Metalmanganese doped carbon quantum dot having high fluorescence quantum yield and preparation method and application thereof

A technology of carbon quantum dots and metal manganese, which is applied to the field of metal manganese doped carbon quantum dots and their preparation, can solve the problems of low yield of metal doped carbon quantum dots, etc., and achieves low cost, less raw material consumption, and reaction speed. quick effect

Active Publication Date: 2017-06-27
SICHUAN PROVINCIAL PEOPLES HOSPITAL
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  • Abstract
  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings of the low yield of metal-doped carbon quantum dots in the prior art, and provide a metal-manganese-doped carbon quantum dot with high fluorescence quantum yield

Method used

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  • Metalmanganese doped carbon quantum dot having high fluorescence quantum yield and preparation method and application thereof
  • Metalmanganese doped carbon quantum dot having high fluorescence quantum yield and preparation method and application thereof
  • Metalmanganese doped carbon quantum dot having high fluorescence quantum yield and preparation method and application thereof

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Effect test

Embodiment 1

[0047] Embodiment 1 A kind of preparation method of metal manganese doped carbon quantum dots, comprises the following steps:

[0048] (a) Dissolve 0.735 g of sodium citrate in 25 mL of deionized water to obtain a 0.1 mol / L carbon source solution, then add 0.20 g of citric acid and 1.0 g of manganese carbonate in sequence, and stir for 5 min to obtain a precursor solution;

[0049] (b) Place the obtained precursor solution in a 50ml polytetrafluoroethylene-lined stainless steel autoclave, seal it and react at a temperature of 195°C for 1h, and cool it down to room temperature naturally to obtain a suspension;

[0050] (c) Filter the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 3kDa, collect the filtrate, and dry to obtain manganese-doped carbon quantum dots with high fluorescence yield.

[0051] see figure 1 , which is the transmission electron microscope image of the manganese-doped fluorescent carbon quantum dots prepared in th...

Embodiment 2

[0055] Embodiment 2 A preparation method of metal manganese doped carbon quantum dots, comprising the following steps:

[0056] (a) Dissolve 0.735 g of sodium citrate in 25 mL of deionized water to obtain a 0.1 mol / L carbon source solution, then add 0.20 g of citric acid and 1.0 g of manganese carbonate in sequence, and stir for 5 min to obtain a precursor solution;

[0057] (b) Place the obtained precursor solution in a 50ml polytetrafluoroethylene-lined stainless steel autoclave, seal it and react at a temperature of 195°C for 2h, and cool it down to room temperature naturally to obtain a suspension;

[0058] (c) Filtrate the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 3kDa, collect the filtrate, and dry to obtain manganese-doped carbon quantum dots with a high fluorescence yield.

[0059] The luminous intensity of the manganese-doped carbon quantum dots obtained in this example is 5.93×10 under the irradiation of 340nm light. ...

Embodiment 3

[0060] Embodiment 3 A preparation method of metal manganese doped carbon quantum dots, comprising the following steps:

[0061] (a) Dissolve 0.735 g of sodium citrate in 25 mL of deionized water to obtain a 0.1 mol / L carbon source solution, then add 0.20 g of citric acid and 1.0 g of manganese carbonate in sequence, and stir for 5 min to obtain a precursor solution;

[0062] (b) The obtained precursor solution was placed in a 50ml polytetrafluoroethylene-lined stainless steel autoclave, sealed and reacted at a temperature of 195°C for 6 h, and naturally cooled to room temperature to obtain a suspension;

[0063] (c) Filtrate the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 5 kDa, collect the filtrate, and dry to obtain a manganese-doped carbon quantum dot with a high fluorescence yield.

[0064] The luminous intensity of the manganese-doped carbon quantum dots obtained in this example is 1.0×10 under the irradiation of 440nm light...

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Abstract

The invention provides a metalmanganese doped carbon quantum dot having high fluorescence quantum yield and a preparation method and application thereof. The preparation method comprises the following steps that (1), a carbon source and a manganese source are dissolved in water to obtain a precursor solution; (2), the precursor solution reacts in a hydrothermal reaction kettle and then is cooled to reach room temperature to obtain a suspension; (3), the suspension is separated to obtain a solution; and (4), the solution is dialyzed and dried to obtain the metalmanganese doped carbon quantum dot. The metalmanganese doped carbon quantum dot can be prepared only through one-step reaction, the cost is low, the reaction speed is high, and few by-products and intermediate products are produced. In addition, the obtained carbon quantum dot has the advantage of high fluorescence quantum yield, meanwhile can be applied to detection of a trace amount of Hg<2+> in domestic drinking water and also has a wide application prospect in the aspects of biological detection, sewage treatment and the like.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a metal manganese doped carbon quantum dot with high fluorescence quantum yield and its preparation method and application. Background technique [0002] Since Xu et al. accidentally discovered nano-fluorescent substances in electrophoresis experiments and reported fluorescent carbon quantum dots for the first time in 2004, carbon quantum dots have aroused the interest of many researchers. It has the advantages of low cost, short synthesis time, fast response, low cytotoxicity, good biocompatibility, and small environmental hazards; thus it can be used as a substitute for semiconductor quantum dots. [0003] The better optical properties and fluorescence stability of carbon quantum dots have been successfully used in ion detection, sewage treatment, cell imaging and other fields; It has also achieved great research results in the degradation of organic dyes, fuel cells, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/06G01N21/64C02F1/00
CPCC02F1/00C02F2305/08C09K11/06C09K11/65G01N21/6428
Inventor 蔡璐璐闫峻峰龙恩武何林钟建
Owner SICHUAN PROVINCIAL PEOPLES HOSPITAL
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