Silicon quantum dot aqueous phase preparation method

A technology for the preparation of silicon quantum dots and water phase, which is applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve problems such as low quantum yield, and achieve the effects of simple synthesis operation, easy availability of raw materials, and cheap raw materials

Inactive Publication Date: 2016-09-28
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved in the present invention is that th

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  • Silicon quantum dot aqueous phase preparation method
  • Silicon quantum dot aqueous phase preparation method
  • Silicon quantum dot aqueous phase preparation method

Examples

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Example Embodiment

[0034] Example 1

[0035] The method for synthesizing water-soluble silicon quantum dots by hydrothermal method using 3-aminopropyltrimethoxysilane as a silicon source, and its concrete steps are as follows:

[0036] (1) Dissolve citric acid and sodium borohydride in deionized water under the protection of nitrogen, then add 3-aminopropyltrimethoxysilane as silicon source, and control the molar ratio of silicon source: citric acid: sodium borohydride = 1:0.2:0.2, wherein the concentration of 3-aminopropyltrimethoxysilane in water is 44mmol / L, the concentration of citric acid in water is 8.8mmol / L, and the concentration of sodium borohydride in water is 8.8mmol / L .

[0037] (2) The mixed solution was transferred to a high-pressure reactor and heated to 140° C. and reacted for 3.5 h to obtain a silicon quantum dot solution.

[0038] (3) Mix the prepared silicon quantum dot solution with methanol at a volume ratio of 1:3, centrifuge at 8000 r / min for 10 min, remove the supernat...

Example Embodiment

[0051] Example 2

[0052] Using 3-aminopropyltrimethoxysilane as silicon source, the method for synthesizing water-soluble silicon quantum dots by hydrothermal method, its preparation method is the same as that of Example 1, and the concentration of 3-aminopropyltrimethoxysilane in water is 44mmol / L , the difference lies in the concentration of reducing agents citric acid and sodium borohydride. The molar ratio of 3-aminopropyltrimethoxysilane:citric acid:sodium borohydride was 1:0.2:0.2~1. After measurement, the fluorescence intensity of silicon quantum dots prepared under different ratios is shown in image 3 .

[0053] Under each ratio, the quantum yield is shown in the following table:

[0054] Molar ratio of 3-aminopropyltrimethoxysilane:citric acid:sodium borohydride

[0055] It is determined that the quantum dots prepared in this example have good pH stability, thermal stability, salt resistance and resistance to metal ion interference.

[0056] As can be ...

Example Embodiment

[0057] Example 3

[0058] The method for synthesizing water-soluble silicon quantum dots by hydrothermal method with 3-aminopropyltriethoxysilane as silicon source, and its concrete steps are as follows:

[0059] (1) Dissolve 3-aminopropyltriethoxysilane in deionized water under the protection of argon, the concentration of 3-aminopropyltrimethoxysilane in water is 44mmol / L, and then add sodium borohydride and Sodium sulfite, control the molar ratio of silicon source: sodium borohydride: sodium sulfite = 1:1:0.5.

[0060] (2) Transfer the stirred and mixed solution to an autoclave and heat to 170° C. and react for 2 hours to obtain a silicon quantum dot solution.

[0061] (3) The obtained silicon quantum dot solution is uniformly mixed with ethanol according to the ratio of quantum dots:ethanol=1:2. Centrifuge at 8000 r / min for 15 min, remove the supernatant, and vacuum dry the obtained precipitate to obtain solid silicon quantum dots.

[0062] The quantum yield of this exa...

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Abstract

The invention discloses a water-phase preparation method of silicon quantum dots, comprising the following steps: (1) taking a reducing agent and a silane coupling agent and dissolving them in water under the protection of an inert gas, and the molar ratio of the silane coupling agent to the reducing agent is: 1:0.2~10; (2) Transfer the mixed solution obtained in step (1) into a high-pressure reactor and heat it to 140-220°C, and the silicon quantum dot solution can be obtained after the reaction; or the mixed solution obtained in step (1) The solution is transferred to a microwave reactor and heated to 140-220°C, and the silicon quantum dot solution can be obtained after the reaction; (3) the silicon quantum dot solution obtained in step (2) is mixed with an organic solvent, centrifuged, and the supernatant is removed. dry to obtain solid silicon quantum dots; wherein the reducing agent is citric acid, sodium sulfite, sodium borohydride, sodium citrate, ascorbic acid, urea, thiourea, hydrazine hydrate, L-cysteine, bovine serum albumin or Mixture of two or more in denatured bovine serum albumin.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of nanomaterials, and specifically discloses a preparation method for water-phase synthesis of water-soluble fluorescent silicon quantum dots using a silane coupling agent as a silicon source and utilizing the synergistic effect of a reducing agent by using a hydrothermal method or a microwave method method. Background technique [0002] Quantum dots are quasi-zero-dimensional nanomaterials composed of II-VI or III-V elements with a diameter of 1 to 10 nm. Silicon is an indirect bandgap semiconductor. Traditional silicon nanomaterials emit very weak light, which limits their application in devices. However, when their size is continuously reduced, the quantum size effect enhances the fluorescence intensity of silicon quantum dots, exhibiting photophysical properties similar to those of direct bandgap semiconductors. In addition, compared with traditional II-VI or III-V quantum dots, ...

Claims

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Application Information

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IPC IPC(8): C09K11/59B82Y20/00B82Y40/00
CPCC09K11/59B82Y20/00B82Y40/00
Inventor 赵丹马诗瑶郝健
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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