RGO/ANFs composite fibers with dual functions of thermal conductivity and electromagnetic shielding of lotus root structure based on sol-gel wet spinning

Textiles that exhibit electromagnetic shielding and high thermal conductivities are valuable materials. Graphene is considered the best candidate material because of its excellent thermal and electrical conductivities. However, there is a challenge that the strong interaction between the layers is easy to aggregate and affect the mechanical properties. At present, the graft modification of graphene can effectively improve its dispersion in solvents. Herein, we fabricate highly oriented composite fibers with "lotus root" structures via sol-gel wet spinning using graphene and aramid nanofiber (ANF) raw materials. The reduced graphene oxide (RGO)/ANFs composite fibers(50RGO/ANF-Ca2+-0.5) exhibit an excellent tensile fracture strength (304.05 MPa). The axial thermal conductivity of a single fiber is 30.42 W/(m·K) due to its highly oriented structure along the axis and dense three-dimensional network structure inside. Thermal infrared imaging shows that the 50RGO/ANF-Ca2+-0.5 textile has a higher surface temperature of 1.1 °C than commercial cotton fabric on human skin, and has a more significant heat dissipation capacity. The 50RGO/ANF-Ca2+-0.5 textiles exhibit electromagnetic shielding efficiencies of up to 49.8 dB. The composite fiber obtained via this low-cost preparation method endows textile with dual functions of thermal conductivity and electromagnetic shielding and has wide application prospects in emerging textiles.