Synthesis of high-performance polycrystalline metal–organic framework membranes at room temperature in a few minutes,Journal of Materials Chemistry A

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Synthesis of high-performance polycrystalline metal–organic framework membranes at room temperature in a few minutes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-04-01 , DOI: 10.1039/c9ta12027k
Jian Hao _{1,

2,

3,

4,

5} , Deepu J. Babu _{1,

2,

3,

4} , Qi Liu _{1,

2,

3,

4} , Heng-Yu Chi _{1,

2,

3,

4} , Chunxiang Lu _{5,

6,

7,

8,

9} , Yaodong Liu _{5,

6,

7,

8,

9} , Kumar Varoon Agrawal _{1,

2,

3,

4}

Affiliation

The development of a rapid and reproducible crystallization route for the synthesis of polycrystalline metal–organic framework (MOF) films is attractive for the scalable production of nanoporous membranes on porous supports. Prior crystallization studies have primarily focused on heterogeneous nucleation, and consequently, the time-consuming growth step has been overlooked. Here, we report a crystallization using sustained precursors (CUSP) route that maintains a high precursor concentration in the growth step, hindering the undesired Ostwald ripening observed in the late stage of growth. As a result, well-intergrown polycrystalline MOF films hosting a uniform grain size and a thickness of a few hundred nanometers could be obtained at room temperature in just a few minutes. Attractive gas separation performance is obtained from ZIF-8 membranes grown in 8 min with H₂/C₃H₈ selectivity of 2433 and C₃H₆/C₃H₈ selectivity of 30. The versatility of this approach is demonstrated by synthesizing a ZIF-67 membrane, as well as for the first time, a sub-1 μm-thick continuously intergrown ZIF-90 membrane, also in a few minutes, yielding H₂/CH₄ and H₂/C₃H₆ selectivities of 19.2 and 107.1, respectively. Such advances are expected to bring the scalable production of the high-performance polycrystalline MOF membranes a step closer to reality.

中文翻译：

几分钟内即可合成高性能多晶金属-有机骨架膜

为合成多晶金属-有机骨架（MOF）薄膜而开发的快速且可重现的结晶路线，对于在多孔载体上可扩展生产纳米多孔膜具有吸引力。先前的结晶研究主要集中于异相成核，因此，费时的生长步骤被忽略了。在这里，我们报告了使用持续前体（CUSP）途径进行结晶的过程，该过程在生长步骤中保持较高的前体浓度，从而阻碍了在生长后期观察到的不期望的奥斯特瓦尔德熟化。结果，在室温下仅需几分钟即可获得具有均匀晶粒尺寸和几百纳米厚度的良好共生的多晶MOF膜。₂ / C₃ H_8的选择性为2433，C₃ H₆ / C₃ H_8的选择性为30。这种方法的多功能性通过合成ZIF-67膜以及首次获得sub-1来证明。同样在数分钟内，μm厚的连续混合ZIF-90膜也分别产生了19.2和107.1的H₂ / CH₄和H₂ / C₃ H₆选择性。预期这些进展将使高性能多晶MOF膜的可扩展生产接近现实。

更新日期：2020-04-01

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