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Preparation and application of solid phosphorescent probe material based on Mn-doped ZnS quantum dot

A quantum dot and phosphorescence technology, which is applied in the preparation and application of solid phosphorescence probe materials based on Mn-doped ZnS quantum dots, can solve the problems of high cost, poor selectivity, complicated operation, etc., and achieves stable properties, excellent performance, Simple steps to prepare the effect

Active Publication Date: 2018-02-16
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of complex operation, high cost, and poor selectivity of the existing phenolic compound detection method, and to provide a preparation and application of a solid phosphorescent probe material based on Mn-doped ZnS quantum dots. The room temperature phosphorescence quenching effect of the compound on this solid phosphorescence probe material, simple, rapid and sensitive detection of phenolic compounds

Method used

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  • Preparation and application of solid phosphorescent probe material based on Mn-doped ZnS quantum dot
  • Preparation and application of solid phosphorescent probe material based on Mn-doped ZnS quantum dot
  • Preparation and application of solid phosphorescent probe material based on Mn-doped ZnS quantum dot

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Embodiment 1

[0032] A method for preparing a solid phosphorescent probe material of Mn-doped ZnS quantum dots in this embodiment, comprising the following steps:

[0033] (1) Preparation of Mn-doped ZnS quantum dots: N-acetyl-L-cysteine, Zn(Ac) 2 and Mn(Ac) 2 Mix according to the molar ratio of 3:1:0.04, adjust the pH value of the mixed solution to 11 with NaOH, and stir for 30 minutes at room temperature under the protection of nitrogen; under continuous stirring, add Zn(Ac) 2 Equimolar amount of Na 2 S aqueous solution, continue to react for 30min; then the reaction solution is heated to 50 ° C, aged in the air for 2h to obtain the crude product of Mn-doped ZnS quantum dots, and then purified and vacuum-dried to obtain Mn-doped ZnS quantum dot solid powder; The morphology, particle size and dispersion of the prepared N-acetyl-L-cysteine-modified Mn-doped ZnS quantum dots were observed and analyzed by transmission electron microscopy, as shown in figure 2 As shown, the quantum dots ar...

Embodiment 2

[0043] A method for preparing a solid phosphorescent probe material of Mn-doped ZnS quantum dots in this embodiment comprises the following steps:

[0044] (1) Preparation of Mn-doped ZnS quantum dots: L-cysteine, Zn(Ac) 2 and Mn(Ac) 2 Mix according to the molar ratio of 3:1:0.04, adjust the pH value of the mixed solution to 11 with NaOH, and stir for 20 minutes at room temperature under the protection of nitrogen; under continuous stirring, add Zn(Ac) 2 Equimolar amount of Na 2 S aqueous solution, continue to react for 20min; then heat the reaction solution to 50°C, and age in air for 2.5h to obtain the crude product of Mn-doped ZnS quantum dots, and then obtain Mn-doped ZnS quantum dot solids by purification and vacuum drying powder;

[0045] (2) Activate the surface of fumed silica: add 1 g of fumed silica and 20 ml of activating reagent to the flask, the activating reagent is prepared by 3-aminopropyltriethoxysilane and methanol at a volume ratio of 1:15 The mixed solu...

Embodiment 3

[0054] A method for preparing a solid phosphorescent probe material of Mn-doped ZnS quantum dots in this embodiment, comprising the following steps:

[0055] (1) Preparation of Mn-doped ZnS quantum dots: mercaptoacetic acid, Zn(Ac) 2 and Mn(Ac) 2 Mix according to the molar ratio of 3:1:0.04, adjust the pH value of the mixed solution to 11 with NaOH, and stir for 40 minutes at room temperature under the protection of nitrogen; under continuous stirring, add Zn(Ac) 2 Equimolar amount of Na 2 S aqueous solution, continue to react for 40min; then heat the reaction solution to 50°C, and age in air for 3h to obtain the crude product of Mn-doped ZnS quantum dots, and then obtain Mn-doped ZnS quantum dot solid powder by purification and vacuum drying ;

[0056] (2) Activate the surface of fumed silica: add 1 g of fumed silica and 20 ml of activating reagent to the flask, the activating reagent is prepared by 3-aminopropyltriethoxysilane and methanol at a volume ratio of 1:25 The m...

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Abstract

The invention relates to preparation and application of a solid phosphorescent probe material based on a Mn-doped ZnS quantum dot, and aims to solve the problems that a conventional phenol compound detection method is complicated in operation, high in cost and poor in selectivity. The technical scheme is that firstly, Mn is taken as a dopant, the Mn-doped ZnS quantum dot is prepared by the hydrothermal synthesis method, and then the quantum dot and tyrosinase are fixed on fumed silica to prepare the solid phosphorescent probe material based on the Mn-doped ZnS quantum dot. The solid phosphorescent probe material based on the Mn-doped ZnS quantum dot can be used for detecting such phenol compounds as pyrocatechol, phenol and nitrophenol and does not need complicated sample pretreatment during detection; a deoxidant or an inducer does not need to be added for production of room-temperature phosphorescence; a sample can be prevented from interference caused by such scattered light as autofluorescence, Raman and Rayleigh, so that the inspection sensitivity and the inspection selectivity are greatly improved; meanwhile, the solid probe material can be easily separated from a solution tobe detected, the room-temperature phosphorescence performance is recovered, and recovery and cyclic utilization of a phosphorescent probe can be realized.

Description

technical field [0001] The invention relates to the preparation and application of a solid phosphorescent probe material based on Mn-doped ZnS quantum dots. Background technique [0002] Fumed silica is a silica nanomaterial prepared by gas phase method, which is a fine, amorphous white powder. Fumed silica has the characteristics of small particle size, large specific surface area, high surface activity and high purity, especially for various organic molecules, including proteins and polymer materials, showing excellent adsorption capacity, so its application research has attracted widespread attention. s concern. It has been reported that proteins and enzymes are adsorbed to the surface of fumed silica. The adsorption is mainly through the non-covalent force formed by the groups on the surface of fumed silica and the carbonyl or amino groups in protein molecules. Since the enzyme has many advantages after immobilization, such as the ability to inhibit the autolysis of th...

Claims

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Application Information

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IPC IPC(8): C09K11/56B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/574G01N21/643G01N2021/6432
Inventor 董文娟王瑞平弓晓娟宋胜梅董川
Owner SHANXI UNIV
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