Despite the extensive potential of zeolitic imidazolate framework (ZIF) membranes in gas separation, the development of continuous, oriented ZIF membranes onto a polymeric substrate remains a significant challenge. This is presumably due to weak adhesion, and insufficient heterogeneous nucleation sites on the polymer surface. Herein, a layer of horizontally aligned poly(sodium‐4‐styrene sulfonate)‐modified halloysite nanotubes (PSS‐HNTs) with ample nucleation sites was used for templated growth of vertically oriented Zn‐ZIF‐L layers. Then we successfully developed the first well‐intergrown membranes of Co‐ZIF‐L on Zn‐ZIF‐L layers via heteroepitaxial growth. The stepwise deposition was utilized for the control of ZIF films orientation to avoid random nucleation and twins overgrowth. The integration of preferred vertical orientation and optimized grain boundary structure endowed the Co/Zn‐ZIF‐L membranes with a remarkable gas separation performance (CO₂ permeance: 244.9 GPU, and CO₂/N₂ selectivity: 17.8). Our methodology provides a useful guideline to design mixed‐component, vertically oriented ZIF‐L to improve gas separation performance.

中文翻译：

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垂直取向的沸石咪唑盐骨架-L（Co / Zn-ZIF-L）分子筛膜的异质外延生长

尽管沸石咪唑盐骨架（ZIF）膜在气体分离中具有广阔的潜力，但将连续的定向ZIF膜开发到聚合物基材上仍然是一项重大挑战。据推测这是由于粘附力弱，以及聚合物表面上的异质成核位置不足所致。本文中，使用水平排列的聚（4-苯乙烯磺酸钠）修饰的埃洛石纳米管（PSS-HNTs）层，其具有足够的成核位点，用于垂直定向的Zn-ZIF-L层的模板生长。然后，我们通过异质外延生长成功地在Zn-ZIF-L层上成功开发了Co-ZIF-L的第一个良好共生的膜。逐步沉积被用于控制ZIF膜的取向，以避免随机成核和孪晶过度生长。₂渗透率：244.9 GPU，CO ₂ / N ₂选择性：17.8）。我们的方法学为设计混合成分，垂直取向的ZIF-L以改善气体分离性能提供了有用的指导。