Tale of COF-on-MOF Composites with Structural Regulation and Stepwise Luminescence Enhancement,ACS Applied Materials & Interfaces

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Tale of COF-on-MOF Composites with Structural Regulation and Stepwise Luminescence Enhancement
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-29 , DOI: 10.1021/acsami.2c12606
Qing-Qing Xia ₁ , Xing-Huo Wang ₁ , Jia-Lin Yu ₁ , Zhi-Yuan Xue ₁ , Juan Chai ₂ , Xiaomin Liu ₁ , Ming-Xue Wu ₁

Affiliation

Integrating metal–organic framework (MOF)–covalent organic framework (COF) allows versatile engineering of hybrid materials with properties superior to pristine components, especially COFs suffered from aggregation-caused quenching (ACQ), unlocking more possibilities to improve the luminescence of COFs. In this work, we prepared various MOF@COF composites with different COF layer thicknesses, in which stable UiO-66-NH₂ served as the inner substrate and 1,3,5-benzenetricarboxaldehyde (BT), and 3,3′-dihydroxybenzidine (DH) were used to construct a COF layer. In addition to the conventional preparation method, we increased the ratio of BT and DH to be 1:2.5, and impressively, the morphologies of acquired UC (1:2.5) materials were quite different from the previous reticular structure and gradually extended from the spherical structure to the prickly structure with the increase of COF monomers. Remarkably, all of the UC materials possessed better luminescence properties than individual COF due to the limited COF layers. Meanwhile, UC-1 materials with an optimal COF layer displayed the strongest emission. In comparison with a single COF, the quantum yields of UC-1 and UC-1 (1:2.5) were increased nearly 7 times and 5 times, respectively. Moreover, the fluorescence of UC-1 materials was progressively enhanced via selective F^– sensing. This work is expected to shed light on the potential hybridization of MOF–COF with structural adjustment, morphological design, and luminescence enhancement.

中文翻译：

具有结构调节和逐步发光增强的 COF-on-MOF 复合材料的故事

将金属-有机框架 (MOF)-共价有机框架 (COF) 集成在一起，可以对性能优于原始组分的杂化材料进行多功能工程，尤其是 COF 遭受聚集引起的猝灭 (ACQ)，从而为提高 COF 的发光提供了更多可能性。在这项工作中，我们制备了具有不同 COF 层厚度的各种 MOF@COF 复合材料，其中稳定的 UiO-66-NH ₂用作内基质，1,3,5-苯三甲醛（BT）和3,3'-二羟基联苯胺（DH）用于构建COF层。除了常规的制备方法，我们将BT和DH的比例提高到1：2.5，令人印象深刻的是，获得的UC（1：2.5）材料的形态与之前的网状结构有很大不同，并逐渐从球形延伸随着COF单体的增加，结构向多刺结构转变。值得注意的是，由于有限的 COF 层，所有 UC 材料都具有比单个 COF 更好的发光性能。同时，具有最佳 COF 层的 UC-1 材料显示出最强的发射。与单个COF相比，UC-1和UC-1（1：2.5）的量子产率分别提高了近7倍和5倍。而且，^–传感。这项工作有望通过结构调整、形态设计和发光增强揭示 MOF-COF 的潜在杂交。

更新日期：2022-09-29

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