Department of Chemistry, Tsinghua University, Beijing, 100084 (P. R. China).
Angew Chem Int Ed Engl. 2014 Jan 7;53(2):429-33. doi: 10.1002/anie.201308589. Epub 2013 Nov 28.
Metal-organic frameworks (MOFs) have demonstrated great potentials in a variety of important applications. To enhance the inherent properties and endow materials with multifunctionality, the rational design and synthesis of MOFs with nanoscale porosity and hollow feature is highly desired and remains a great challenge. In this work, the formation of a series of well-defined MOF (MOF-5, Fe(II) -MOF-5, Fe(III) -MOF-5) hollow nanocages by a facile solvothermal method, without any additional supporting template is reported. A surface-energy-driven mechanism may be responsible for the formation of hollow nanocages. The addition of pre-synthesized poly(vinylpyrrolidone)- (PVP) capped noble-metal nanoparticles into the synthetic system of MOF hollow nanocages yields the yolk-shell noble metal@MOF nanostructures. The present strategy to fabricate hollow and yolk-shell nanostructures is expected to open up exciting opportunities for developing a novel class of inorganic-organic hybrid functional nanomaterials.
金属-有机骨架（MOFs）在各种重要应用中表现出巨大的潜力。为了提高固有性能并赋予材料多功能性，非常需要合理设计和合成具有纳米级孔隙率和中空特征的 MOFs，但这仍然是一个巨大的挑战。在这项工作中，通过简便的溶剂热法，在没有任何额外支撑模板的情况下，制备了一系列具有明确结构的 MOF（MOF-5、Fe(II)-MOF-5、Fe(III)-MOF-5）中空纳米笼。表面能驱动机制可能是形成中空纳米笼的原因。将预先合成的聚（聚乙烯吡咯烷酮）（PVP）封端的贵金属纳米粒子添加到 MOF 中空纳米笼的合成体系中，得到了蛋黄壳型贵金属@MOF 纳米结构。这种制备中空和蛋黄壳纳米结构的策略有望为开发新型无机-有机杂化功能纳米材料开辟令人兴奋的机会。
