作者：Yuhan Lin, Lin Tang, Mingshun Jia, Mukun He, Junliang Zhang*, Yusheng Tang, Junwei Gu*
关键字：PBO nanofibers, Fluorinated graphene, Wave-transparency, Thermal conductivity
论文来源：期刊
具体来源：Nano-Micro Letters
发表时间：2025年

Yuhan Lin, Lin Tang, Mingshun Jia, Mukun He, Junliang Zhang*, Yusheng Tang, Junwei Gu*. Down-Top Strategy Engineered Large-Scale Fluorographene/PBO Nanofibers Composite Papers with Excellent Wave-Transparent Performance and Thermal Conductivity. Nano-Micro Letters, 2026, 18: 35. 2024IF=36.3.（1区材料科学Top期刊）

https://doi.org/10.1007/s40820-025-01878-y

Abstract

With the miniaturization and high-frequency evolution of antennas in 5G/6G communications, aerospace, and transportation, polymer composite papers integrating superior wave-transparent performance and thermal conductivity for radar antenna systems are urgently needed. Herein, a down-top strategy was employed to synthesize poly(p-phenylene benzobisoxazole) precursor nanofibers (prePNF). The prePNF was then uniformly mixed with fluorinated graphene (FG) to fabricate FG/PNF composite papers through consecutively suction filtration, hot-pressing, and thermal annealing. The hydroxyl and amino groups in prePNF enhanced the stability of FG/prePNF dispersion, while the increased π-π interactions between PNF and FG after annealing improved their compatibility. The preparation time and cost of PNF paper was significantly reduced when applying this strategy, which enabled its large-scale production. Furthermore, the prepared FG/PNF composite papers exhibited excellent wave-transparent performance and thermal conductivity. When the mass fraction of FG was 40 wt%, the FG/PNF composite paper prepared via the down-top strategy achieved the wave-transparent coefficient (|T|²) of 96.3% under 10 GHz, in-plane thermal conductivity (λ_∥) of 7.13 W m^-1 K^-1, and through-plane thermal conductivity (λ_⊥) of 0.67 W m^-1 K^-1, outperforming FG/PNF composite paper prepared by the top-down strategy (|T|² = 95.9%, λ_∥ = 5.52 W m^-1 K^-1, λ_⊥ = 0.52 W m^-1 K^-1) and pure PNF paper (|T|² =94.7%, λ_∥ =3.04 W m^-1 K^-1, λ_⊥ = 0.24 W m^-1 K^-1). Meanwhile, FG/PNF composite paper (with 40 wt% FG) through the down-top strategy also demonstrated outstanding mechanical properties with tensile strength and toughness reaching 197.4 MPa and 11.6 MJ m^-3, respectively.

随着5G/6G电子通信、航空航天、交通运输等领域中天线向小型化、高频化发展，亟需设计制备用于雷达天线系统的兼具优异透波性能和导热性能的聚合物基复合纸。本文采用自下而上法制备聚对苯撑苯并二噁唑前驱体纳米纤维（prePNF），再与氟化石墨烯（FG）混合均匀，通过“抽滤辅助-热压退火”工艺制备FG/PNF复合纸。prePNF中羟基、氨基提高了FG/prePNF分散液稳定性，热压退火后PNF与FG间π-π相互作用增强了其相容性，该法显著降低了PNF纸的制备时间及成本，且能实现大批量制备。FG/PNF复合纸兼具优异的透波性能和导热性能。当FG的质量分数为40 wt%时，由自下而上法制备的FG/PNF复合纸的透波率（|T|²）达96.3%（10 GHz），面内导热系数（λ_∥）和面间导热系数（λ_⊥）分别为7.13 W/(m·K)和0.67 W/(m·K)，均优于由自上而下法制备的40 wt% FG/PNF复合纸的|T|²（95.9%，10 GHz）、λ_∥（5.52 W/(m·K)）和λ_⊥（0.52 W/(m·K)），也均高于纯PNF纸的94.7%（10 GHz）、3.04 W/(m·K)和0.24 W/(m·K)。由自下而上法制备的40 wt% FG/PNF复合纸还展现出优异的力学性能，其拉伸强度和韧性分别达197.4 MPa和11.6 MJ/m³。