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Creation of metal–organic framework nanosheets by the Langmuir-Blodgett technique
Coordination Chemistry Reviews ( IF 20.6 ) Pub Date : 2022-06-22 , DOI: 10.1016/j.ccr.2022.214650
Rie Makiura

Over the past decade, significant progress has been made in research on metal–organic frameworks (MOFs) – highly ordered microporous materials composed of metal ions and organic linkers – resulting in an increased understanding of the relationship between framework structure/components and performance in various applications in diverse fields such as electronics, energy creation/storage and biomaterials. For most potential applications, organizing MOFs into two-dimensional (2D) thin films – nanosheets – is necessary. In order to create MOF nanosheets, two experimental approaches have been developed: top-down and bottom-up and most review papers on MOF nanosheets deal with these two methods. In this review, I focus on the bottom-up approach for creation of MOF nanosheets, a simple process with one or few steps that potentially offers access to large nanosheets with macroscopic continuity. Especially, the Langmuir-Blodgett (LB) methodology utilizing air/liquid interfaces is sequentially discussed. Because of the ultrathin state of nanosheets, characterization methods of MOF nanosheets often differ from those employed for bulk MOF crystals conducted with conventional techniques. Therefore, representative and useful techniques to determine nanosheet characteristics are explained in detail. Following that, I discuss the structural and morphological development of porphyrin- and triphenylene-based MOF nanosheets that critically influences their chemical/physical properties. Finally, I describe challenges and perspectives related to the LB synthesis towards further understanding of the growth mechanism at the interfaces, leading to extensive applications of MOF nanosheets.



中文翻译:

通过 Langmuir-Blodgett 技术创建金属有机框架纳米片

在过去的十年中,金属-有机框架(MOFs)的研究取得了重大进展——由金属离子和有机连接体组成的高度有序的微孔材料——从而加深了对各种框架结构/组分与性能之间关系的理解。在电子、能源创造/储存和生物材料等不同领域的应用。对于大多数潜在的应用,将 MOF 组织成二维 (2D) 薄膜 - 纳米片 - 是必要的。为了制造 MOF 纳米片,已经开发了两种实验方法:自上而下和自下而上,大多数关于 MOF 纳米片的评论论文都涉及这两种方法。在这篇评论中,我专注于创建 MOF 纳米片的自下而上的方法,一个简单的过程,只需一个或几个步骤,就有可能获得具有宏观连续性的大型纳米片。特别是,依次讨论了利用空气/液体界面的 Langmuir-Blodgett (LB) 方法。由于纳米片的超薄状态,MOF 纳米片的表征方法通常不同于用传统技术进行的块状 MOF 晶体的表征方法。因此,详细解释了确定纳米片特性的代表性和有用的技术。之后,我讨论了卟啉基和苯并三苯基 MOF 纳米片的结构和形态发展,这对它们的化学/物理性质有重要影响。最后,我描述了与 LB 合成相关的挑战和观点,以进一步了解界面的生长机制,

更新日期:2022-06-22
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