Thermally conductive and electrically insulating epoxy nanocomposites with silica-coated graphene

Graphene oxide was reduced and functionalized simultaneously by reacting with 3-aminopropyltriethoxysilane (APTES) without the use of conventional reducing agents. Silica was subsequently formed in situon APTES functionalized graphene (A-graphene) sheets by a sol-gel approach using tetraethyl orthos...

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Bibliographic Details
Published inRSC advances Vol. 4; no. 29; pp. 15297 - 15303
Main Authors Pu, Xue, Zhang, Hao-Bin, Li, Xiaofeng, Gui, Chenxi, Yu, Zhong-Zhen
Format Journal Article
LanguageEnglish
Published 01.01.2014
Subjects
Covalence
Graphene
Heat transfer
Nanocomposites
Nanoparticles
Oxides
Silicon dioxide
Thermal conductivity
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Summary:Graphene oxide was reduced and functionalized simultaneously by reacting with 3-aminopropyltriethoxysilane (APTES) without the use of conventional reducing agents. Silica was subsequently formed in situon APTES functionalized graphene (A-graphene) sheets by a sol-gel approach using tetraethyl orthosilicate as the precursor of silica. The covalently bonded APTES on A-graphene enhances the compatibility between A-graphene and silica nanoparticles. The silica-coated A-graphene (S-graphene) sheets were incorporated to improve the thermal conductivity of epoxy. The presence of silica nanoparticles not only enhances the interfacial interaction between S-graphene and the epoxy matrix, but also alleviates the modulus mismatch between the fillers and the matrix and thus benefits the interfacial thermal conductance. The thermal conductivity of the epoxy nanocomposite with 8 wt% S-graphene is improved by 72% in comparison with that of neat epoxy, while the electrically insulating feature of the nanocomposite is retained.
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ISSN:2046-2069
2046-2069
DOI:10.1039/c4ra00518j