Fabricate Graphene Composites Via Chemical Vapor Deposition And Their Applications

Graphene has many excellent properties,whereas atomic thin-layer graphene used alone will suffer from some limitations.Therefore,composing with other materials can effectively expand its applications.On the other hands,combining with the excellent properties of graphene,the novel properties and the improvement of composites could be occured.At present,many efforts are devoted to the research of composite materials,such as coating graphene on the surface of insulator to achieve conductivity through spin coating and growth methods.However,in actual applications,these surface graphene is vulnerable to be damaged,such as defects and abrasion caused via scratches,leading to decline the properties which is endowed by graphene.Other studies indicated that composited graphene sheets,that derived from chemical methods,with ceramics or polymers.The inevitable structural defects in graphene sheets introduced during exfoliation and reduction processes will generate greatly performance degradation.In order to construct high-quality graphene inside these traditional structural materials,we will have to be carefully designed at nanoscales.Chemical vapor deposition(CVD)method is considered as an efficient way to produce high-quality graphene.Via the direct growth,surface graphene can be pre-fabricated,thereby avoiding the limitations such as quality and distribution disadvantages originated from the mixing process,and greatly simplifying the preparation process of the composite material.Utilizing this superior method,we can coutrust high-quality graphene inside the insulating material.In this paper the following two aspects are studied:(1)Graphene composited with kaolin.Firstly,graphene could not be grown on the surface of kaolin.Therefore,in order to composite high-quality graphene with this kind of structural materials,we utilized the segregation properties of the metallic nickel particle in the growth process.After these processes,the composites possessed a high structural strength.Furthermore,a good Joule heating effect was exhibited in composites owing to the cross-linking graphene provided a continuous charge transfer path.In addition,the composite exhibited good hydrophobicity due to the construction of high-quality graphene.Thanks to these characteristics,the composite was applied as a deicing device,which exhibited a good deicing rate at low energy consumption and excellent high stability.(2)Graphene composited with aluminum oxide particles.Considering that the disadvantage originated from the growth of graphene on the insulating substrate,we utilized metal-assisted catalyzed growth of the adhered graphene layers on the surface of aluminum oxide particles.Using chemical vapor deposition methods,we achieved that the large area uniform and high-quality growth of graphene on the substrate.After the densification process,the graphene could be used as a stable dispersed phase to composite with the aluminum trioxide.Noting that,at this time,the graphene have been a stable and uniform dispersion phase to occupy the interface and surface of the composites.After compounding with graphene,the insulator aluminum trioxide had the enhanced mechanical property and excellent electrical conductivity.Owing to the interface graphene,the composites also had good damage-resistance and high temperature stability,which benefited from high quality and uniform dispersion of graphene.