Percolation Transition Under Thermal Reduction of Graphene Oxide

Бочаров, Г. С.; Елецкий, А. В.

doi:10.1134/s0022476618040091

Cited by 9 publications

(26 citation statements)

References 8 publications

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“…Analysis performed in Refs. [ 19 , 20 , 21 ] has shown that such a disagreement is caused by the existence of non-ideal contacts between the nanotubes forming the percolation chain. The contact resistance usually exceeds the typical resistance of nanotubes by several orders of magnitude.…”

Section: Percolation Behavior Of Polymer-based Composites Doped Wimentioning

confidence: 99%

“…The uncertainty of those factors hinders and practically excludes comprehensive quantitative determination of the dependence of the contact resistance on the applied voltage. The usage of a simple model approach, in which validity can be estimated on the basis of comparison with experiment, seems to be natural in such a situation [ 19 , 21 ]. In accordance with this approach [ 19 , 21 ], the conduction electrons are found in a rectangular potential well in which the depth is determined by the work function φ e .…”

Section: Percolation Behavior Of Polymer-based Composites Doped Wimentioning

confidence: 99%

“…The usage of a simple model approach, in which validity can be estimated on the basis of comparison with experiment, seems to be natural in such a situation [ 19 , 21 ]. In accordance with this approach [ 19 , 21 ], the conduction electrons are found in a rectangular potential well in which the depth is determined by the work function φ e . The value of this parameter is close to 5 eV [ 22 ], which exceeds the characteristic value of the kinetic energy of conduction electrons ( E e ~300 K).…”

Section: Percolation Behavior Of Polymer-based Composites Doped Wimentioning

confidence: 99%

“…One more example of carbon-based nanocomposite is presented by reduced graphene oxide (rGO) (see [ 5 , 6 , 19 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ] and works cited there). This material consisted of flakes of partially reduced graphene oxide.…”

Section: Percolation Behavior Of Reduce Graphene Oxidementioning

confidence: 99%

“…Such a behavior can be considered as a new type of percolation transition. The distinctive peculiarity of both types of nanocomposites is in the dependence of the conductivity of the material on the applied voltage [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Such a behavior is caused by a non-ideal character of the contact between the neighboring carbon nanoparticles involved in the composite.…”

Section: Introductionmentioning

confidence: 99%

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Percolation Conduction of Carbon Nanocomposites

Бочаров

Елецкий

2020

IJMS

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Carbon nanocomposites present a new class of nanomaterials in which conducting carbon nanoparticles are a small additive to a non-conducting matrix. A typical example of such composites is a polymer matrix doped with carbon nanotubes (CNT). Due to a high aspect ratio of CNTs, inserting rather low quantity of nanotubes (on the level of 0.01%) results in the percolation transition, which causes the enhancement in the conductivity of the material by 10–12 orders of magnitude. Another type of nanocarbon composite is a film produced as a result of reduction of graphene oxide (GO). Such a film is consisted of GO fragments whose conductivity is determined by the degree of reduction. A distinctive peculiarity of both types of nanocomposites relates to the dependence of the conductivity of those materials on the applied voltage. Such a behavior is caused by a non-ideal contact between neighboring carbon nanoparticles incorporated into the composite. The resistance of such a contact depends sharply on the electrical field strength and therefore on the distance between neighboring nanoparticles. Experiments demonstrating non-linear, non-Ohmic behavior of both above-mentioned types of carbon nanocomposites are considered in the present article. There has been a model description presented of such a behavior based on the quasi-classical approach to the problem of electron tunneling through the barrier formed by the electric field. The calculation results correspond qualitatively to the available experimental data.

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Section: Percolation Behavior Of Polymer-based Composites Doped Wimentioning

confidence: 99%