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Relatively long emission wavelength fluorescent carbon quantum dot and preparation method thereof

A carbon quantum dot and emission wavelength technology, which is applied in the field of longer emission wavelength fluorescent carbon quantum dots and the preparation thereof, can solve the problems of concentration of the fluorescence emission wavelength in the blue light region, cumbersome preparation method, etc., and achieves good water solubility, simple process, mild conditions

Inactive Publication Date: 2018-12-28
CHINA PHARM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the cumbersome preparation methods of most of the current carbon quantum dots and the concentration of fluorescence emission wavelengths in the blue light region, the present invention provides a fluorescent carbon quantum dot with a longer emission wavelength and its preparation method

Method used

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  • Relatively long emission wavelength fluorescent carbon quantum dot and preparation method thereof
  • Relatively long emission wavelength fluorescent carbon quantum dot and preparation method thereof
  • Relatively long emission wavelength fluorescent carbon quantum dot and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] Accurately measure 30ml of absolute ethanol and 30ml of deionized water and mix evenly, add 1.5g of L-ascorbic acid to it, and stir magnetically for 15min until the L-ascorbic acid is completely dissolved to obtain a clear and transparent solution; Put the reaction kettle in a fluoroethylene reaction kettle at 90°C for 6 hours, take out the reaction kettle and let it cool down to room temperature naturally; then filter the resulting reaction solution with a 0.22 μm filter membrane, collect the filtrate and dialyze it in a dialysis bag with a molecular weight cut-off of 1000 Da for 24 hours. The fluorescent carbon quantum dot solution is obtained.

[0024] The prepared fluorescent carbon quantum dots were analyzed by transmission electron microscope, infrared spectrum and fluorescence spectrum.

[0025] figure 1 The transmission electron microscope image of the fluorescent carbon quantum dots prepared for this example shows that the carbon quantum dots are spherical par...

Embodiment 2

[0029] Accurately measure 30ml of absolute ethanol and 30ml of deionized water and mix them evenly, add 1.5g of L-ascorbic acid thereinto, magnetically stir for 15min until the L-ascorbic acid is completely dissolved, then add 0.01ml of ethylenediamine (EDA) to it, and mix evenly to obtain Clarify the transparent solution; transfer the mixed solution to a polytetrafluoroethylene reactor with a volume of 100ml, put it in an oven at 90°C for 6h, take out the reactor and cool it to room temperature naturally; then filter the obtained reaction solution with a 0.22μm filter membrane, The collected filtrate was placed in a dialysis bag with a molecular weight cut-off of 1000 Da and dialyzed for 24 hours to obtain a fluorescent carbon quantum dot solution.

Embodiment 3

[0031] Accurately measure 30ml of absolute ethanol and 30ml of deionized water and mix evenly, add 1.5g of L-ascorbic acid to it, stir for 15min until L-ascorbic acid is completely dissolved, then add 0.01ml of polyoxyethylene diamine (PEG-diamine) , mix evenly to obtain a clear and transparent solution; transfer the mixed solution to a polytetrafluoroethylene reactor with a volume of 100ml, put it in an oven at 90°C for 6 hours, take out the reactor and cool it to room temperature naturally; then use a 0.22μm Filter through a filter membrane, collect the filtrate and dialyze in a dialysis bag with a molecular weight cut-off of 1000 Da for 24 hours to obtain a fluorescent carbon quantum dot solution.

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Abstract

The invention discloses a relatively long emission wavelength fluorescent carbon quantum dot and a preparation method thereof. According to the method, L-ascorbic acid is used as a carbon source, anda certain proportion of passivating agents and solvents is added and uniformly mixed with L-ascorbic acid to obtain a clear transparent solution; the mixed liquid is placed in a reaction kettle for areaction for a few hours at high temperature and then is naturally cooled to room temperature; the reaction liquid is subjected to separation and purification treatment, and a fluorescent carbon quantum dot solution is obtained. The preparation method provided by the invention has the advantages of simple process, mild condition, low production cost and environmental protection; the prepared carbon quantum dots have a relatively long fluorescence emission wavelength, can achieve controllable emission wavelength, good water solubility, diversity of surface properties, uniform distribution of particle size and other characteristics by adding different types of passivating agents, and can be widely used in cell imaging, biomarker, biochemical sensing and other fields.

Description

technical field [0001] The invention belongs to the field of carbon nanotechnology, and in particular relates to a fluorescent carbon quantum dot with a longer emission wavelength and a preparation method thereof. Background technique [0002] Carbon quantum dots are spherical nanoparticles with a size less than 10nm that can be dispersed in water or other solvents. As a new type of fluorescent carbon nanomaterial, carbon quantum dots have the characteristics of stable fluorescence performance, high biocompatibility, good water solubility, and low toxicity compared with traditional semiconductor quantum dots, and can be widely used in cell imaging , biomarkers, drug delivery, analysis and detection, photoelectric conversion and other fields. [0003] The preparation methods of carbon quantum dots can be classified into two categories: "top-down" and "bottom-up". The "top-down" method is to process large-scale carbon materials into nano-sized carbon quantum dots through var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65
CPCC09K11/65
Inventor 奚俊婷阮秀琴仝宇晴
Owner CHINA PHARM UNIV
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