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Preparation method of water-soluble nitrogen-phosphorus co-doped carbon quantum dots with concentration-dependent excitation and emission

A technology of emitting wavelengths and carbon quantum dots, which is applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve the problems of unfavorable continuous and large-scale production of fluorescent carbon quantum dots, low carbon quantum yield, and non-renewable energy. Achieve the effect of convenient preparation process, stable fluorescence and short reaction time

Active Publication Date: 2019-05-17
安徽寒锐新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method often requires strict experimental conditions and special energy sources, the cost is high, and the obtained carbon quantum yield is relatively low
Bottom-up synthesis method, that is, direct synthesis of fluorescent carbon quantum dots by pyrolysis or carbonization of suitable precursors, methods include: combustion method, hydrothermal carbonization method, ultrasonic method, etc., but these methods are often used Non-renewable energy and requires strict post-processing, so it is not conducive to continuous and large-scale production of fluorescent carbon quantum dots

Method used

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  • Preparation method of water-soluble nitrogen-phosphorus co-doped carbon quantum dots with concentration-dependent excitation and emission
  • Preparation method of water-soluble nitrogen-phosphorus co-doped carbon quantum dots with concentration-dependent excitation and emission
  • Preparation method of water-soluble nitrogen-phosphorus co-doped carbon quantum dots with concentration-dependent excitation and emission

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Embodiment 1

[0036] A method for preparing water-soluble nitrogen-phosphorus co-doped carbon quantum dots whose excitation and emission wavelengths depend on concentration, comprising the following steps:

[0037] S1, the preparation of sucrose precursor solution;

[0038] S2. Mixing the sucrose precursor solution and concentrated phosphoric acid at a volume ratio of 1:3 to obtain a first mixed solution;

[0039] S3. Stir the first mixed solution obtained in S2 evenly, place it in an incubator, and heat it to obtain a brown solution and cool it to room temperature;

[0040] S4. Put the cooled brown solution in S3 in an ice-water bath and mix the brown solution and ethylenediamine at a volume ratio of 5:1, and add ultrapure water to dilute to obtain a second mixed solution, and filter the second mixed solution , to obtain the filtrate;

[0041] S5, dialyzing the filtrate to obtain a dialysate;

[0042] S6. Evaporating the dialysate under constant temperature conditions to obtain water-so...

Embodiment 2

[0049] A method for preparing water-soluble nitrogen-phosphorus co-doped carbon quantum dots whose excitation and emission wavelengths depend on concentration, comprising the following steps:

[0050] S1, the preparation of sucrose precursor solution;

[0051] S2. Mixing the sucrose precursor solution and concentrated phosphoric acid at a volume ratio of 2:3 to obtain the first mixed solution;

[0052] S3. Stir the first mixed solution obtained in S2 evenly, place it in an incubator, and heat it to obtain a brown solution and cool it to room temperature;

[0053] S4. Put the cooled brown solution in S3 in an ice-water bath and mix the brown solution and ethylenediamine at a volume ratio of 5:1, and add ultrapure water to dilute to obtain a second mixed solution, and filter the second mixed solution , to obtain the filtrate;

[0054] S5, dialyzing the filtrate to obtain a dialysate;

[0055] S6. Evaporating the dialysate under constant temperature conditions to obtain water-so...

Embodiment 3

[0062] A method for preparing water-soluble nitrogen-phosphorus co-doped carbon quantum dots whose excitation and emission wavelengths depend on concentration, comprising the following steps:

[0063] S1, the preparation of sucrose precursor solution;

[0064] S2. Mixing the sucrose precursor solution and concentrated phosphoric acid at a volume ratio of 3:3 to obtain the first mixed solution;

[0065] S3. Stir the first mixed solution obtained in S2 evenly, place it in an incubator, and heat it to obtain a brown solution and cool it to room temperature;

[0066] S4. Put the cooled brown solution in S3 in an ice-water bath and mix the brown solution and ethylenediamine at a volume ratio of 5:2, and add ultrapure water to dilute to obtain a second mixed solution, and filter the second mixed solution , to obtain the filtrate;

[0067] S5, dialyzing the filtrate to obtain a dialysate;

[0068] S6. Evaporating the dialysate under constant temperature conditions to obtain water-...

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Abstract

The invention provides a preparation method of a water-soluble nitrogen-phosphorus co-doped carbon quantum dot capable of exciting emission wavelength dependence concentration. The preparation method comprises the following steps: preparing a cane sugar precursor solution; mixing the cane sugar precursor solution and strong phosphoric acid according to the volume ratio of 1 to (5 to 3) to obtain a first mixed solution; heating the prepared first mixed solution to obtain a brown solution; placing the brown solution in ice-water bath, and mixing the brown solution with ethylenediamine according to the volume ratio of 5 to (1 to 5) to obtain a second mixed solution, filtering the second mixed solution to obtain a filtrate; dialyzing the filtrate to obtain dialysate; evaporating the dialysate to obtain the water-soluble nitrogen-phosphorus co-doped carbon quantum dot. The preparation method of the water-soluble nitrogen-phosphorus co-doped carbon quantum dot has the advantages of abundant and low-cost carbon sources, simple preparation process, freeness from pollution and toxicity in a whole preparation process, environmental-friendliness, capability of performing large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of fluorescent material preparation, and specifically relates to a method for preparing water-soluble nitrogen-phosphorus co-doped carbon quantum dots whose excitation and emission wavelengths depend on the concentration. Background technique [0002] In recent years, fluorescent carbon nanomaterials have attracted extensive research by researchers because of their good optical properties and low cytotoxicity. It has good photostability and no toxic side ions, is suitable for long-term detection and tracing experiments, and has broad application prospects in biomarkers and analysis and detection. Carbon quantum dots (CQDs) exhibit excellent properties such as hydrophilicity, low cytotoxicity, chemical and photostability, etc., which have attracted extensive attention and applications in the fields of chemistry, biomedicine, sensing and optoelectronics. [0003] There are currently two main methods for prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/70B82Y40/00
CPCB82Y40/00C09K11/0883C09K11/70
Inventor 黄珊肖琦杨二利刘义
Owner 安徽寒锐新材料有限公司
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