Visible light excited fluorescent carbon quantum dots and preparation method thereof

A technology of carbon quantum dots and excitation of fluorescence, which is applied in the field of new functional materials, can solve the problems of rare fluorescence, etc., achieve the effect of short reaction time, simple and non-toxic raw materials, and expand the application range

Inactive Publication Date: 2018-09-04
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is that most of the current carbon quantum dots are excited under ultraviolet light to produce fluorescence, and those that are excited to produce fluorescence in the visible light range are relatively rare, and many carbon quantum dots excited under ultraviolet light require surface treatment to produce fluorescence. To solve the problem of emitting good fluorescence, provide a method for preparing carbon quantum dots that can be excited in the visible light range, so that the prepared carbon quantum dots can directly achieve good fluorescence under visible light excitation without any treatment

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  • Visible light excited fluorescent carbon quantum dots and preparation method thereof
  • Visible light excited fluorescent carbon quantum dots and preparation method thereof
  • Visible light excited fluorescent carbon quantum dots and preparation method thereof

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[0024] One aspect of the present invention provides a method for preparing carbon quantum dots that excite fluorescence with visible light, the preparation method comprising:

[0025] (1) dissolving citric acid and urea in water to obtain a precursor solution;

[0026] (2) Microwave reaction of the precursor solution to obtain a carbon quantum dot solution;

[0027] (3) Filtrating and drying the carbon quantum dot solution to obtain the carbon quantum dots with fluorescence excited by visible light.

[0028] According to the present invention, preferably, the preparation method further includes: (4) purifying the carbon quantum dots with fluorescence excited by visible light with an organic solvent to obtain the purified carbon quantum dots with fluorescence excited by visible light; the organic solvent is preferably At least one of ethanol, ethyl acetate and acetone.

[0029] The invention purifies the carbon quantum through the organic solvent, and then obtains the high-pu...

Embodiment 1

[0040] This embodiment provides a carbon quantum dot that emits fluorescence with visible light, and the specific preparation method is as follows:

[0041] (1) Add 0.3g of citric acid and 0.4g of urea into a 100ml beaker, then add 10ml of water, and ultrasonically dissolve it completely for 5 minutes to obtain a precursor solution;

[0042] (2) Put the beaker into a microwave oven and microwave for 4 minutes, and the carbon quantum dot solution is obtained after the reaction is completed;

[0043] (3) Centrifuge the carbon quantum dot solution at a centrifugal speed of 9000r / min for 10min, then filter it with a 0.22um polyethersulfone filter membrane to obtain an aqueous solution of carbon quantum dots, put 2 ml into a small centrifuge tube, and place it in Dry in an oven at 100° C. for 4 hours to remove moisture, and obtain the carbon quantum dots with fluorescence excited by visible light.

Embodiment 2

[0045] The difference between this embodiment and Example 1 is that the consumption of citric acid is changed to 0.6g, and other reactants, consumption and preparation method are all the same as in Example 1.

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Abstract

The invention discloses visible light excited fluorescent carbon quantum dots and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving citric acid and urea in water, thus obtaining a precursor solution; (2) carrying out microwave reaction on the precursor solution, thus obtaining a carbon quantum dot solution; (3) filtering and drying the carbon quantum dot solution, thus obtaining the visible light excited fluorescent carbon quantum dots. The excitation wavelength of the carbon quantum dots is visible wavelength, the stability is good, and the carbon quantum dots can be applied to aspect of bioimaging and detecting.

Description

technical field [0001] The invention belongs to the technical field of new functional materials, and more specifically relates to a carbon quantum dot with fluorescence excited by visible light and a preparation method thereof. Background technique [0002] Fluorescent probes have been used in various fields due to their excellent optical properties, among which carbon quantum dots and semiconductor quantum dots are the most prominent. However, compared with semiconductor quantum dots, carbon quantum dots do not contain heavy metal elements, have low toxicity, basically only contain C, H, O, N and other elements, have good biocompatibility, and have great potential in biological applications. In terms of raw materials, carbon quantum dots also have a huge advantage. Semiconductor quantum dots mainly come from several elements such as Te, Ge, and S. The source of raw materials is small, and the synthesis of carbon quantum dots can be obtained locally, such as honey, milk, tea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65
CPCC01B32/15C01P2002/70C01P2002/80C01P2002/82C09K11/65
Inventor 方华关金涛
Owner WUHAN POLYTECHNIC UNIVERSITY
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