[Nano-Micro Letters] Down-Top Strategy Engineered Large-Scale Fluorographene/PBO Nanofibers Composite Papers with Excellent Wave-Transparent Performance and Thermal Conductivity
writer：Yuhan Lin, Lin Tang, Mingshun Jia, Mukun He, Junliang Zhang*, Yusheng Tang, Junwei Gu*
keywords：PBO nanofibers, Fluorinated graphene, Wave-transparency, Thermal conductivity
source：期刊
specific source：Nano-Micro Letters
Issue time：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區材料科學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.
隨著5G/6G電子通信、航空航天、交通運輸等領域中天線向小型化、高頻化發展，亟需設計制備用于雷達天線系統的兼具優異透波性能和導熱性能的聚合物基復合紙。本文采用自下而上法制備聚對苯撐苯并二噁唑前驅體納米纖維（prePNF），再與氟化石墨烯（FG）混合均勻，通過“抽濾輔助-熱壓退火”工藝制備FG/PNF復合紙。prePNF中羥基、氨基提高了FG/prePNF分散液穩定性，熱壓退火后PNF與FG間π-π相互作用增強了其相容性，該法顯著降低了PNF紙的制備時間及成本，且能實現大批量制備。FG/PNF復合紙兼具優異的透波性能和導熱性能。當FG的質量分數為40 wt%時，由自下而上法制備的FG/PNF復合紙的透波率（|T|2）達96.3%（10 GHz），面內導熱系數（λ∥）和面間導熱系數（λ⊥）分別為7.13 W/(m·K)和0.67 W/(m·K)，均優于由自上而下法制備的40 wt% FG/PNF復合紙的|T|2（95.9%，10 GHz）、λ∥（5.52 W/(m·K)）和λ⊥（0.52 W/(m·K)），也均高于純PNF紙的94.7%（10 GHz）、3.04 W/(m·K)和0.24 W/(m·K)。由自下而上法制備的40 wt% FG/PNF復合紙還展現出優異的力學性能，其拉伸強度和韌性分別達197.4 MPa和11.6 MJ/m3。