A kind of preparation method of amidated carbon quantum dot

A technology of amidated carbon and quantum dots, which is applied in the field of preparation of amidated carbon quantum dots, can solve problems such as low quantum yield, and achieve the effect of single raw material, simple hydrothermal synthesis method, and high quantum yield

Active Publication Date: 2022-01-28
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fluorescence is the most prominent feature of carbon quantum dots, but pure carbon quantum dots often have a very low quantum yield, so it is necessary to introduce heteroatoms, such as nitrogen, sulfur, etc., to increase their quantum yield

Method used

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  • A kind of preparation method of amidated carbon quantum dot
  • A kind of preparation method of amidated carbon quantum dot
  • A kind of preparation method of amidated carbon quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of amidated carbon quantum dots, the specific steps are as follows:

[0029] (1) Dissolving histidine in sodium hydroxide solution and ultrasonically treating it for 10 min at an ultrasonic power of 20 kHz to obtain mixed solution A; wherein the concentration of sodium hydroxide solution is 10 mg / mL, and the concentration of histidine and sodium hydroxide solution The solid-to-liquid ratio g:mL is 1:10;

[0030] (2) Put the mixed solution A in step (1) under the condition of 200° C. for hydrothermal reaction for 12 hours, cool it down to room temperature naturally, and filter out large particles to obtain filtrate B; wherein the pore size of the filtered filter membrane is 0.22 μm;

[0031] (3) The filtrate B of step (2) is centrifuged, and the supernatant is taken; wherein the rotating speed of the centrifugation is 10000r / min, and the time of the centrifugation is 20min;

[0032] (4) The supernatant of step (3) is dialyzed through the dialysis me...

Embodiment 2

[0048] A preparation method of amidated carbon quantum dots, the specific steps are as follows:

[0049] (1) dissolving histidine in sodium hydroxide solution and ultrasonically treating 15 min at an ultrasonic power of 15 kHz to obtain mixed solution A; wherein the concentration of sodium hydroxide solution is 10 mg / mL, the concentration of histidine and sodium hydroxide solution The solid-to-liquid ratio g:mL is 1:5;

[0050] (2) Put the mixed solution A in step (1) under the condition of 180°C for hydrothermal reaction for 15 hours, naturally cool to room temperature, and filter to obtain filtrate B; wherein the filtered filter membrane has a pore size of 0.35 μm;

[0051] (3) The filtrate B of step (2) is centrifuged, and the supernatant is taken; wherein the rotating speed of the centrifugation is 8000r / min, and the time of the centrifugation is 30min;

[0052] (4) The supernatant of step (3) is dialyzed through a dialysis membrane to obtain an amidated carbon quantum do...

Embodiment 3

[0067] A preparation method of amidated carbon quantum dots, the specific steps are as follows:

[0068] (1) Dissolving histidine in sodium hydroxide solution and ultrasonically treating 5 min at an ultrasonic power of 30 kHz to obtain mixed solution A; wherein the concentration of sodium hydroxide solution is 8 mg / mL, the concentration of histidine and sodium hydroxide solution The solid-to-liquid ratio g:mL is 1:15;

[0069] (2) Put the mixed solution A in step (1) at a temperature of 220° C. for a hydrothermal reaction for 10 h, cool it down to room temperature naturally, and filter to obtain a filtrate B; wherein the filtered filter membrane has a pore size of 0.25 μm;

[0070] (3) The filtrate B of step (2) is centrifuged, and the supernatant is taken; wherein the rotating speed of the centrifugation is 12000r / min, and the time of the centrifugation is 10min;

[0071] (4) The supernatant of step (3) is dialyzed through the dialysis membrane to obtain the amidated carbon ...

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Abstract

The invention discloses a preparation method and application of aminated carbon quantum dots, belonging to the technical field of carbon quantum dots. In the present invention, histidine is dissolved in sodium hydroxide solution and ultrasonically treated for 5-15 minutes to obtain mixed solution A; the mixed solution A is placed at a temperature of 180-220°C for hydrothermal reaction for 10-15 hours, and naturally cooled to room temperature , and filtrate to obtain filtrate B; centrifuge the filtrate B, and take the supernatant; dialyze the supernatant through a dialysis membrane to obtain an amidated carbon quantum dot solution, and store it in a refrigerator at a temperature of 0-4°C. The present invention uses histidine as a carbon source and a nitrogen source, and can synthesize aminated carbon quantum dots with a high fluorescence quantum yield through a one-step hydrothermal method. The method is simple and green, and the obtained aminated carbon quantum dots have a higher quantum yield. efficiency; the present invention applies the synthesized amidated carbon quantum dots to the simultaneous detection of electrochemistry and fluorescence. The amidated carbon quantum dots have dual stability, making the detection results more accurate and reliable.

Description

technical field [0001] The invention relates to a preparation method of aminated carbon quantum dots, belonging to the technical field of carbon quantum dots. Background technique [0002] Carbon quantum dots are a kind of zero-dimensional carbon nanomaterials, which are loved by many researchers because of their advantages such as non-toxicity, harmlessness to the environment, good biocompatibility, and low price. Fluorescent properties are the most prominent feature of carbon quantum dots, but pure carbon quantum dots often have a very low quantum yield, so it is necessary to introduce heteroatoms, such as nitrogen and sulfur, to improve their quantum yield. As a new type of nanomaterial, carbon quantum dots have broad application prospects in the fields of catalysis, drug delivery, and sensing. [0003] Carbon quantum dots are increasingly used in sensing, including electrochemical detection and fluorescence detection. In fluorescence detection, carbon quantum dots are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y30/00B82Y20/00G01N21/64G01N27/26
CPCC09K11/65G01N21/6428G01N27/26B82Y20/00B82Y30/00G01N2021/6432
Inventor 屈庆周鑫李蕾
Owner YUNNAN UNIV
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