Freestanding nanopapers were fabricated by the assembly of metal–organic frameworks (MOFs) onto cellulose nanofibers (CNFs). The CNFs are wrapped by continuously nucleated MOF layers (CNF@MOF) by interfacial synthesis, with the charge density on the surface of the CNFs and the dosage of the surfactant polyvinylpyrrolidone (PVP) being carefully adjusted. The obtained CNF@MOF nanofibers with long‐range, continuous, hybrid nanostructures were very different to the composites formed by aggregation of MOF nanoparticles on the substrates. Four typical MOFs (HKUST‐1, Al‐MIL‐53, Zn‐MOF‐74, ZIF‐CO₃‐1) were successfully grown onto CNFs in aqueous solutions and further fabricated into freestanding nanopapers. Because of their unique nanostructures and morphologies, the corresponding flexible nanopapers exhibit hierarchical meso‐micropores, high optical transparency, high thermal stability, and high mechanical strength. A proof‐of‐concept study shows that the CNF@MOF nanopapers can be used as efficient filters to separate volatile organic compounds (VOCs) from the air. This work provides a new path for structuring MOF materials that may boost their practical application.

中文翻译：

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纤维素纳米纤维的高度透明，柔性和机械强度高的纳米纸@金属有机框架

独立式纳米纸是通过将金属有机框架（MOF）组装到纤维素纳米纤维（CNF）上而制成的。CNF被界面合成的连续成核的MOF层（CNF @ MOF）包裹，CNF表面上的电荷密度和表面活性剂聚乙烯吡咯烷酮（PVP）的剂量被仔细调节。获得的具有长程，连续，杂化纳米结构的CNF @ MOF纳米纤维与通过MOF纳米颗粒在基底上聚集形成的复合材料非常不同。四种典型的MOF（HKUST-1，Al-MIL-53，Zn-MOF-74，ZIF-CO ₃‐1）在水溶液中成功生长在CNF上，并进一步制成独立的纳米纸。由于它们独特的纳米结构和形态的，相应的柔性纳米纸表现出分层内消旋-micropores，高光学透明性，高的热稳定性和高的机械强度。概念验证研究表明，CNF @ MOF纳米纸可以用作有效过滤器，以从空气中分离出挥发性有机化合物（VOC）。这项工作为结构化MOF材料提供了一条新途径，这可能会促进它们的实际应用。