[Nano-Micro Letters] Down-Top Strategy Engineered Large-Scale Fluorographene/PBO Nanofibers Composite Papers with Excellent Wave-Transparent Performance and Thermal Conductivity
作者：Yuhan Lin, Lin Tang, Mingshun Jia, Mukun He, Junliang Zhang*, Yusheng Tang, Junwei Gu*
關(guān)鍵字：PBO nanofibers, Fluorinated graphene, Wave-transparency, Thermal conductivity
論文來源：期刊
具體來源：Nano-Micro Letters
發(fā)表時(shí)間：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(qū)材料科學(xué)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(yùn)輸?shù)阮I(lǐng)域中天線向小型化、高頻化發(fā)展，亟需設(shè)計(jì)制備用于雷達(dá)天線系統(tǒng)的兼具優(yōu)異透波性能和導(dǎo)熱性能的聚合物基復(fù)合紙。本文采用自下而上法制備聚對(duì)苯撐苯并二噁唑前驅(qū)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(fù)合紙。prePNF中羥基、氨基提高了FG/prePNF分散液穩(wěn)定性，熱壓退火后PNF與FG間π-π相互作用增強(qiáng)了其相容性，該法顯著降低了PNF紙的制備時(shí)間及成本，且能實(shí)現(xiàn)大批量制備。FG/PNF復(fù)合紙兼具優(yōu)異的透波性能和導(dǎo)熱性能。當(dāng)FG的質(zhì)量分?jǐn)?shù)為40 wt%時(shí)，由自下而上法制備的FG/PNF復(fù)合紙的透波率（|T|2）達(dá)96.3%（10 GHz），面內(nèi)導(dǎo)熱系數(shù)（λ∥）和面間導(dǎo)熱系數(shù)（λ⊥）分別為7.13 W/(m·K)和0.67 W/(m·K)，均優(yōu)于由自上而下法制備的40 wt% FG/PNF復(fù)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(fù)合紙還展現(xiàn)出優(yōu)異的力學(xué)性能，其拉伸強(qiáng)度和韌性分別達(dá)197.4 MPa和11.6 MJ/m3。