Percolation Conduction of Carbon Nanocomposites

Abstract

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.

Molecular dynamics simulations of hyperbranched poly(ethylene imine)–graphene oxide nanocomposites as dye adsorbents for water purification

“…through the application of an electric field 83,84 . The probability of finding a dye molecule in proximity to a GO flake was found to increase in the presence of the polymeric component, and to be higher in the GOFMB model.…”

Phase Change Materials with Enhanced Thermal Conductivity and Heat Propagation in Them

“…This permits the conclusion of high sensitivity of the transport coefficients of graphene samples to both the method used for their production and synthesis conditions. Recent experiments (see, for example, [62][63][64]) indicate that thermally reduced graphene oxide can possess much higher transport characteristics than those shown in Table 4. Therewith the experiments performed show that reliable, well-reproducible results can be obtained only at a rather low rate of heating.…”

“…Recent experiments (see, for example, [62][63][64]) indicate that thermally reduced graphene oxide can possess much higher transport characteristics than those shown in Table 4. Therewith the experiments performed show that reliable, well-reproducible results can be obtained only at a rather low rate of heating.…”

The Physical Chemistry and Chemical Physics (PCCP) Section of the International Journal of Molecular Sciences in Its Publications: The First 300 Thematic Articles in the First 3 Years

“…In this Thematic Area, 56 articles have been published [ 48 , 64 , 104 , 108 , 110 , 124 , 195 , 252 , 253 , 254 , 255 , 256 , 257 , 258 , 259 , 260 , 261 , 262 , 263 , 264 , 265 , 266 , 267 , 268 , 269 , 270 , 271 , 272 , 273 , 274 , 275 , 276 , 277 , 278 , 279 , 280 , 281 , 282 , 283 , 284 , 285 , 286 , 287 , 288 , 289 , 290 , 291 , 292 , 293 , 294 , 295 , 296 , 297 , 298 , 299 , 300 ], an...…”

“…The processes in inorganic nanomaterials were considered in one way or another, in articles [ 104 , 108 , 110 , 252 , 253 , 264 , 265 , 267 , 268 , 269 , 270 , 275 , 276 , 279 , 281 , 285 , 286 , 287 , 297 ]. Additionally, here, the materials in which these processes are implemented are very diverse.…”