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Method for preparing fluorescent tungsten oxide quantum dot through solvothermal process, prepared fluorescent tungsten oxide quantum dot and application of fluorescent tungsten oxide quantum dot

A technology of tungsten oxide quantum dots and solvothermal method, which is applied in the field of nanomaterials, can solve the problems of expensive experimental equipment, time-consuming preparation process, and poor performance of tungsten oxide quantum dots, achieving less time-consuming, good dispersion, and easy operation. simple effect

Active Publication Date: 2017-12-01
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] There are a series of problems related to the preparation method of tungsten oxide quantum dots, such as: the preparation process is time-consuming, a large amount of organic solvent is used, expensive experimental equipment, and the obtained tungsten oxide quantum dots have poor performance, etc.

Method used

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  • Method for preparing fluorescent tungsten oxide quantum dot through solvothermal process, prepared fluorescent tungsten oxide quantum dot and application of fluorescent tungsten oxide quantum dot
  • Method for preparing fluorescent tungsten oxide quantum dot through solvothermal process, prepared fluorescent tungsten oxide quantum dot and application of fluorescent tungsten oxide quantum dot
  • Method for preparing fluorescent tungsten oxide quantum dot through solvothermal process, prepared fluorescent tungsten oxide quantum dot and application of fluorescent tungsten oxide quantum dot

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Weigh 45mg of tungsten disulfide powder, disperse in 45mL of absolute ethanol, add 0.8mL of hydrogen peroxide to the dispersion, and stir evenly with a glass rod. The prepared mixed solution was transferred to a 100mL reactor, sealed and reacted in an oven with a temperature of 180°C and a reaction time of 20h, and cooled naturally to room temperature. The reacted solution was vacuum filtered through a filter membrane with a pore size of 0.22 μm to remove unreacted residual particles, and the filtrate was collected. Put the filtrate into a dialysis bag with a molecular weight cut off of 1000D and dialyze for 2 to 3 days. The obtained dialysate was frozen and then freeze-dried at a temperature of -20° C. and an air pressure of 20 Pa to obtain tungsten oxide quantum dot powder.

[0038] figure 1 It is a transmission electron microscope picture of the tungsten oxide quantum dot obtained in Example 1. It can be clearly seen that the size distribution of the nanoscale tung...

Embodiment 2

[0040] Weigh 30mg of tungsten disulfide powder, disperse in 45mL of absolute ethanol, add 0.1mL of hydrogen peroxide to the dispersion, and stir evenly with a glass rod. The prepared mixed solution was transferred to a 100mL reactor, sealed and reacted in an oven at a temperature of 60°C and a reaction time of 4h, and cooled naturally to room temperature. The reacted solution was vacuum filtered through a filter membrane with a pore size of 0.22 μm to remove unreacted residual particles, and the filtrate was collected. Put the filtrate into a dialysis bag with a molecular weight cut off of 1000D and dialyze for 2 to 3 days. The obtained dialysate was frozen and then freeze-dried under the conditions of temperature at -20° C. and air pressure at 20 Pa to obtain tungsten oxide quantum dot powder.

Embodiment 3

[0042]Weigh 30mg of tungsten disulfide powder, disperse in 15mL of absolute ethanol, add 0.2mL of hydrogen peroxide to the dispersion, and stir evenly with a glass rod. The prepared mixed solution was transferred to a 100mL reactor, sealed and reacted in an oven at a temperature of 90°C for a reaction time of 8 hours, and cooled naturally to room temperature. The reacted solution was vacuum filtered through a filter membrane with a pore size of 0.22 μm to remove unreacted residual particles, and the filtrate was collected. Put the filtrate into a dialysis bag with a molecular weight cut off of 1000D and dialyze for 2 to 3 days. The obtained dialysate was frozen and then freeze-dried under the conditions of temperature at -20° C. and air pressure at 20 Pa to obtain tungsten oxide quantum dot powder.

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Abstract

The invention discloses a method for preparing a fluorescent tungsten oxide quantum dot through a solvothermal process, the prepared fluorescent tungsten oxide quantum dot and application of the fluorescent tungsten oxide quantum dot, belonging to the technical field of nanometer materials. The method comprises the following concrete steps: dispersing tungsten disulfide powder in an alcohol solvent to obtain a dispersion of tungsten disulfide; adding hydrogen peroxide into the dispersion, and carrying out uniform mixing under stirring to obtain a mixed solution; transferring the obtained mixed solution into a reaction vessel, sealing the reaction vessel and then carrying out a high-temperature reaction; subjecting a reaction solution obtained in the previous to vacuum pumping filtration, and collecting a filtrate for dialysis; and freezing collected dialysis fluid and then carrying out vacuum freeze-drying to obtain tungsten oxide quantum dot powder. The preparation method provided by the invention is simple, green and environment-friendly, uses easily available raw materials and has high controllability. The prepared tungsten oxide quantum dot has the advantages of uniform size, easy dispersion and good fluorescence stability, and the fluorescence emission spectrum of the tungsten oxide quantum dot is dependent on excitation wavelength, so the tungsten oxide quantum dot is extensively applicable to biological imaging, biomarkers, light-emitting sensing element and other fields.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a method for preparing fluorescent tungsten oxide quantum dots by a solvothermal method, the prepared fluorescent tungsten oxide quantum dots and applications thereof. Background technique [0002] With resource consumption and energy shortage, people are increasingly exploring new materials. The discovery of graphene has opened the door to the study of two-dimensional nanomaterials. Various layered two-dimensional nanomaterials rely on their unique optical and electrical properties. It has good application prospects in the fields of catalysis, biological imaging, solar energy conversion and various sensors, and has become one of the research hotspots of new materials today. [0003] As an n-type semiconductor material, tungsten oxide has unique properties such as photoluminescence, electroluminescence, thermoluminescence and catalysis. Quantum dots, that is, s...

Claims

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Application Information

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IPC IPC(8): C01G41/02C09K11/68G01N21/64
CPCC01G41/02C01P2002/72C01P2004/04C09K11/681G01N21/6428
Inventor 胡超凡刘应亮战岩雷炳富庄健乐张浩然
Owner SOUTH CHINA AGRI UNIV
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