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Covalent Organic Framework Nanosheets for Fluorescence Sensing via Metal Coordination
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2019-08-08 , DOI: 10.1021/acsanm.9b01366 Wei-Rong Cui 1 , Cheng-Rong Zhang 1 , Wei Jiang 1 , Ru-Ping Liang 1 , Jian-Ding Qiu 1, 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2019-08-08 , DOI: 10.1021/acsanm.9b01366 Wei-Rong Cui 1 , Cheng-Rong Zhang 1 , Wei Jiang 1 , Ru-Ping Liang 1 , Jian-Ding Qiu 1, 2
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Covalent organic framework nanosheets (COF NSs) provide well-ordered π–π structures that can be used to develop luminescent materials. However, most COF NSs have problems of weak luminescence and low fluorescence quantum yield. In this work, we prepared covalent organic framework nanosheets (Bpy-NSs) with good water dispersibility, nitrogen-rich functional groups, and regular pore structure. We explored the coordination of Bpy-NSs with Al3+ to eliminate the fluorescence quenching process caused by photoinduced electron transfer (PET). Thus, the fluorescence “turn-on” signal linearly increases with Al3+ concentration, achieving a 15.7-fold improved in fluorescence, and the absolute fluorescence quantum yield increased from 0.15 to 1.74%. Furthermore, this is the first COF fluorescence sensor that can be used for high sensitivity and selectivity detection of Al3+ in the aqueous phase. We anticipate that the expansion of metal ions coordination strategy in the aqueous phase will not only significantly enhance the fluorescence of COF NSs but also extend the functional range of COF NSs.
中文翻译：
通过金属配位进行荧光传感的共价有机骨架纳米片
共价有机骨架纳米片（COF NSs）提供了可用于开发发光材料的有序π-π结构。然而，大多数COF NS具有发光弱和荧光量子产率低的问题。在这项工作中，我们制备了具有良好水分散性，富氮官能团和规则孔结构的共价有机骨架纳米片（Bpy-NSs）。我们探索了Bpy-NS与Al 3+的配位，以消除由光诱导电子转移（PET）引起的荧光猝灭过程。因此，荧光“开启”信号随Al 3+线性增加荧光浓度提高了15.7倍，并且绝对荧光量子产率从0.15增加到1.74％。此外，这是第一款可用于水相中Al 3+的高灵敏度和选择性检测的COF荧光传感器。我们预期在水相中扩展金属离子配位策略不仅会显着增强COF NSs的荧光，而且会扩展COF NSs的功能范围。
更新日期：2019-08-09
中文翻译：
通过金属配位进行荧光传感的共价有机骨架纳米片
共价有机骨架纳米片（COF NSs）提供了可用于开发发光材料的有序π-π结构。然而，大多数COF NS具有发光弱和荧光量子产率低的问题。在这项工作中，我们制备了具有良好水分散性，富氮官能团和规则孔结构的共价有机骨架纳米片（Bpy-NSs）。我们探索了Bpy-NS与Al 3+的配位，以消除由光诱导电子转移（PET）引起的荧光猝灭过程。因此，荧光“开启”信号随Al 3+线性增加荧光浓度提高了15.7倍，并且绝对荧光量子产率从0.15增加到1.74％。此外，这是第一款可用于水相中Al 3+的高灵敏度和选择性检测的COF荧光传感器。我们预期在水相中扩展金属离子配位策略不仅会显着增强COF NSs的荧光，而且会扩展COF NSs的功能范围。
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