The deformation behavior of conductivity in composites where charge carrier transport is by tunneling: theoretical modeling and experimental results

Ryvkina, N. G.; Tchmutin, I. A.; Vilčáková, Jarmila; Pelíšková, Michaela; Sáha, Petr

doi:10.1016/j.synthmet.2004.09.028

Cited by 111 publications

(61 citation statements)

References 10 publications

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“…Due to the inter-particle conduction mechanism, polymer nanocomposites are showing higher electrical conductivity than that of the insulating polymer matrix before formation of continuous interconnected network path of nanofillers in the nanocomposites. Ryvkina et al [20] expressed that electron tunneling mechanism dominated the conduction in the polymer/CB nanocomposites and explained it with the help of following theoretical model shown in Equation (9): (9) where A signifies the tunnel parameter and d stands for the tunnel distance, respectively. In recent times, tunneling conduction mechanism in the different nanocomposites systems has been well explained in the literature [21,22].…”

Section: Results and Discussion 41 Electrical Analysis 411 DC Comentioning

confidence: 99%

A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties

Maiti¹,

Shrivastava²,

Suin³

et al. 2013

Express Polym. Lett.

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Abstract. In this work, polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites were prepared by simple melt mixing at a temperature (~350°C) well above the processing temperature of PC, followed by compression molding, that exhibited percolation threshold as low as of 0.11 wt% and high electrical conductivity of 1.38!10 -3 S·cm -1 at only 0.5 wt% MWCNT loading. Due to the lower interfacial energy between MWCNT and PC, the carbon nanotubes are excellently dispersed and formed continuous conductive network structure throughout the host polymer. AC electrical conductivity and dielectric permittivity of PC/MWCNT nanocomposites were characterized in a broad frequency range, 10 1 -10 7 Hz. Low percolation threshold (p c ) of 0.11 wt% and the critical exponent (t) of ~3.38 was resulted from scaling law equation. The linear plot of log! DC vs. p -1/3 supported the presence of tunneling conduction among MWCNTs. The thermal property and storage modulus of PC were increased with the incorporation of little amount of MWCNTs. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) confirmed the homogeneous dispersion and distribution of MWCNTs throughout the matrix phase.

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Section: Results and Discussion 41 Electrical Analysis 411 DC Comentioning

confidence: 99%

A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties

Maiti¹,

Shrivastava²,

Suin³

et al. 2013

Express Polym. Lett.

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“…As recently shown, tunnel conduction is a better match for experiments with wide range of filler concentrations before the formation of a continuous conductive particle network in carbon-reinforced nanocomposites, as direct contact between conductive particles would lead to much higher final electrical conductivities [20,30,31]. If tunnel conduction is considered, the dc electrical conductivity can be described by , where A is the so-called tunnel parameter and d is the tunnel distance [32]. This tunnel distance (d) is directly proportional to !…”

Section: Electrical Conductivitymentioning

confidence: 99%

Graphene nanoplatelets-reinforced polyetherimide foams prepared by water vapor-induced phase separation

Abbasi¹,

Antunes²,

Velasco³

2015

Express Polym. Lett.

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Abstract. The present work considers the preparation of medium-density polyetherimide foams reinforced with variable amounts of graphene nanoplatelets (1-10 wt%) by means of water vapor-induced phase separation (WVIPS) and their characterization . A homogeneous closed-cell structure with cell sizes around 10 µm was obtained, with foams exhibiting zero crystallinity according to X-ray diffraction (XRD). Thermogravimetric analysis under nitrogen showed a two-step thermal decomposition behaviour for both unfilled and graphene-reinforced foams, with foams containing graphene presenting thermal stability improvements, related to a physical barrier effect promoted by the nanoplatelets. Thermo-mechanical analysis indicated that the specific storage modulus of the nanocomposite foams significantly increased owing to the high stiffness of graphene and finer cellular morphology of the foams. Although foamed nanocomposites displayed no further sign of graphene nanoplatelets exfoliation, the electrical conductivity of these foams was significant even for low graphene contents, with a tunnel-like model fitting well to the evolution of the electrical conductivity with the amount of graphene.

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“…7 Exceptionally a decrease in conductivity is seen for a carbon black-silicone composite loaded above the percolation regime. 8 In extension the decreases in conductivity are in the range 10-10 4 times. An irreversible increase has been observed in composites deformed beyond their elastic limit.…”

mentioning

confidence: 99%

“…As reported previously the resistance of a 1 ϫ 20ϫ 20 mm sheet, measured in the direction of elongation, fell from ϳ10 12 to 20 ⍀ at 36% elongation. 12 Ryvkina et al 8 note that in a heavily loaded, uniaxially compressed composite the random network of percolation paths will contain more lateral contacts than axial contacts between filler particles. Lateral expansion accompanying compression accounts for the small, unexpected decrease in conductivity they observed.…”

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confidence: 99%

Metal–polymer composite with nanostructured filler particles and amplified physical properties

Bloor

Graham

Williams

et al. 2006

Applied Physics Letters

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The deformation behavior of conductivity in composites where charge carrier transport is by tunneling: theoretical modeling and experimental results

Cited by 111 publications

References 10 publications

A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties

A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties

Graphene nanoplatelets-reinforced polyetherimide foams prepared by water vapor-induced phase separation

Metal–polymer composite with nanostructured filler particles and amplified physical properties

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