Thermal Percolation Threshold and Thermal Properties of Composites with Graphene and Boron Nitride Fillers

• DOI: 10.48550/arxiv.1807.03698
• Publication Date: 2018-01-01
• Authors: Fariborz Kargar; Zahra Barani; Jacob Lewis; Bishwajit Debnath; Ruben Salgado; Ece Aytan; Roger K. Lake; Alexander A. Bala...
• Keywords: Percolation (cognitive psychology); Exfoliated graphite nano-platelets

We investigated thermal properties of the epoxy-based composites with a high loading fraction - up to f=45 vol.% randomly oriented electrically conductive graphene fillers and insulating boron nitride fillers. It was found that both types revealed distinctive percolation threshold at f>20 vol.%. The required for achieving substantially higher than electrical percolation. Graphene outperformed in conductivity enhancement. established transport filler loading, above threshold, is dominated by heat conduction via network percolating Unexpectedly, we determined were influenced strongly cross-plane quasi-two-dimensional obtained results shed light on debated mechanism percolation, facilitate development next generation efficient interface materials electronic applications.