▎ 摘　　要

Graphene fluoride (GF), a new graphene derivative, is an excellent candidate for thermal management applications, given its exceptional thermal conductivity and superb insulation properties. However, the fabrication of the vertically aligned graphene fluoride (VA-GF) sheet network is challenging due to its hydrophobic property and complicated surface modification process. In this work, the freeze-casting method was used to create VA-GF scaffolds incorporating polyethyleneimine (PEI) as the dispersing agent and binder. Benefiting from the vertical alignment of the GF scaffold, the epoxy composites exhibited the through-plane thermal conductivity (TC) of 0.96 W m(-1) K-1 at 15 vol% of GF loading, corresponding to 465% and 146% enhancement over pure epoxy and randomly distributed GF/epoxy composites, respectively. As a function of frequency, the electrical conductivity of VA-GF/epoxy composites was also explored at different filler contents. With increasing GF content and frequency, the electrical conductivity of the composites rose from 10(-9) to 10(-8) S m(-1) between 10(3) and 10(6) Hz, demonstrating an insulating property of materials. The vertical alignment of GF in a polymer matrix provides an opportunity for the creation of composites with exceptional thermal conductivity in a through-plane direction and electrical insulation properties, which promotes the development of thermal management materials for electronic devices.