公开(公告)号：US09865380B2

公开(公告)日：2018-01-09

申请号：US14890391

申请日：2013-06-24

Applicant: ABB TECHNOLOGY LTD

Inventor： Emmanuel Logakis ,  Alex Skordos ,  Panagiota Chatzi

IPC: B32B9/00 ,  H01B17/58 ,  H01B1/04 ,  H01B3/18 ,  C01B32/23

CPC classification number: H01B17/583 ,  B32B9/007 ,  B32B2250/40 ,  B32B2307/202 ,  C01B32/23 ,  H01B1/04 ,  H01B3/18 ,  Y10T428/30

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.