Preparation method of water-soluble fluorescent silicon quantum dot and application thereof in selective detection of p-nitrophenol

Abstract

The invention belongs to the field of fluorescent functional materials, and particularly relates to a water-soluble silicon quantum dot and a preparation method thereof and application thereof in highsensitivity and high selectivity detection of p-nitrophenol. The key points of the preparation method are as follows: 3-aminopropyltriethoxysilane is added into ultrapure water to react for 10 min under the condition of 85 DEG C and vigorous stirring, then a paracetamol solution is added, and continuous stirring is performed for reaction for 5 hours. The preparation method of the silicon quantumdot is simple and convenient, the reaction conditions are mild, the quantum yield is high, the water solubility is good, and the silicon quantum dot can be stored for a long time, and the excellent fluorescence performance can be maintained even under the conditions of different pH values and different ionic strengths. The silicon quantum dot emits 495 nm fluorescence under 398 nm fluorescence excitation, and the p-nitrophenol can specifically quench the fluorescence of the silicon quantum dot. The silicon quantum dot disclosed by the invention has a good application prospect in the aspects offast and 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 water-soluble fluorescent silicon quantum dots and its application in selective detection of p-nitrophenol. Background technique [0002] P-nitrophenol is stable and soluble in water, so it can exist in the natural environment for a long time, and because it is widely used in the preparation of pesticides, medicines, rubber, explosives and dyes and other chemicals, it is often contaminated by water and soil. Seriously affect people's physical and mental health. At present, the methods used to detect p-nitrophenol mainly include electrochemical methods, capillary electrophoresis, and chromatography. However, these methods more or less have some defects. The fluorescence analysis method provides a new idea for low-cost, high-efficiency and sensitive detection of p-nitrophenol. Contents of the invention [0003] The t...

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