Tailoring aligned and densified carbon nanotube@graphene coaxial yarn for 3D thermally conductive networks

3D efficient heat dissipation is essential and critical to the high-performance thermal management systems. However, challenges remain pertaining to manufacturing controllability and consistency, as well as 3D inter-connected highly thermally conducive networks. Herein, a novel heat conduction architecture featuring high uniformity and condensity was constructed by tailoring aligned and densified carbon nanotube (CNT)@graphene oxide (GO) coaxial yarn assembled via a facile and controllable roll-dip-coating strategy into an integral whole, with extraordinary 3D interconnection of aligned highly crystalline graphene nanosheets. The unique archi-tectural features of the resulting CNT-graphene film (CGF) guaranteed adequate pathways acting as super-highways for rapid 3D heat transfer, thereby enabling a high-efficiency 3D heat dissipation behavior, with the in-plane and through-plane thermal conductivities reached as high as 804.9 and 63.8 W m-1 K-1, respectively. This work has shed light on new strategies for designing and fabricating 3D highly thermally conducive mi-crostructures toward high-efficiency thermal management systems.

Automated summary

In this study, a novel heat conduction architecture was constructed using aligned and densified carbon nanotube@graphene oxide coaxial yarns. This architecture showed high uniformity and density, enabling efficient 3D heat dissipation behavior.