Method for preparing high-yield fluorescent silicon quantum dots by virtue of hydrothermal method or microwave method

A technology of silicon quantum dots and microwave method, applied in the field of preparation of nanomaterials, can solve the problems of inability to directly apply biological systems, unfavorable for large-scale production in factories, complicated operations, etc., and achieves high yield, good stability, acid resistance, Combining simple effects

Inactive Publication Date: 2016-12-07
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing method to prepare silicon quantum dots has complicated oper

Method used

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  • Method for preparing high-yield fluorescent silicon quantum dots by virtue of hydrothermal method or microwave method
  • Method for preparing high-yield fluorescent silicon quantum dots by virtue of hydrothermal method or microwave method
  • Method for preparing high-yield fluorescent silicon quantum dots by virtue of hydrothermal method or microwave method

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Embodiment 1

[0053] The method for synthesizing water-soluble silicon quantum dots by hydrothermal method with ureapropyltriethoxysilane as silicon source, its specific steps are as follows:

[0054] (1) Dissolve sodium citrate in deionized water under the protection of nitrogen, and then add ureapropyltriethoxysilane to control silicon source: sodium citrate molar ratio = 1:0.2, among which, ureapropyltriethoxysilane The concentration of oxysilane in water is 44mmol / L, and the concentration of sodium citrate in water is 8.8mmol / L. And adjust its pH=7 (NaOH, KOH, ammonia water, etc. can be used to adjust the pH), and then transfer the uniformly mixed solution into a 500ml high-pressure reactor and heat it to 200°C for 2.5 hours to obtain a large amount of quantum dot solution.

[0055] (2) Put the obtained silicon quantum dot solution in a spray dryer to obtain solid silicon quantum dots.

[0056] After detection and calculation, the silicon quantum dots of this embodiment have a quantum ...

Embodiment 2

[0058] The method for synthesizing water-soluble silicon quantum dots by hydrothermal method with ureapropyltriethoxysilane as silicon source, its specific steps are as follows:

[0059] (1) Dissolve sodium citrate in deionized water under the protection of argon, and then add ureapropyltriethoxysilane to control the silicon source: sodium citrate molar ratio = 1:0.5, among which, ureapropyltriethoxysilane The concentration of ethoxysilane in water is 44mmol / L, and the concentration of sodium citrate in water is 22mmol / L. And adjust its pH=8, transfer the stirred and mixed solution into an autoclave and heat it to 200° C., and react for 3 hours to obtain a quantum dot solution.

[0060] (2) Mix the obtained silicon quantum dot solution with ethanol evenly at the ratio of quantum dots:ethanol=1:2. Centrifuge at 8000r / min for 5min, remove the supernatant, and dry the resulting precipitate in a vacuum to obtain solid silicon quantum dots.

[0061] The ultraviolet absorption spe...

Embodiment 3

[0075] The method for synthesizing water-soluble silicon quantum dots by microwave method with ureapropyltrimethoxysilane as silicon source, its specific steps are as follows:

[0076] (1) Dissolve sodium citrate in deionized water under the protection of argon, and then add ureapropyltrimethoxysilane, silicon source: sodium citrate molar ratio = 1:0.4, among them, ureapropyltrimethoxysilane The concentration of silane in water is 60mmol / L, and the concentration of sodium citrate in water is 24mmol / L. And adjust its pH=10, then transfer the uniformly mixed solution into a microwave reactor and heat it to 180°C, and react for 15 minutes to obtain a silicon quantum dot solution.

[0077] (2) Mix the obtained silicon quantum dot solution with acetonitrile evenly at the ratio of quantum dots:acetonitrile=1:4. Centrifuge at 5000 r / min for 15 min, remove the supernatant, and freeze-dry the obtained precipitate to obtain solid silicon quantum dots.

[0078] Measure the XPS of the s...

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Abstract

The invention belongs to the technical field of preparation methods of nano materials and particularly discloses a method for preparing high-yield fluorescent silicon quantum dots by virtue of a hydrothermal method or a microwave method. According to the method, a silicon source is urea propyl trimethoxy silane or urea propyl triethoxy silane; the raw material cost is low, the raw material source is rich, the operation steps are simple, the yield of the prepared quantum dots is high, and the large-scale production and the environmental protection are easily realized; the prepared quantum dots have excellent optical properties and good biocompatibility, and the particle size distribution is uniform; and the silicon quantum dots can be widely applied to the aspects of optoelectronics, solar energy conversion, biosensors, fluorescence probes and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of nanomaterials, and specifically discloses a method for synthesizing water-soluble fluorescent silicon by using ureapropyltrimethoxysilane and ureapropyltriethoxysilane as silicon sources by hydrothermal method or microwave method. quantum dots. Background technique [0002] The synthesis and performance research of silicon quantum dots has always been one of the hotspots of people's research. This is because silicon is an indirect band gap semiconductor, and traditional silicon nanomaterials emit very weak light, which limits their application in devices. However, when its size is continuously reduced, the quantum size effect makes the optical transition of silicon quantum dots close to the permissive process, and its fluorescence intensity is enhanced, showing photophysical properties similar to those of direct bandgap semiconductors. In addition, compared with traditional Ⅱ-Ⅵ and...

Claims

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Application Information

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IPC IPC(8): C09K11/59B82Y40/00
CPCC09K11/59B82Y40/00
Inventor 赵丹马诗瑶郝健
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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