Construction of Free-Standing MOF Sheets through Electrochemical Printing on Superhydrophobic Substrates
Construction of Free-Standing MOF Sheets through Electrochemical Printing on Superhydrophobic Substrates
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DOI：
10.1021/acsmaterialslett.1c00815
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发表时间：
2022-03
影响因子：
11.4
通讯作者：
Yupeng Chen;Zhongpeng Zhu;Xiangyu Jiang;Lei Jiang
中科院分区：
文献类型：
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作者：
Yupeng Chen;Zhongpeng Zhu;Xiangyu Jiang;Lei Jiang
金属有机骨架膜在分离、检测、防腐、能量捕获与转换等领域具有重要的应用前景，但自支撑金属有机骨架膜的制备困难阻碍了其应用。在这里，我们提出了一种简单的策略，通过电化学印刷在超疏水微柱结构的基底上制造具有易剥离和易转移特性的独立的MOF片材。在电化学印刷过程中，电泳沉积将沿着这些基底上的固/液/气三相界面发生。首先，电泳沉积条件，如沉积时间和电流，对厚度控制的超疏水衬底上的生长的影响进行了探索。然后，系统地研究了微柱的直径、间距等几何参数以及微柱的润湿性对构建自支撑MOF片材的影响。此外，MOF片材表现出毛细管辅助从超疏水基底剥离和铺展辅助转移到超亲水基底的性质，随后展示了通用性。因此，利用电化学印刷在超疏水基底上制备具有易剥离和易转移特性的自支撑MOF片材是一种简便的方法，推动了生产率的提高和在各个领域的相应应用。
Metal–organic framework (MOF) membranes have significant application prospects in different fields, such as separation, detection, anticorrosion and energy capture and conversion and so on. However, the difficulty of constructing free-standing MOF membranes has hindered their applications. Here, we propose a facile strategy to fabricate free-standing MOF sheets with easy-peeling and easy-transfer properties through electrochemical printing on superhydrophobic micropillar-structured substrates. During the electrochemical printing process, electrophoretic deposition will occur along the solid/liquid/gas triphase interface on these substrates. First, the effects of the electrophoretic deposition conditions, such as deposition time and current, on the thickness-controlled growth on superhydrophobic substrates are explored. Then, the influences of the geometric parameters, such as diameter and distance, and wettability of the micropillars on constructing free-standing MOF sheets are systematically studied. Furthermore, the MOF sheets exhibit the properties of capillarity-assisted peeling from superhydrophobic substrates and spreading-assisted transfer to superhydrophilic substrates, followed by the demonstration of the generality. Therefore, it is a facile method to prepare free-standing MOF sheets with easy-peeling and easy-transfer properties taking advantage of electrochemical printing on superhydrophobic substrates, giving impetus to the improvement of the productivity and the corresponding applications in various fields.