抗坏血酸
荧光
猝灭(荧光)
热液循环
硫黄
选择性
水热合成
材料科学
离子
化学
无机化学
光化学
化学工程
催化作用
有机化学
冶金
物理
食品科学
量子力学
工程类
作者
Wei Fu,Jia Ma,Zirui Qiao,Li Xu,Liangying Wang,Min Liu,Xingqin Fu,Gang Li,Chenyu Han,Jian Zhang,Jun-Cheng Jin
出处
期刊:Langmuir
[American Chemical Society]
日期:2023-11-07
卷期号:39 (46): 16349-16357
标识
DOI:10.1021/acs.langmuir.3c02079
摘要
In this work, the ultrasound-assisted hydrothermal synthesis method offers a facile method to synthesize highly efficient photoluminescence sulfur quantum dots (SQDs). Impressively, a switchable fluorescent "on-off-on" sensor was developed using the acquired SQDs, which are capable of sequentially detecting iron ions (Fe3+) and ascorbic acid (AA) with exceptional sensitivity and selectivity. Meanwhile, SQDs and Fe3+ formed complexes through coordination, causing the fluorescence quenching of SQDs because of the static quenching effect. Upon the addition of AA into the SQDs/Fe3+ system, a redox-reaction-mediated mechanism leads to the recovery of fluorescence. The fluorescence intensity of SQDs exhibits a linear relationship with the concentrations of Fe3+ and AA in the ranges 5-30 and 20-100 μM, respectively. Notably, the detection limits achieved are 14.31 nM for Fe3+ and 0.64 μM for AA. Moreover, the chemosensor was successfully employed for monitoring Fe3+ in real water samples and AA in fruits. These results demonstrate the excellent analysis and detection capabilities of SQDs in the complex environment.
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