conductive Cellulose Fiber Networks Modified by Graphene Nanoplatelet‐Bio‐Based Composites

Foldable Conductive Cellulose Fiber Networks Modified by Graphene Nanoplatelet‐Bio‐Based Composites

Electrical Properties of Graphene Polymer Nanocomposites

The effect of graphite and carbon black ratios on conductive ink performance

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