High thermal conductivity graphene-based interfacial materials through oriented assembly and catalytic graphitization for thermal management

Graphene, with its excellent thermal conductivity, is ideal for heat dissipation in small electronic devices. In this study, we propose a method that combines magnetic field-induced assembly and catalytic graphitization to enhance the thermal conductivity of graphene films. Fe₃O₄ was loaded onto graphene oxide (GO) to form magnetic graphene oxide (MGO), which was aligned into an ordered structure under the influence of an external magnetic field. Glucose was then added as a carbon source and thermally reduced at 800 °C to fill defects in the MGO films and reduce phonon scattering. Catalytic graphitization using Fe as a catalyst at 1500 °C converted the amorphous carbon to graphitic carbon, further minimizing phonon scattering. Finally, a second graphitization at 1800 °C was performed to repair structural defects, resulting in a thermal conductivity of 1004.4 W m⁻ 1  K⁻ 1 significantly higher than that of the graphene film obtained by reducing GO under the same conditions (420.2 W m⁻ 1  K⁻ 1 ). This energy-efficient approach offers a promising method for preparing high-thermal-conductivity graphene-based materials for future applications.