Down-Top Strategy Engineered Large-Scale Fluorographene/PBO Nanofibers Composite Papers with Excellent Wave-Transparent Performance and Thermal Conductivity

Highlights: The down-top strategy enables large-scale production of poly(p-phenylene benzobisoxazole) nanofiber (PNF) paper with excellent intrinsic wave-transparent performance, thermal conductivity, and mechanical strength while significantly reduces the preparation time and cost. Fluorinated graphene (FG)/PNF composite papers exhibit superior wave-transparent performance and thermal conductivity. When the mass fraction of FG is 40 wt%, its |T|² reaches 96.3% under 10 GHz while λ_∥ and λ_⊥ increase to 7.13 and 0.67 W m^-1 K^-1, respectively. FG/PNF composite paper with 40 wt% of FG also displays excellent mechanical properties, with the tensile strength and toughness reaching 197.4 MPa and 11.6 MJ m^-3, respectively.