Aramid fibers are widely used in many cutting-edge fields, including space, aviation, military, and electronics. However, their poor UV resistance and surface inertness seriously hinder their utilization, especially in harsh environments. Here, a dual-layer ultrathin Al₂O₃–TiO₂ coating with a thickness of 70–180 nm is fabricated on aramid fibers by a modified atomic layer deposition (ALD) method. The tenacity of ALD-coated aramid fibers decreases only by ≈0.85% after exposure to intense UV light (4260 W m⁻²) under high temperature (>200 ℃) for 90 min, which equals to continuous exposure to sunlight for about 17 500 days. The as-prepared aramid fibers also show excellent laundering durability, thermal and chemical stabilities. This work presents a green and damage-free approach to achieve the highly anti-UV aramid fibers without sacrificing their outstanding performance, which is expected to guide material design for future innovations in functional fibers and devices.

中文翻译：

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无与伦比的芳纶纤维装甲，在极端环境下具有出色的抗紫外线性能

芳纶纤维广泛应用于航天、航空、军事、电子等诸多前沿领域。然而，它们较差的抗紫外线性和表面惰性严重阻碍了它们的利用，尤其是在恶劣的环境中。在这里，通过改进的原子层沉积（ALD）方法在芳纶纤维上制备了厚度为 70-180 nm的双层超薄 Al ₂ O ₃ -TiO ₂涂层。暴露于强紫外线 (4260 W m ^-2) 高温（>200 ℃）下 90 分钟，相当于连续暴露在阳光下约 17 500 天。制备的芳纶纤维还表现出优异的耐洗性、热稳定性和化学稳定性。这项工作提出了一种绿色、无损伤的方法，可以在不牺牲其出色性能的情况下实现高度抗紫外线的芳纶纤维，有望指导未来功能纤维和设备创新的材料设计。