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A fluorescent silicon quantum dot and its preparation method and application

A technology of silicon quantum dots and fluorescence, which is applied in the field of fluorescent silicon quantum dots and its preparation, can solve problems such as complicated methods and expensive equipment, and achieve the effects of good dispersion, clear fingerprints, and anti-oxidation

Active Publication Date: 2021-11-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this existing hydrothermal method needs to react under the protection of an inert gas (such as nitrogen), the method is too complicated, and the required equipment is also relatively expensive

Method used

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  • A fluorescent silicon quantum dot and its preparation method and application
  • A fluorescent silicon quantum dot and its preparation method and application
  • A fluorescent silicon quantum dot and its preparation method and application

Examples

Experimental program
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Embodiment 1

[0032] 1. The present embodiment provides a method for preparing fluorescent silicon quantum dots comprising the following steps:

[0033] (1) take by weighing 0.1159g (0.44mmol, the relative molecular weight that the present invention adopts 98% sodium citrate is 258.07) of sodium citrate and 0.3g (2.2mmol) of zinc chloride;

[0034] (2) Mix it into 4mL deionized water, stir well to make it completely dissolve;

[0035] (3) Slowly add 1 mL of N-[3-(trimethoxysilyl)propyl]ethylenediamine to the above solution, and stir well until it becomes clear to obtain a reaction solution;

[0036] (4) Transfer the reaction solution into a polytetrafluoroethylene reactor and heat at a temperature of 160° C. for 6 hours;

[0037] (5) Reactor is naturally cooled to room temperature to obtain a brownish-yellow solution;

[0038] (6) Take the yellow solution, slowly add 4 times the volume of ethanol, dry the precipitate at 60 degrees Celsius for 12 hours and grind to obtain fluorescent silic...

Embodiment 2

[0041] This embodiment provides a preparation method of fluorescent silicon quantum dots, using 0.058g sodium citrate and 0.3gZnCl 2 , 4 mL of deionized water, 1 mL of N-[3-(trimethoxysilyl) propyl] ethylenediamine, and the rest of the steps were the same as in Example 1.

Embodiment 3

[0043] This embodiment provides a preparation method of fluorescent silicon quantum dots, using 0.2318g sodium citrate and 0.3gZnCl 2 , 4 mL of deionized water, 1 mL of N-[3-(trimethoxysilyl) propyl] ethylenediamine, and the rest of the steps were the same as in Example 1.

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Abstract

The invention discloses a fluorescent silicon quantum dot and its preparation method and application. In the method, a reducing agent and a silicon source compound are used to synthesize water-soluble silicon quantum dots in a water phase through the action of Zn ions, and the reaction solution prepared from a hydrothermal reaction Fluorescent silicon quantum dot powder is precipitated in the medium; this method forms a film structure of polymer-like wrapped quantum dots by adding zinc ion hydrothermal reaction, thereby avoiding the further oxidation of silicon quantum dots to reduce the fluorescence rate, and then does not need to be in Protect under inert gas to prevent oxidation of the formed quantum dots, and the solid powder state can also fluoresce; the prepared fluorescent silicon quantum dot powder has very bright blue fluorescence at an excitation wavelength of 365nm, and has a high quantum yield , with a large number of amino groups on the surface, good water solubility and biocompatibility, and good fingerprint display performance on different substrate surfaces (glass, aluminum foil, weighing paper, wood).

Description

technical field [0001] The invention relates to the technical fields of nanomaterial preparation technology and biological analysis and detection, in particular to a fluorescent silicon quantum dot and its preparation method and application. Background technique [0002] Semiconductor quantum dots have better properties than conventional organic dyes, such as wide absorption wavelength range, narrow fluorescence spectrum, high fluorescence quantum yield, and better resistance to chemical bleaching. They have enormous potential applications in optoelectronic devices, sensing, and bioanalytical detection. However, the high toxicity of cadmium and lead QDs limits their practical applications. Therefore, there is an urgent need to develop a new type of phosphor material that is inexpensive and environmentally friendly to meet the needs of multifunctional applications. [0003] Silicon quantum dots, spherical silicon-based nanomaterials, have a small size of less than 5nm. Due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/021C09K11/59B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C01B33/021C09K11/59G01N21/6428G01N21/6486G01N2021/6432
Inventor 龚晓梁家豪
Owner WUHAN UNIV OF TECH