Electrical properties of thermally reduced graphene oxide

Бочаров, Г. С.; Елецкий, А. В.; Mel’nikov, V. P.

doi:10.17586/2220-8054-2018-9-1-98-101

Cited by 12 publications

(21 citation statements)

References 8 publications

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“…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%

“…This material consisted of flakes of partially reduced graphene oxide. Electrical propertied of such a material are determined by the reduction degree [ 6 ].…”

Section: Percolation Behavior Of Reduce Graphene Oxidementioning

confidence: 99%

“…This drawback hinders a wide spread of the chemical reduction GO method and stimulates developing alternative approaches. The most natural approach to the reduction of GO avoiding the above-mentioned drawback is the thermal processing of a material resulting in splitting out radicals such as oxygen, СО, ОН etc., from GO fragments [ 5 , 6 , 7 , 19 , 45 , 46 , 47 , 48 , 49 , 50 ]. The binding energy of such radicals with graphene structure is several times lower than that required for destroying of such a structure therefore it is possible to find the conditions at which splitting out radicals is not accompanied by decomposition of graphene lattice.…”

Section: Percolation Behavior Of Reduce Graphene Oxidementioning

confidence: 99%

“…The electric conductivity is a very convenient indicator of the degree of GO reduction. This parameter was used in [ 6 , 19 ] as a major number determining the dynamics of transformation of GO to a state close to graphene. Graphene oxide produced by the Hummers method [ 44 ], with utilization of potassium nitrate, potassium permanganate, and concentrated sulfur acid, was used as an initial material.…”

Section: Percolation Behavior Of Reduce Graphene Oxidementioning

confidence: 99%

“…Another type of carbon nanocomposite is represented by a film consisted of fragments of partially reduced graphene oxide (GO). Such a film is formed particularly as a result of thermal reduction of GO [ 5 , 6 , 7 ]. In such composites, the percolation transition proceeds not as a result of the enhancement of the concentration of conducting nanoparticles, but due to the increase in conductivity of such particles as a result of the reduction process.…”

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 Reduce Graphene Oxidementioning

confidence: 99%

“…This material consisted of flakes of partially reduced graphene oxide. Electrical propertied of such a material are determined by the reduction degree [ 6 ].…”

Section: Percolation Behavior Of Reduce Graphene Oxidementioning

confidence: 99%

Section: Percolation Behavior Of Reduce Graphene Oxidementioning

confidence: 99%

Section: Percolation Behavior Of Reduce Graphene Oxidementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Percolation Conduction of Carbon Nanocomposites

Бочаров

Елецкий

2020

IJMS

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Measurements on Five Characterizing Properties of Graphene Oxide and Reduced Graphene Oxide Foils

Torrisi

Cutroneo

Torrisi

et al. 2022

Physica Status Solidi (a)

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Graphene (G) is a thin graphite sheet consisting of sp 2 carbon atoms disposed in a hexagonal structure. [1] Single or multiple graphene sheet can be obtained exfoliating graphite and generating graphene oxide (GO). [2] Lastly, this has interesting properties that are strongly influenced by the oxygen functional groups arranged on its surface and edges. GO contains functional oxygen groups such as hydroxyl and epoxy groups attached on the basal plane and carboxyl, carbonyl, and phenol groups at the edges. [3] GO has peculiar properties as mechanical flexibility, low solubility, high electrical resistivity, low optical absorbance in the near IR region, and high hydrophilic behavior, which permits good adherence to other materials and possibility to prepare complex composite structures. [1,4] Although mechanically less resistant than graphene, graphene oxide has advantages with respect to graphene, it is commercially cheap and available in large quantities, easier to exfoliate, and adapt to realize many types of composites especially coupled with different polymers. [4] The actual state of art concerning GO properties indicates that it can be modified drastically reducing the functional oxygen groups. Depending on the level of reduction, the resulting reduced graphene oxide (rGO) is electrically conductive, mechanically more resistant than GO, it has high absorbance in the near IR region, and higher density and hydrophobic properties. [5,6] The chemical and physical properties of GO and rGO depend on the amount of the functional groups bonded to the graphene platelets and of the coupled materials in the case of composite structures. [3] Such matter has found many applications in different fields, so as Biology and Medicine, microelectronics, environment, matter structure, engineering, nuclear Physics, Chemistry, and others.The low cytotoxicity of such materials, high biocompatibility, and hemocompatibility make them suitable for use as medical prosthesis, biocompatible nanoparticles, plan for cell cultures, and others. [7] The high-energy gap of GO and its controllable reduction in rGO and the high electrical conductivity of G permit to realize microelectronic devices such as field effect transistors (FET), light emitter diodes, radiation detectors, supercapacitors, and micrometric conductive tracks. [8,9] The use of G and GO as membranes permits to filter solution separating the solute from the solvent, producing desalination of sea water and eliminating pollutants from rivers and lakes. [10] The G, GO, and rGO nanoparticles inclusion in other materials determines physical and chemical modifications of the matrix, such as mechanical, optical, and electrical properties. [11] Transparent polymers become opaque also using less than the 0.1% concentration of graphene-based nanoparticles. Engineering is using graphene-based material to build light and resistant foils to be employed in aeronautical, naval, and automotive handling. [12] Nuclear Physicists are using these materials as ion strippers in accelerators, as sen...

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