A nitrogen-doped fluorescent carbon quantum dot and its preparation method

A technology of carbon quantum dots and nitrogen doping, applied in fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of complex processing and high cost, and achieve good biocompatibility, high functional can low effect

Active Publication Date: 2021-07-13
DALIAN POLYTECHNIC UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

The invention overcomes the disadvantages of expensive raw material cost and complicated follow-up treatment, fully considers economic and environmental protection, adopts natural non-toxic, cheap and easy to obtain and biodegradable carboxymethyl cellulose as the precursor, and ethylenediamine as the nitrogen source doping agent; using a one-step hydrothermal method that is environmentally friendly, simple to operate, and requires little experimental equipment to prepare nitrogen-doped fluorescent carbon quantum dots with high fluorescence intensity and low toxicity, and has been successfully applied to Fe 3+ detection

Method used

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  • A nitrogen-doped fluorescent carbon quantum dot and its preparation method
  • A nitrogen-doped fluorescent carbon quantum dot and its preparation method
  • A nitrogen-doped fluorescent carbon quantum dot and its preparation method

Examples

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Effect test

Embodiment 1

[0045] Weigh 2g of carboxymethylcellulose (molecular weight: 90000, purchased from Aladdin Company), fully dissolve in 40mL of ultrapure water under magnetic stirring at room temperature, add 1.5g of ethylenediamine to the carboxymethylcellulose solution medium (the mass ratio of ethylenediamine to carboxymethyl cellulose is 0.75), after the above two raw materials are mixed evenly, add ultrapure water to make up to 50mL to obtain a transparent light yellow solution; then transfer the above solution Put it into a PPL-lined stainless steel high-pressure reaction kettle, seal it, place it in an oil bath, and heat it for 36 hours at a controlled reaction temperature of 220°C; after the reaction is completed, after the reaction kettle is cooled to room temperature, a dark brown reaction solution is obtained , ultrasonically disperse for 20min under the condition that the power of the ultrasonic cell pulverizer is 100W, ultrasonically disperse for 2s and stop for 3s, centrifuge for ...

Embodiment 2

[0052] Referring to Example 1, the difference from Example 1 is that the mass ratio of ethylenediamine to carboxymethylcellulose is 0.15. The fluorescence quantum yield of nitrogen-doped carbon quantum dots prepared under this condition is 13.13%.

Embodiment 3

[0054] Referring to Example 1, the difference from Example 1 is that the mass ratio of ethylenediamine to carboxymethylcellulose is 0.30. The fluorescence quantum yield of nitrogen-doped carbon quantum dots prepared under this condition is 14.72%.

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Abstract

The invention belongs to the technical field of nanometer material preparation and metal ion detection, and in particular relates to a nitrogen-doped fluorescent carbon quantum dot and a preparation method thereof. A method for preparing nitrogen-doped fluorescent carbon quantum dots, comprising configuring a mixed solution of carboxymethyl cellulose and ethylenediamine; placing the mixed solution in a high-pressure reactor for hydrothermal reaction to obtain a reaction solution; Ultrasound, centrifugation, and filtration treatment to obtain a filtrate; dialysis treatment is performed on the filtrate with ultrapure water, and the solid product obtained by dialysis is freeze-dried to powder to obtain the obtained product. The method has simple preparation process, green environmental protection, low cost, simple equipment and is suitable for large-scale production, and the prepared carbon quantum dots have good water solubility, stable fluorescence performance, uniform particle size, non-toxic and harmless, biocompatibility, etc. Excellent performance to expand the application field of carbon quantum dots.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation and metal ion detection, and in particular relates to a nitrogen-doped fluorescent carbon quantum dot and a preparation method thereof. Background technique [0002] In recent years, carbon quantum dots have attracted great attention from researchers due to their advantages such as low toxicity, good biocompatibility, stable optical properties, and easy surface functionalization. and other fields are considered to be the most promising new carbon nanomaterials. At present, the preparation methods of carbon quantum dots usually include electrochemical synthesis method, chemical oxidation method, combustion method, hydrothermal synthesis method, template method, microwave synthesis method, etc. Among them, compared with other synthesis methods, hydrothermal synthesis method is more expensive than other synthetic methods. The steps are simple, the reaction conditions are relat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65G01N21/643G01N2021/6432
Inventor 郭延柱刘真真王兴韩颖周景辉
Owner DALIAN POLYTECHNIC UNIVERSITY
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