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Volume 13
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10.3390/nano13152243
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Article

Thermally Conductive and Electrically Insulating Epoxy Composites Filled with Network-like Alumina In Situ Coated Graphene

by
Ruicong Lv
1,
Haichang Guo
1,
Lei Kang
1,
Akbar Bashir
1,
Liucheng Ren
1,
Hongyu Niu
1 and
Shulin Bai
1,2,*
1
School of Materials Science and Engineering, HEDPS/Center for Applied Physics and Technology, Peking University, Beijing 100871, China
2
Peking University Nanchang Innovation Institute, 14#1–2 Floor, High-Level Talent Industrial Park, High-Tech District, Nanchang 330000, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2023, 13(15), 2243; https://doi.org/10.3390/nano13152243
Submission received: 26 June 2023 / Revised: 28 July 2023 / Accepted: 28 July 2023 / Published: 3 August 2023
(This article belongs to the Special Issue Functional Micro-/Nanostructures: Advanced Fabrication and Application)
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Abstract

With the rapid development of the electronics industry, there is a growing demand for packaging materials that possess both high thermal conductivity (TC) and low electrical conductivity (EC). However, traditional insulating fillers such as boron nitride, aluminum nitride, and alumina (Al2O3) have relatively low intrinsic TC. When graphene, which exhibits both superhigh TC and EC, is used as a filler to fill epoxy resin, the TC of blends can be much higher than that of blends containing more traditional fillers. However, the high EC of graphene limits its application in cases where electrical insulation is required. To address this challenge, a method for coating graphene sheets with an in situ grown Al2O3 layer has been proposed for the fabrication of epoxy-based composites with both high TC and low EC. In the presence of a cationic surfactant, a dense Al2O3 layer with a network structure can be formed on the surface of graphene sheets. When the total content of Al2O3 and graphene mixed filler reached 30 wt%, the TC of the epoxy composite reached 0.97 W m−1 K−1, while the EC remained above 1011 Ω·cm. Finite element simulations accurately predicted TC and EC values in accordance with experimental results. This material, with its combination of high TC and good insulation properties, exhibits excellent potential for microelectronic packaging applications.
Keywords: graphene; alumina; epoxy composite; thermal conductivity; insulation graphene; alumina; epoxy composite; thermal conductivity; insulation

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MDPI and ACS Style

Lv, R.; Guo, H.; Kang, L.; Bashir, A.; Ren, L.; Niu, H.; Bai, S. Thermally Conductive and Electrically Insulating Epoxy Composites Filled with Network-like Alumina In Situ Coated Graphene. Nanomaterials 2023, 13, 2243. https://doi.org/10.3390/nano13152243

AMA Style

Lv R, Guo H, Kang L, Bashir A, Ren L, Niu H, Bai S. Thermally Conductive and Electrically Insulating Epoxy Composites Filled with Network-like Alumina In Situ Coated Graphene. Nanomaterials. 2023; 13(15):2243. https://doi.org/10.3390/nano13152243

Chicago/Turabian Style

Lv, Ruicong, Haichang Guo, Lei Kang, Akbar Bashir, Liucheng Ren, Hongyu Niu, and Shulin Bai. 2023. "Thermally Conductive and Electrically Insulating Epoxy Composites Filled with Network-like Alumina In Situ Coated Graphene" Nanomaterials 13, no. 15: 2243. https://doi.org/10.3390/nano13152243

APA Style

Lv, R., Guo, H., Kang, L., Bashir, A., Ren, L., Niu, H., & Bai, S. (2023). Thermally Conductive and Electrically Insulating Epoxy Composites Filled with Network-like Alumina In Situ Coated Graphene. Nanomaterials, 13(15), 2243. https://doi.org/10.3390/nano13152243

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