1. Dual-Emission Fluorescence Probe Based on CdTe Quantum Dots and Rhodamine B for Visual Detection of Mercury and Its Logic Gate Behavior
- Author
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Xinxiang Pan, Gao Yuefeng, Sai Xu, Yu Kezhen, and Zhijian Liu
- Subjects
Materials science ,02 engineering and technology ,CdTe quantum dots ,01 natural sciences ,Signal ,Article ,chemistry.chemical_compound ,IMPLICATION logic gate ,dual-emission fluorescence probe ,TJ1-1570 ,Rhodamine B ,Mechanical engineering and machinery ,Electrical and Electronic Engineering ,Detection limit ,business.industry ,Mechanical Engineering ,010401 analytical chemistry ,021001 nanoscience & nanotechnology ,Fluorescence ,Cadmium telluride photovoltaics ,0104 chemical sciences ,Wavelength ,fluorescent nanomaterials ,chemistry ,Control and Systems Engineering ,Quantum dot ,Logic gate ,mercury ions detection ,Optoelectronics ,0210 nano-technology ,business - Abstract
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 μM. 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.
- Published
- 2021
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