Covalent Organic Framework Film with Dynamic C═N─N/C─N═N Conjugated Backbones for Full-Spectrum UV Shielding.

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-06-19 DOI:10.1002/smll.202505917

Jingkun Li,Guoyong Jiang,Yuqi Wan,Junjie Qi,Yukihiro Ozaki,Fuwei Pi

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Abstract

Covalent organic frameworks (COFs) have garnered significant interest for applications in photocatalysis, energy storage, gas storage/separation, and optoelectronics, yet achieving high-quality COF films with high UV-shielding properties still remains a challenge. In this study, transparent COF films are successfully developed and revealed their remarkable UV-shielding capability: effectively blocking 99.9% of UV light while maintaining over 96% visible transmittance. Under UV irradiation, the COF backbone undergoes structural rearrangements between hydrazo (C═N─N) and azo (C─N═N) configurations, leading to electronic redistributions and enhanced conjugation within the framework. This adaptable COF framework efficiently absorbs and dissipates UV energy through non-radiative pathways, providing high UV-blocking properties that dramatically reduce the photooxidation rates of edible oils by up to 16.9-fold compared to uncoated controls. Additionally, the superior photostability of these COF films makes them promising next-generation UV-protective materials for safeguarding sensitive materials and equipment in high-UV environments, such as high-altitude, polar, and extraterrestrial settings.

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具有动态C = N─N/C─N = N共轭骨架的共价有机框架膜用于全光谱紫外线屏蔽。

共价有机框架（COFs）在光催化、能量存储、气体存储/分离和光电子学等领域的应用引起了人们的极大兴趣，但获得具有高紫外线屏蔽性能的高质量COF薄膜仍然是一个挑战。在本研究中，成功开发了透明COF薄膜，并展示了其卓越的紫外线屏蔽能力：有效阻挡99.9%的紫外线，同时保持超过96%的可见光透过率。在紫外线照射下，COF骨架在腙（C = N─N）和偶氮（C─N = N）构型之间发生结构重排，导致骨架内的电子重分布和共轭增强。这种适应性强的COF框架通过非辐射途径有效地吸收和消散紫外线能量，提供高紫外线阻挡性能，与未涂覆的对照相比，可显着降低食用油的光氧化率高达16.9倍。此外，这些COF薄膜优越的光稳定性使它们成为有希望的下一代紫外线防护材料，用于保护高紫外线环境下的敏感材料和设备，例如高海拔，极地和地外环境。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.