A preparation method of water-soluble fluorescent silicon quantum dots and its application in the selective detection of p-nitrophenol

A technology for silicon quantum dots and p-nitrophenol, applied in the selective detection of p-nitrophenol, and the field of preparation of water-soluble fluorescent silicon quantum dots

Active Publication Date: 2022-05-27
HENAN NORMAL UNIV
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  • A preparation method of water-soluble fluorescent silicon quantum dots and its application in the selective detection of p-nitrophenol
  • A preparation method of water-soluble fluorescent silicon quantum dots and its application in the selective detection of p-nitrophenol
  • A preparation method of water-soluble fluorescent silicon quantum dots and its application in the selective detection of p-nitrophenol

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Embodiment

[0015] Synthesis of water-soluble cyan fluorescent silicon quantum dots

[0016] 5 mL of ultrapure water was added to the jacketed beaker, 1 mL of 3-aminopropyltriethoxysilane was added under vigorous stirring at 85°C, 2 mL of 50 mM paracetamol solution was added after 10 min, and the reaction was continued for 5 h. Water-soluble cyan fluorescent silicon quantum dots were obtained.

[0017] Fluorescence Properties and Characterization of Silicon Quantum Dots

[0018] figure 1 Influence of storage time for silicon quantum dots on their fluorescence properties. After being stored at 4°C for 70 days, the fluorescence intensity of silicon quantum dots still reached 98.6% of its initial fluorescence intensity, which proved that silicon quantum dots have good stability.

[0019] figure 2 is the effect of pH on its fluorescence intensity. In the investigated pH range, the fluorescence properties of silicon quantum dots did not change significantly.

[0020] image 3 is the e...

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Abstract

The invention belongs to the field of fluorescent functional materials, in particular to a water-soluble silicon quantum dot and its preparation method, and its application in the high-sensitivity and high-selectivity detection of p-nitrophenol. The key points of the technical scheme of the present invention are: 3-aminopropyltriethoxysilane is added to ultrapure water at 85°C and vigorously stirred for 10 minutes, then added with acetaminophen solution, and continuously stirred for 5 hours. The silicon quantum dot synthesis method of the invention is simple and convenient, has mild reaction conditions, high quantum yield, good water solubility, long-term storage, and can maintain excellent fluorescence performance even under different pH and different ion strength conditions. The silicon quantum dot emits 495nm fluorescence under excitation of 398nm fluorescence, and p-nitrophenol can specifically quench the fluorescence of the silicon quantum dot. The silicon quantum dot of the present invention shows good application prospects in the aspects of fast, efficient, high selectivity and high sensitivity detection of p-nitrophenol.

Description

technical field [0001] The invention belongs to the technical field of fluorescent functional materials, and in particular relates to a preparation method of a water-soluble fluorescent silicon quantum dot and its application in the selective detection of p-nitrophenol. Background technique [0002] p-Nitrophenol is stable and soluble in water, so it can exist for a long time in the natural environment, and because it is widely used in the preparation of chemicals such as pesticides, medicines, rubber, explosives and dyes, it is often polluted by water and soil. seriously affect people's physical and mental health. At present, the methods used for the detection of p-nitrophenol mainly include electrochemical methods, capillary electrophoresis, and chromatography. However, these methods have more or less some drawbacks. The fluorescence analysis method provides a new idea for low-cost, high-efficiency and sensitive detection of p-nitrophenol. SUMMARY OF THE INVENTION [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59C01B33/021B82Y20/00B82Y40/00G01N21/64
CPCC09K11/59C01B33/021B82Y20/00B82Y40/00G01N21/643G01N2021/6432
Inventor 叶存玲王远飞武莹王全坤王治科范顺利
Owner HENAN NORMAL UNIV
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