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Surface-tension-confined assembly of a metal–organic framework in femtoliter droplet arrays†
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1039/c7ra13250f
Zhongsheng Wu 1 , Yinyin Lin 1 , Juanjuan Xing 2 , Mengying Zhang 3 , Jinbo Wu 1
Affiliation  

Metal–organic frameworks (MOFs), produced by metal ions coordinated to organic linkers, have attracted increasing attention in recent years. For the utilization in MOFs in numerous applications, achieving positioned MOF growth on surfaces is essential to fabricate multiple-functional devices. We develop a novel miniaturized method to realize surface-tension-confined assembly of HKUST-1 in femtoliter droplet arrays. HKUST-1 crystal arrays grown by evaporation-induced crystallization are observed, and five typical crystal morphologies (i.e., hexagonal, irregular hexagonal, triangular, arc-like and ribbon-like crystals) are found in the large area on the patterned substrate during crystallization. Our research provides a better understanding of the formation mechanism of MOF crystals in confined sessile droplets. The key factors determining HKUST-1 single-crystal growth are the internal flows in an evaporating droplet and consequently aggregation induced by the combination of metallic Cu(II) and BTC ions. Understanding the formation of different morphologies of HKUST-1 crystals is useful to guide the production of crystals with desired shapes for various applications.

中文翻译:

飞升液滴阵列中金属-有机框架的表面张力限制组装†

近年来,由金属离子与有机连接体配位产生的金属有机框架(MOFs)引起了越来越多的关注。为了在众多应用中使用 MOF,在表面上实现定位的 MOF 生长对于制造多功能器件至关重要。我们开发了一种新颖的小型化方法来实现 HKUST-1 在飞升液滴阵列中的表面张力限制组装。观察通过蒸发诱导结晶生长的 HKUST-1 晶体阵列,并发现了五种典型的晶体形态(、六角形、不规则六角形、三角形、弧形和带状晶体)在结晶过程中在图案化基板上的大面积上发现。我们的研究有助于更好地理解受限固着液滴中 MOF 晶体的形成机制。决定 HKUST-1 单晶生长的关键因素是蒸发液滴中的内部流动以及因此由金属 Cu( II ) 和 BTC 离子结合引起的聚集。了解 HKUST-1 晶体不同形态的形成有助于指导生产具有各种应用所需形状的晶体。
更新日期:2018-01-18
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