Nitrogen-doped carbon quantum dot material as well as preparation method and application thereof

A technology of carbon quantum dots and nitrogen doping, applied in biochemical equipment and methods, nanotechnology for materials and surface science, analytical materials, etc., can solve the complex preparation process and fluorescence performance of nitrogen-doped carbon quantum dot materials Poor, low quantum yield and other problems, to achieve the effect of improving quantum yield, reducing energy consumption, and simple process

Inactive Publication Date: 2017-12-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a nitrogen-doped carbon quantum dot material that overcomes the above-mentioned problems or at least partially solves the above-mentioned problems and its preparation method and application, so as to solve the problems of complex preparation process, low quantum yield and fluorescent performance of nitrogen-doped carbon quantum dot materials. poor technical problem

Method used

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  • Nitrogen-doped carbon quantum dot material as well as preparation method and application thereof
  • Nitrogen-doped carbon quantum dot material as well as preparation method and application thereof
  • Nitrogen-doped carbon quantum dot material as well as preparation method and application thereof

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Effect test

Embodiment 1

[0042] First, take 0.5g of polyethyleneimine (PEI) and dissolve it in 50mL of deionized water; then cut 12g of orange peel into 1×1cm 2 After adding the tablets to the solution, stir the mixed solution to a pressure bottle. Put the pressure bottle in the oil bath on the magnetic stirrer to increase the temperature, react at 140°C, stop heating after 3h. Take out the pressure bottle and let it cool to room temperature naturally.

[0043] Centrifuge the above solution to remove the precipitate at a speed of 13000r / min and a time of 15min. After centrifugation, the precipitate was discarded, the supernatant was placed in a beaker, the supernatant was sucked with a syringe, and filtered with a 220μm water-based microporous membrane, the filtrate was retained, and the membrane and the precipitate on it were discarded.

[0044] Put the filtrate into a dialysis bag and dialyzed with deionized water for 12 h at room temperature to obtain a nitrogen-doped carbon quantum dot solution. Tran...

Embodiment 2

[0053] First, take 0.5g of polyethyleneimine (PEI) and dissolve it in 50mL of deionized water, then cut 12g of orange peel into 1×1cm 2 After adding the tablets to the solution, stir the mixed solution to a pressure bottle. Put the pressure bottle in the oil bath on the magnetic stirrer to increase the temperature, react at 50°C, stop heating after 4h. Take out the pressure bottle and let it cool to room temperature naturally.

[0054] Centrifuge the above solution to remove the precipitate at a speed of 10000r / min and a time of 20min. After centrifugation, the precipitate was discarded, the supernatant was placed in a beaker, the solution was sucked with a syringe, and the solution was filtered with a 220μm water-based microporous filter membrane, the filtrate was retained, and the filter membrane and the sediment on it were discarded.

[0055] The filtrate was put into a dialysis bag and dialyzed with deionized water for 20 hours at room temperature to obtain a nitrogen-doped ca...

Embodiment 3

[0057] Take 1g of polyethyleneimine (PEI) and dissolve it in 50mL of deionized water, then cut 12g of orange peel into 1×1cm 2 After adding the tablets to the solution, stir the mixed solution to a pressure bottle. Place the pressure bottle in an oil bath on a magnetic stirrer to raise the temperature, react at 100°C, stop heating after 4 hours, take out the pressure bottle, and cool to room temperature naturally.

[0058] Centrifuge the above solution to remove the precipitate at a speed of 10000r / min and a time of 20min. After centrifugation, the precipitate was discarded, the supernatant was placed in a beaker, the supernatant was sucked with a syringe, and filtered with a 220μm water-based microporous membrane, the filtrate was retained, and the membrane and the precipitate on it were discarded.

[0059] The filtrate was put into a dialysis bag and dialyzed with deionized water for 20 hours at room temperature to obtain a nitrogen-doped carbon quantum dot solution. Transfer th...

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Abstract

The invention provides a nitrogen-doped carbon quantum dot material as well as a preparation method and application thereof. The nitrogen-doped carbon quantum dot material is obtained by taking fruit peel and polyethyleneimine as raw materials and through reaction, separation and purification as well as drying treatment. When the fruit peel and the polyethyleneimine are used as the raw materials for preparing the nitrogen-doped carbon quantum dot material, the nitrogen-doped carbon quantum dot material which is water-soluble liquid state can be obtained, and the nitrogen-doped carbon quantum dot material which is powdery and granular can also be obtained. Compared with a preparation method of a current nitrogen-doped carbon quantum dot material, according to the nitrogen-doped carbon quantum dot material as well as the preparation method and the application thereof, disclosed by the invention, the preparation technology is simpler, the quantum yield of an obtained product is higher, and reaction conditions are more moderate.

Description

Technical field [0001] The invention relates to a fluorescent nano material, and more specifically, to a nitrogen-doped carbon quantum dot material and a preparation method and application thereof. Background technique [0002] Carbon quantum dots are nanomaterials with a three-dimensional size of less than 10nm, which can emit bright light when exposed to light. Compared with metal quantum dots, it has no toxic effects, less harm to the environment, and low preparation cost. Carbon quantum dots have good application prospects due to their unique optical properties, good biocompatibility and low toxicity. [0003] Carbon quantum dots are carbon nano ions with fluorescent properties that were accidentally discovered when the carbon nanotubes prepared by the arc method were purified for the first time in 2004. While element doping can effectively increase the quantum yield of quantum dots, nitrogen-doped carbon quantum dots show excellent bioimaging and catalytic performance. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C12Q1/02B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/65G01N33/5005
Inventor 吴敏慈吉良黄勇
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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