Journal
ACS APPLIED NANO MATERIALS
Volume 2, Issue 8, Pages 5342-5349Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b01366
Keywords
covalent organic framework; nanosheets; fluorescence improving; aqueous phase; detection; Al3+
Funding
- National Natural Science Foundation of China [21675078]
- Natural Science Foundation of Jiangxi Province [20165BCB 18022]
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Covalent organic framework nanosheets (COF NSs) provide well-ordered pi-pi 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.
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