Dual-Emission Fluorescence Probe Based on CdTe Quantum Dots and Rhodamine B for Visual Detection of Mercury and Its Logic Gate Behavior

被引：11
作者：
Gao, Yuefeng [1 ]
Xu, Sai [2 ]
Liu, Zhijian [1 ]
Yu, Kezhen [1 ]
Pan, Xinxiang [1 ,3 ]
机构：
[1] Dalian Maritime Univ, Coll Marine Engn, Dalian 116026, Peoples R China
[2] Dalian Maritime Univ, Sch Sci, Dalian 116026, Peoples R China
[3] Guangdong Ocean Univ, Maritime Coll, Zhanjiang 524088, Peoples R China
来源：
MICROMACHINES | 2021年 / 12卷 / 06期
基金：
中国国家自然科学基金;
关键词：
CdTe quantum dots; fluorescent nanomaterials; dual-emission fluorescence probe; mercury ions detection; IMPLICATION logic gate; SELECTIVE DETECTION; SENSOR; NANOPARTICLES; NANOCLUSTERS; IONS; HYBRID; ACID; FRET; HG2+;
D O I：
10.3390/mi12060713
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
It is urgent that a convenient and sensitive technique of detecting Hg2+ be developed because of its toxicity. Conventional fluorescence analysis works with a single fluorescence probe, and it often suffers from signal fluctuations which are influenced by external factors. In this research, a novel dual-emission probe assembled through utilizing CdTe quantum dots (QDs) and rhodamine B was designed to detect Hg2+ visually. Only the emission of CdTe QDs was quenched after adding Hg2+ in the dual-emission probe, which caused an intensity ratio change of the two different emission wavelengths and hence facilitated the visual detection of Hg2+. Compared to single emission QDs-based probe, a better linear relationship was shown between the variation of fluorescence intensity and the concentration of Hg2+, and the limit of detection (LOD) was found to be11.4 nM in the range of 0-2.6 mu M. Interestingly, the intensity of the probe containing Hg2+ could be recovered in presence of glutathione (GSH) due to the stronger binding affinity of Hg2+ towards GSH than that towards CdTe QDs. Based on this phenomenon, an IMPLICATION logic gate using Hg2+/GSH as inputs and the fluorescence signal of QDs as an output was constructed.
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页数：12
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