Preparation method of amorphous boron-doped graphite phase carbon nitride quantum dot, quantum dot prepared by same and application of quantum dot

A graphite-phase carbon nitride and amorphous technology, applied in the field of fluorescent materials, can solve the problems of dependent behavior, self-quenching excitation wavelength, low fluorescence quantum yield, etc., and achieve the promotion of exciton formation, high selectivity and sensitivity , Optimize the effect of optical performance

Active Publication Date: 2021-06-04
HUNAN UNIV
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Problems solved by technology

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the low fluorescence quantum yield, self-quenching and excitation wavelength-d

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  • Preparation method of amorphous boron-doped graphite phase carbon nitride quantum dot, quantum dot prepared by same and application of quantum dot
  • Preparation method of amorphous boron-doped graphite phase carbon nitride quantum dot, quantum dot prepared by same and application of quantum dot
  • Preparation method of amorphous boron-doped graphite phase carbon nitride quantum dot, quantum dot prepared by same and application of quantum dot

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[0037] Example 1

[0038] A method for preparing an amorphous boron doped graphite-phase nitride carbon quantum point (B-CNQDS), including the steps of:

[0039] (1) The sources of citric acid are carbon sources, boric acid is a boron source, urea is a nitrogen source, and the appropriate amount of deionized water is uniform, and the mixture is obtained;

[0040] (2) The mixture was placed in a high pressure reaction kettle, warmed to 180 ° C for 2 h;

[0041] (3) Naturally cooled to normal temperature, resulting in the reaction solution, mixing the reaction solution to 4 times volume of deionized water;

[0042] (4) Collect the supernatant by the solution obtained by the step (3) by the filtration.

[0043] (5) Dilute the supernatant to the amorphous B-CNQDS suspension.

[0044] Among them, the molar ratio of citric acid, boric acid, and urea is 1: 6: 6, in step (1).

[0045] Among them, the rate of warming in step (2) is 5 ° C / min.

[0046] Wherein, the time of the ultrasonic ...

Example Embodiment

[0049] Example 2

[0050] A method for preparing an amorphous boron doped graphite-phase nitride carbon quantum point (B-CNQDS), including the steps of:

[0051] (1) The sources of citric acid are carbon sources, boric acid is a boron source, urea is a nitrogen source, and the appropriate amount of deionized water is uniform, and the mixture is obtained;

[0052] (2) The mixture was placed in a high pressure reaction kettle, and the temperature was raised to 180 ° C for 1.5 h;

[0053] (3) Naturally cooled to normal temperature, resulting in the reaction solution, mixing the reaction solution to 4 times volume of deionized water;

[0054] (4) Collect the supernatant by the solution obtained by the step (3) by the filtration.

[0055] (5) Dilute the supernatant to the amorphous B-CNQDS suspension.

[0056] Among them, citric acid, boric acid, and urea in step (1) are 1: 5: 5.

[0057] Among them, the rate of temperature above step (2) is 4 ° C / min.

[0058] Wherein, the time in s...

Example Embodiment

[0061] Example 3

[0062] A method for preparing an amorphous boron doped graphite-phase nitride carbon quantum point (B-CNQDS), including the steps of:

[0063] (1) The sources of citric acid are carbon sources, boric acid is a boron source, urea is a nitrogen source, and the appropriate amount of deionized water is uniform, and the mixture is obtained;

[0064] (2) Put the mixture into the high pressure reaction kettle, temperature rise to 180 ° C.

[0065] (3) Naturally cooled to normal temperature, resulting in the reaction solution, mixing the reaction solution to 4 times volume of deionized water;

[0066] (4) Collect the supernatant by the solution obtained by the step (3) by the filtration.

[0067] (5) Dilute the supernatant to the amorphous B-CNQDS suspension.

[0068] Among them, citric acid, boric acid, and urea in step (1) are 1: 7: 7.

[0069] Among them, the rate of warming in step (2) is 6 ° C / min.

[0070] Wherein, the time in step (3) has a time of 7 h.

[0071...

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Abstract

The invention provides a preparation method of amorphous boron-doped graphite phase carbon nitride quantum dots, and belongs to the field of fluorescent materials. The method includes the following steps: (1) taking citric acid as a carbon source, boric acid as a boron source and urea as a nitrogen source, adding a proper amount of deionized water, and uniformly grinding the components to obtain a mixture; (2) putting the mixture into a high-pressure reaction kettle, heating the reaction kettle to 180 DEG C, and reacting for 1.5-2.5 hours; (3) naturally cooling the product to normal temperature to obtain a reaction solution, mixing the reaction solution with deionized water, and carrying out ultrasonic treatment; (4) filtering the solution obtained in the step (3) through a filter membrane, and collecting supernate; and (5) diluting the supernate, so as to obtain the amorphous B-CNQDs suspension. The invention also provides the amorphous boron-doped graphite phase carbon nitride quantum dot prepared by the method and application of the amorphous boron-doped graphite phase carbon nitride quantum dot in fluorescence imaging and heavy metal ion detection. The amorphous B-CNQDs have the advantages of high fluorescence quantum yield, no excitation wavelength dependence, strong fluorescence stability, and very high selectivity and sensitivity to Fe < 2 + > and Cd < 2 + > in a trace (ppb) range.

Description

technical field [0001] The invention relates to the field of fluorescent materials, in particular to a method for preparing amorphous boron-doped graphite-phase carbon nitride quantum dots, the prepared quantum dots and applications. Background technique [0002] Graphite phase carbon nitride quantum dots (CNQDs), as an attractive photoluminescence (PL) material, has great potential in the fields of fluorescence imaging and detection of heavy metal ions. However, three factors that seriously hinder the commercial application of CNQDs are: low fluorescence quantum yield, self-quenching, and excitation wavelength-dependent behavior. Contents of the invention [0003] Therefore, the technical problem to be solved by the present invention is to overcome the low fluorescence quantum yield, self-quenching and excitation wavelength-dependent behavior defects of CNQDs in the prior art, thereby providing an amorphous boron-doped graphite phase carbon nitride quantum Preparation me...

Claims

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Application Information

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IPC IPC(8): C01B21/082C09K11/65B82Y30/00B82Y40/00
CPCC01B21/0605C09K11/65B82Y30/00B82Y40/00C01P2004/04C01P2002/72C01P2002/82C01P2002/84
Inventor 黄桂芳李波胡望宇黄维清
Owner HUNAN UNIV
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