Meniscus-Guided Control of Supersaturation for the Crystallization of High Quality Metal Organic Framework Thin Films
Meniscus-Guided Control of Supersaturation for the Crystallization of High Quality Metal Organic Framework Thin Films
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DOI：
10.1021/acs.chemmater.9b01996
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发表时间：
2019-09-24
影响因子：
8.6
通讯作者：
Park, Steve
中科院分区：
文献类型：
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作者：
Lee, Jeong-Chan;Kim, Jin-Oh;Park, Steve
本文中，引入了离子束引导结晶作为生长高质量金属有机框架（MOF）薄膜的手段。在目标基板和涂布刮刀之间形成弯月面，并且通过调节各种参数如基板温度和涂布速度，精确地控制过饱和度，由此精细地调节结晶过程。因此，展示了具有厚度可调谐性低至450 nm的密集堆积的共生MOF薄膜。单个晶体在尺寸上表现出单分散性。有趣的是，使用微结构的涂布刮刀导致晶体形状的变化，归因于过饱和诱导的动力学驱动的结晶过程。我们的薄膜生长过程是大面积可扩展的，使用极少量的溶液，并具有基底通用性。这种对经由微扰引导结晶的MOF薄膜生长的洞察和展示将对未来各种基于MOF薄膜的器件的开发非常有用。
Herein, meniscus-guided crystallization is introduced as a means to grow high quality metal organic framework (MOF) thin films. A meniscus was formed between a target substrate and a coating blade, and by adjusting various parameters such as substrate temperature and coating speed, supersaturation was precisely controlled, through which the crystallization process was finely tuned. Consequently, a densely packed intergrown MOF thin film with thickness tunability down to 450 nm was demonstrated. The individual crystals exhibited monodispersity in size. Interestingly, the use of a microstructured coating blade resulted in the change of crystal shape, attributed to the supersaturation-induced kinetically driven crystallization proc-ess. Our film growth process is large-area scalable, uses a miniscule amount of solution, and has substrate versatility. Such an insight and demonstration of MOF thin-film growth via meniscus-guided crystallization will be highly useful for the development of various MOF thin-film-based devices in the future.