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A material comprising reduced graphene oxide, a device comprising the material and a method of producing the material

A graphene and fossil technology, applied in the field of graphene oxide-based materials, can solve problems such as increased electrical breakdown and insulation performance damage, and achieve the effect of reducing risks

Active Publication Date: 2016-02-03
HITACHI ENERGY SWITZERLAND AG
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  • Abstract
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  • Application Information

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Problems solved by technology

This concentration of the electric field increases the risk of electrical breakdown and the insulating properties of the material are consequently compromised

Method used

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  • A material comprising reduced graphene oxide, a device comprising the material and a method of producing the material
  • A material comprising reduced graphene oxide, a device comprising the material and a method of producing the material
  • A material comprising reduced graphene oxide, a device comprising the material and a method of producing the material

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Embodiment Construction

[0035] Graphene oxide (GO) is a layered carbon graphite with single or few layers, which has sufficient functional groups such as epoxy, hydroxyl and carboxyl functional groups. The ideal chemical structure of GO is shown in figure 1 middle.

[0036] Graphene oxide has attracted greater interest in recent years because the material is an intermediate product when making graphene from graphite. In ideal graphene, the one-atom-thick planar variant of carbon, sp 2 -Hybridized carbon atoms are arranged into a honeycomb lattice that exhibits high electrical conductivity. In contrast, the abundance of functional groups in GO partially disrupts the sp 2 -hybridization, GO partially includes sp of tetrahedral bonds 3 carbon atom. GO is therefore insulating, and as a synthetic GO film typically exhibits 10 12 Ω sq -1 or higher room temperature sheet resistance.

[0037] Various methods exist for reducing GO to strengthen its chemical affinity with graphene. A review of differe...

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Abstract

The present invention relates to a material comprising reduced graphene oxide, wherein the degree of reduction of the graphene oxide exhibits a spatial variation so that the material exhibits a gradient in the electric conductivity and / or permittivity. The material can for example be used in an electric device for purposes of field grading and / or dissipation of charges. Examples of electric devices wherein the material is beneficial includes cable accessories, bushings, power cables, microelectronics, switchgear, etc. The invention further relates to a method of producing a material for electrical applications. The method comprises treating different parts of a graphene oxide element differently, so as to achieve a different degree of reduction of the graphene oxide within the element, resulting in a sample having a gradient in the electrical conductivity and / or permittivity. The material could for example be obtained by means of applying a thermal gradient to a graphene oxide element, or by irradiation of a graphene oxide element.

Description

technical field [0001] The present invention relates to the field of graphene oxide-based materials and electrical devices using graphene oxide-based materials. Background technique [0002] In many applications of electrotechnology, materials with different electrical properties are combined. The electric field distribution in and around an electrical device depends on the electrical properties of the materials used in the device, as well as the geometry of the device. In AC applications, the field distribution depends largely on the dielectric constant of the material of the device, while in DC applications the field distribution depends largely on the conductivity of the device material. [0003] In many devices, different materials exhibiting very different electrical / dielectric properties are in contact. In such devices, the equipotential lines of the electric field tend to concentrate towards the interface of the low permittivity or low conductivity region. The grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/04C01B31/04
CPCH01B1/04C01B32/23H01B17/28Y10T428/30H01B3/18B32B9/007B32B2250/40B32B2307/202H01B17/583
Inventor E·洛加基斯A·斯科多斯P·查兹
Owner HITACHI ENERGY SWITZERLAND AG
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