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Thermal and electrical conductivity of a graphene-based hybrid filler epoxy composite

Nouri Borujerdi, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1007/s10853-021-06272-8
  3. Publisher: Springer , 2021
  4. Abstract:
  5. The development of polymer-based composites with thermal transport capability has now become essential in response to the efficient thermal management required in electronic and energy conversion devices. In this work, a novel hybrid filler consisting of graphene nanoplatelet (GNP) and boron nitride microparticles (micro-BN) is used to improve the thermal conductivity of epoxy composite. The GNPs with an average lateral size of 8 µm and an average thickness of 5 nm are in the same volume range with the 1 µm size micro-BN particles. According to the results, the thermal conductivity of the composites changes abruptly with increasing micro-BN loading at fixed GNP loading, which is attributed to the formation of a percolative network through the composite. By using 20% vol. hybrid filler, the thermal conductivity of epoxy increases from 0.22 to 5.64 W/m K, which is 147% higher than the thermal conductivity of GNP composite due to the synergistic effect. Finally, as a secondary filler in the GNP epoxy composite, nano-BN is compared with the micro-BN. It is observed that for thermal conductivity enhancement, the addition of nano-BN is not as effective as micro-BN. On the other sides, unlike nano-BN, by adding of micro-BN, the electrical conductivity of GNP epoxy composite does not change significantly. It is found that for the size of the GNPs used here, 1 µm size of micro-BN is an optimized value that leads to the formation of a strong percolated network of fillers through the composite. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. Conversion efficiency ; Electric conductivity ; Fillers ; Graphene ; III-V semiconductors ; Electrical conductivity ; Energy conversion devices ; Percolated network ; Polymer based composite ; Synergistic effect ; Thermal and electrical conductivity ; Thermal conductivity enhancement ; Thermal transport ; Thermal conductivity
  8. Source: Journal of Materials Science ; Volume 56, Issue 27 , 2021 , Pages 15151-15161 ; 00222461 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10853-021-06272-8