Preparation method of silicon dioxide@ quantum dot composite nanoparticles

A technology of composite nanoparticles and silica, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of high raw material cost, large reaction energy consumption, complicated post-processing, etc. Simple to handle, the effect of increasing the load

Active Publication Date: 2015-07-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although silica quantum dot composite nanoparticles can be successfully synthesized, the microemulsion synthesis method has disadvantages such as high raw material cost, low output, and cumbersome post-processing, which is not conducive to batch and large-scale synthesis of products
For example, Chinese patent CN201210173571.6 adopts reverse micelles method to synthesize silica balls, and synthesizes quantum dots on the surface of silica balls under high-temperature oil bath conditions, but its disadvantage is that the synthesis of silica balls by reverse micelles requires at least 6 steps. The processing process, the synthesis process takes at least 2 days
The control of reaction conditions in high temperature oil bath is not easy to be stable, and the reaction consumes a lot of energy

Method used

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  • Preparation method of silicon dioxide@ quantum dot composite nanoparticles
  • Preparation method of silicon dioxide@ quantum dot composite nanoparticles
  • Preparation method of silicon dioxide@ quantum dot composite nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1. Preparation of mercapto-silica nanoparticles

[0036] Add ammonia water and water to absolute ethanol, add TEOS under stirring condition, the concentration of ammonia water in the final mixture is 2.6×10 －1 mol / L, the concentration of water is 4.1×10 －2 mol / L, the concentration of TEOS is 3.2×10 －2 mol / L, react at room temperature for 4 hours; then add MPS, the concentration of MPS in the mixture is 7.2×10 －6 mol / L, reacted at room temperature for 8 hours; the mixture was centrifuged, and the resulting precipitate was vacuum-dried to obtain mercapto-silica nanoparticles.

[0037] 2. Preparation of silica cadmium telluride composite nanoparticles

[0038] Disperse the mercapto-silicon dioxide nanoparticles synthesized in step 1 in an aqueous solution, add cadmium chloride and mercaptopropionic acid, adjust the pH value of the solution to 9.5 with sodium hydroxide, and then add sodium telluride hydride to form a precursor mixed solution , where the concentration of...

Embodiment 2

[0050] 1. The preparation of mercapto-silicon dioxide nanoparticles is the same as in Example 1.

[0051] 2. Synthesis of silica lead sulfide composite nanoparticles

[0052] The mercapto-silicon dioxide nanoparticles synthesized in step 1 are dispersed in an aqueous solution, lead chloride and N-acetyl-L-cysteine ​​are added, and the pH value of the solution is adjusted to 11 with potassium hydroxide, and then sodium sulfide is added, Prepare quantum dot precursor solution, wherein the concentration of mercapto-silica nanoparticles is 4.2×10 －3 mol / L, the concentration of lead chloride is 1.2×10 －5 mol / L, the concentration of sodium sulfide is 2.5×10 －6 mol / L, the concentration of N-acetyl-L-cysteine ​​is 3.0×10 －5 mol / L. The precursor solution is poured into a hydrothermal kettle, and reacted at 160°C for 1 hour; the mixed solution is centrifuged, and the obtained precipitate is vacuum-dried to obtain silica lead sulfide composite nanoparticles.

[0053] The method can ...

Embodiment 3

[0062] 1. Preparation of mercapto-silica nanoparticles

[0063] Add ammonia water and water to absolute ethanol, add TEOS under stirring condition, the concentration of ammonia water in the final mixture is 4.5mol / L, and the concentration of water is 3.6×10 －3 mol / L, the concentration of TEOS is 5.1×10 －1 mol / L, react at room temperature for 6 hours; then add MPS, the concentration of MPS in the mixed solution is 3.4×10 －5 mol / L, reacted at room temperature for 12 hours; the mixture was centrifuged, and the resulting precipitate was vacuum-dried to obtain mercapto-silica nanoparticles.

[0064] 2. Synthesis of silica zinc sulfide composite nanoparticles

[0065] Disperse the thiolated silica nanoparticles synthesized in step 1 in an aqueous solution, add zinc acetate and mercaptoacetic acid, adjust the pH value of the solution to 8.6 with sodium hydroxide, then add sodium sulfide to form a quantum dot precursor solution, wherein The concentration of thiolated silica nanopar...

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Abstract

The invention discloses a preparation method of silicon dioxide@ quantum dot composite nanoparticles. The method comprises steps as follows: thiolation silicon dioxide nanoparticles are prepared firstly, and the silicon dioxide@ quantum dot composite nanoparticles are prepared with a hydrothermal method. The preparation method is simple and easy to implement, high in yield and efficiency and beneficial to large-scale production. The prepared silicon dioxide@ quantum dot composite nanoparticles comprise silicon dioxide balls with particle sizes of 50-800 nm and quantum dot particles loaded on the silicon dioxide balls. The excellent fluorescence property of quantum dots is preserved, centrifugal separation of the particles is facilitated due to the fact that the quantum dots are loaded on silicon dioxide, the aftertreatment steps during use of the quantum dots are greatly optimized and simplified, and the preparation method has a broad application prospect.

Description

technical field [0001] The invention relates to the field of inorganic nanocomposite materials. More specifically, it relates to a preparation method of silica quantum dot composite nanoparticles. Background technique [0002] Quantum dot fluorescent material is a fluorescent probe with a wide and continuous distribution of excitation spectrum, narrow and symmetrical emission spectrum, adjustable emission color, high photochemical stability, and long fluorescence lifetime. Due to its excellent optical properties and The good application prospects in the field of biomedicine have attracted widespread attention. Quantum dots of various sizes, compositions, and structures have been synthesized and innovatively applied to biomedicine, especially in various fields of biochemical analysis. However, some problems have also been encountered in the practical application of quantum dots. One of the outstanding problems is that the size of quantum dots is very small (usually less tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88G01N21/64B82Y30/00B82Y20/00
Inventor 孟宪伟任湘菱唐芳琼
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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