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A kind of preparation method of selenium doped carbon quantum dot

A carbon quantum dot and selenium doping technology is applied in the field of preparation of selenium-doped carbon quantum dots, which can solve the problems of high biological toxicity of organic fluorescent dyes, complicated preparation process, difficulty in large-scale production, etc. High quantum yield, easy-to-prepare effect

Active Publication Date: 2016-08-03
中科悦达(上海)材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot be ignored that organic fluorescent dyes have a series of disadvantages such as high biological toxicity, difficult preparation, and poor stability.
RatiometricandSelectiveFluorescentSensorforZn published by Inorg.Chem. in 2012 2+ asan "Off-On-Off" Switch and LogicGate, prepared an organic fluorescent dye with a crown ether structure, which has a good response to zinc ions and is relatively stable, but the organic fluorescent dye has high biological toxicity
Multivalued Logic with a Tristable Fluorescent Switch published by J.Phys.Chem.C in 2009 prepared a series of switch-type organic fluorescent dyes with stable performance and low biological toxicity. However, the preparation process of such dyes is complicated, the yield is low, and it is difficult to produce on a large scale
At the same time, as a new type of fluorescent material, carbon quantum dots have received extensive attention due to their excellent properties such as small particle size, good biocompatibility, simple preparation, stable performance, and low cost. However, there is still no carbon-based quantum dots. Report on the Application of Quantum Dots in Redox Fluorescent Switches

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  • A kind of preparation method of selenium doped carbon quantum dot
  • A kind of preparation method of selenium doped carbon quantum dot
  • A kind of preparation method of selenium doped carbon quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] combine figure 1 and figure 2 , first, step S10: providing carbon oxide quantum dot powder;

[0045] Specifically, including:

[0046] Step S11: Provide 5.00g of carbon black powder (particle size 30-50nm);

[0047] Step S12: Add the carbon black powder into a mixture of 50mL concentrated nitric acid (concentration: 67wt%) and 120mL concentrated sulfuric acid (concentration: 98wt%), mechanically stir at 5°C for 60min at a stirring rate of 1200r / min, to form the first a mixed liquid;

[0048] Step S13: Slowly add 60g of NaClO to the first mixed liquid 3 In order to generate an oxidation reaction, control the reaction temperature of the oxidation reaction to 0-5°C, and react for 12 hours to form a second mixed liquid;

[0049] Step S14: Cool the second mixed liquid to room temperature, add 200 mL of distilled water to dilute to form a third mixed liquid, and filter it with a 10 nm porous alumina filter;

[0050] Step S15: adding ammonia water to the filtered third...

Embodiment 2

[0062] Change the selenium-containing dopant in Example 1 into 0.10g diphenyl diselenide, and other conditions remain unchanged, and the selenium-doped carbon quantum dots with an emission wavelength of 580nm can be obtained, and this material can produce strong yellow-green fluorescence with a quantum yield of 0.44. Via the same fluorescence detection means as in Example 1, it can be seen that the fluorescence of the quantum dot aqueous solution can be oxidized and quenched by hydroxyl radicals, and restored by vitamin C reduction, and the detection limit for hydroxyl radicals is 6×10 -14 M, the limit of detection for vitamin C is 1×10 -13 M. The response time is 0.05s, and it is stable to all common metal ions.

Embodiment 3

[0064] Change the selenium-containing dopant in Example 1 to 0.10gNaHSe, and other conditions remain unchanged, and it is possible to obtain selenium-doped carbon quantum dots with an emission wavelength of 594nm. This material can produce strong yellow-green fluorescence under ultraviolet light irradiation. The quantum yield was 0.62. Via the same fluorescence detection means as in Example 1, it can be seen that the fluorescence of the quantum dot aqueous solution can be oxidized and quenched by superoxide radicals, and restored by reduction of reduced glutathione, and the detection limit for superoxide radicals is 3 ×10 -14 M, the limit of detection for reduced glutathione is 2×10 -14 M. The response time is 0.1s, and it is stable to all common metal ions.

[0065] Such as image 3 Shown is the result of the repeatability performance test of the selenium-doped carbon quantum dot fluorescent switch in Example 3. It can be seen from the figure that the performance of the ...

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Abstract

The invention relates to a preparation method of selenium-doped carbon quantum dots. The preparation method comprises the following steps of (1) preparing carbon oxide quantum dot powder, (2) dispersing the carbon oxide quantum dot powder in a solvent to obtain a carbon oxide quantum dot solution, (3) adding a selenium-containing dopant into the carbon oxide quantum dot solution and carrying out a solvothermal reaction process at a temperature of 50-500DEG C for 0.5-180h to obtain the selenium-doped carbon quantum dots. The selenium-doped carbon quantum dots have the characteristics of high quantum yield, simple structure, easy preparation, low cost, mass production, high stability, low biotoxicity, fast response and high sensitivity.

Description

technical field [0001] The invention belongs to the field of biological analysis and detection, in particular to a preparation method of selenium-doped carbon quantum dots. Background technique [0002] Fluorescence detection technology has important application prospects in a series of aspects such as pollutant detection and biological fluorescence imaging due to its characteristics of sensitivity, rapidity and low cost. Among many fluorescent materials, switching fluorescent materials have attracted extensive attention because of their reusable advantages. Among them, as one of the most important fluorescent materials, switchable organic fluorescent dyes have been extensively and deeply studied in fluorescence detection technology. However, it cannot be ignored that organic fluorescent dyes have a series of disadvantages such as high biological toxicity, difficult preparation, and poor stability. RatiometricandSelectiveFluorescentSensorforZn published by Inorg.Chem. in 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88G01N21/64
Inventor 丁古巧杨思维谢晓明江绵恒
Owner 中科悦达(上海)材料科技有限公司
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