Method for preparing yellow or green silicon quantum dots

A technology of silicon quantum dots and green, which is applied in the field of preparing yellow or green silicon quantum dots, can solve the problems of difficult preparation of yellow or green silicon quantum dots, high requirements for equipment and low quantum yield, and achieve good water solubility and easy operation. Environmentally friendly, cheap and easy-to-get raw materials

Active Publication Date: 2019-01-11
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for preparing yellow or green silicon quantum dots, wherein the overall flow process of the preparation method, and the conditions and parameters used in key synthesis reactions ( Including the type and proportion of reaction raw materials, etc.) to improve, compared with the prior art, it can effectively solve the problem of difficult preparation of yellow or green silicon quantum dots. Most of the methods in the prior art prepare blue silicon quantum dots, only A small number of methods for preparing yellow or green silicon quantum dots, but since these prior art methods for preparing yellow or green silicon quantum dots still have the problems of low quantum yield, c

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  • Method for preparing yellow or green silicon quantum dots
  • Method for preparing yellow or green silicon quantum dots
  • Method for preparing yellow or green silicon quantum dots

Examples

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Embodiment 1

[0046] (1) Dissolve 0.0068g of sodium citrate, 0.0011g of catechol and 0.206g of N-aminoethyl-γ-aminopropyltrimethoxysilane in 20ml of ultrapure water, and stir for 30min under the protection of nitrogen .

[0047] (2) Transfer the mixed solution in step (1) to a hydrothermal reaction kettle, and place it in an electric constant temperature blast drying oven for hydrothermal reaction at 130°C for 4h (before heating, you can use nitrogen or argon or other protective The gas is discharged from the air in the hydrothermal reaction kettle), and a yellow silicon quantum dot solution is obtained.

[0048] (3) After mixing the solution in step (2) with acetonitrile at a volume ratio of 1:4, centrifuge at 8000 rpm for 10 min, remove the supernatant, and freeze-dry to obtain solid silicon quantum dots.

[0049] Rhodamine 6G dissolved in ethanol was used as a reference (quantum yield = 95%). The quantum yield of silicon quantum dots was calculated by comparing the ratio of fluorescenc...

Embodiment 2

[0054] (1) Dissolve 0.0068g of sodium citrate, 0.0011g of catechol and 0.206g of N-aminoethyl-γ-aminopropyltrimethoxysilane in 20ml of ultrapure water, and stir for 30min under the protection of nitrogen .

[0055] (2) Transfer the mixed solution in step (1) to a hydrothermal reaction kettle, and place it in an electric constant temperature blast drying oven for hydrothermal reaction at 150°C for 5h (before heating, you can use nitrogen or argon or other protective The gas is discharged from the air in the hydrothermal reaction kettle), and the green silicon quantum dot solution is obtained.

[0056] (3) After mixing the solution in step (2) with acetonitrile at a volume ratio of 1:4, centrifuge at 8000 rpm for 10 min, remove the supernatant, and freeze-dry to obtain solid silicon quantum dots. image 3 It is the fluorescence spectrum and the ultraviolet-visible light spectrum of the green quantum dot synthesized in embodiment 2. It can be seen from the figure that at the op...

Embodiment 3

[0058] (1) Dissolve 0.0068g of thiourea, 0.000275g of resorcinol and 1.03g of 3-aminopropyltrimethoxysilane in 10ml of ultrapure water, and stir for 5min under the protection of nitrogen.

[0059] (2) Transfer the mixed solution in step (1) to a hydrothermal reaction kettle, and place it in a Weibo hydrothermal reaction apparatus for hydrothermal reaction at 130°C for 2h (before heating, you can use nitrogen or argon, etc. to protect The gas is discharged from the air in the hydrothermal reaction kettle), and a yellow silicon quantum dot solution is obtained.

[0060] (3) After mixing the solution in step (2) with dimethyl sulfoxide at a volume ratio of 1:2, centrifuge at 10,000 rpm for 10 min, remove the supernatant, and freeze-dry to obtain solid silicon quantum dots. Figure 4 It is the fluorescence spectrum of the yellow quantum dots synthesized in Example 3. It can be seen from the figure that at the optimal excitation wavelength of 420nm, the emission peak of the silico...

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Abstract

The invention discloses a method for preparing yellow or green silicon quantum dots. The method comprises the following steps: (1) dispersing a silicon source, a first reducing agent and a second reducing agent into ultrapure water; then stirring under the protection of protective gas to obtain a mixed solution; (2) heating the mixed solution obtained by step (1) in a reaction container and reacting to obtain a silicon quantum dot solution; and (3) mixing the silicon quantum dot solution obtained by step (2) and an organic reagent and then centrifuging and drying to obtain solid silicon quantum dots. Based on a synergistic effect of the first reducing agent and the second reducing agent, the yellow or green silicon quantum dots with the high quantum yield are synthesized in one step through a simple water-phase method and the silicon quantum dots with different emission wavelengths can be synthesized through adjusting the temperature of heating reaction; and the quantum yield of the green silicon quantum dots is 38.31 percent and the quantum yield of the yellow silicon quantum dots is 29.36 percent.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and more specifically relates to a method for preparing yellow or green silicon quantum dots. Background technique [0002] Silicon quantum dots are a new type of silicon nanomaterials. Compared with traditional semiconductor quantum dots and organic dyes, they have the advantages of low toxicity, good biocompatibility, adjustable luminous range, and easy functionalization. Optoelectronics, catalysis and sensing have broad application prospects. There are various methods for preparing silicon quantum dots, but most methods synthesize silicon quantum dots with blue fluorescence. Due to the poor penetration of short-wavelength (blue) silicon quantum dots to tissues, the optical imaging of deep tissues in the body is limited. In addition, almost all biological tissues will produce autofluorescence for short-wavelength visible light, which interferes with the imaging effect, while long-w...

Claims

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Application Information

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IPC IPC(8): C01B33/021C09K11/59B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B33/021C09K11/59
Inventor 赵丹张芷夏郝建
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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