Jin-Zhou Liu, Rui-Xian Zhao, Qian-Wei Yin, Hai-Chi Zhang, Rong Sheng Li, Jian Ling, Qiue Cao
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引用次数: 0
摘要
卤化铅包晶纳米晶体（PNCs）因其优异的光电特性而备受关注。本研究采用阴离子交换法制备了一系列水稳定性 CsPb(Br/I)3 PNCs 荧光探针。有趣的是，通过控制阴离子交换中 KI 的浓度来调节 PNCs 探针的荧光光谱，可以提高对 AA 的检测选择性。CsPb(Br/I)3 PNCs 的高灵敏度和高选择性特点使其成为 AA 检测的理想材料。研究发现，CsPb(Br/I)3 PNCs FL 增强的原因是 AA 引起了 CsPb(Br/I)3 PNCs 的聚集。这种通过调整光谱来提高探针对底物的选择性的策略将大大拓展 PNCs 在分析和检测领域的应用。
Selective detection of ascorbic acid by tuning the composition and fluorescence of the cesium lead halide perovskite nanocrystals.
Lead halide perovskite nanocrystals (PNCs) have attracted intense attention due to their excellent optoelectronic properties. In this work, a series of water-stable CsPb(Br/I)3PNCs fluorescent probes were prepared using an anion exchange method. It was found that the PNCs probes could be used to detect ascorbic acid (AA) in water, and interestingly, the FL spectra of the PNCs probes can be adjusted by controlling the concentration of KI in anion exchange to improve the detection selectivity of AA. The high sensitivity and selectivity make CsPb(Br/I)3PNCs an ideal material for AA sensing. The concentration of AA can be linearly measured in the range from 0.01 to 50μM, with a detection limit of 4.2 nM. The reason for the enhanced FL of CsPb(Br/I)3PNCs was studied, and it is considered that AA causes the aggregation of CsPb(Br/I)3PNCs. This strategy of improving the selectivity of the probe to the substrate by adjusting the spectrum will significantly expand the application of PNCs in the field of analysis and detection.
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Methods and Applications in Fluorescence focuses on new developments in fluorescence spectroscopy, imaging, microscopy, fluorescent probes, labels and (nano)materials. It will feature both methods and advanced (bio)applications and accepts original research articles, reviews and technical notes.
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