Preparation method of stable, high-brightness and bright-colored purple CQD

A high-brightness and stable technology, applied in the field of preparation of purple CQDs, can solve the problems of non-compliance with green environmental protection, poor product stability, complex preparation conditions, etc., and achieve the effects of easy storage, not easy to return to moisture, and simple preparation conditions.

Pending Publication Date: 2021-09-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Document 1 (Tunable photoluminescence across the entire visible spectrum from carbon dots excited by white light[J].Angew Chem Int Ed Engl,2015,54(10):2970-2974.) uses CA and sodium borohydride as raw materials, polyethylene Imine is used as a solvent, and CQDs with a wavelength of 400nm are prepared at a temperature of 180°C. Organic solvents need to be introduced during the preparation process, which does not conform to the concept of green environmental protection; Document 2 (Rational Design of Multi-Color-Emissive Carbon Dots in a Single Reaction System by Hydrothermal[J].Advanced Science,2020,2001453.) discloses a purple CQD with a wavelength of 413nm prepared by using CA and OPD as raw materials and hydrothermally reacting at 240°C for 6h. Deionized water is used as a solvent without introducing organic solvents, which is green and environmentally friendly, but the preparation conditions are complicated, the product stability is poor, the brightness is low, and the color is not bright

Method used

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  • Preparation method of stable, high-brightness and bright-colored purple CQD
  • Preparation method of stable, high-brightness and bright-colored purple CQD
  • Preparation method of stable, high-brightness and bright-colored purple CQD

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Experimental program
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Effect test

Embodiment 1

[0037] A stable, high-brightness and bright-coloured purple CQD preparation method, the specific steps are as follows:

[0038] (1) After mixing CA, OPD, MPD and water to obtain the reaction solution, use sodium hydroxide to adjust the pH value of the reaction solution to 5; wherein, the molar ratio of OPD, CA and MPD is 1.5:1:1.5, and OPD and water The ratio of 324mg: 20mL;

[0039] (2) the reaction solution that the pH that step (1) obtains is 5 is joined in the polytetrafluoroethylene reactor, then the polytetrafluoroethylene reactor is put into the electric blast drying box, under normal pressure (100KPa), React at a temperature of 100°C for 8 hours, then cool the reaction liquid after the reaction to 23°C, filter it with a 0.22 μm filter membrane, and finally freeze the filtrate obtained by liquid nitrogen and freeze it in a freeze dryer. After vacuum drying for 2 d, purple CQD powders were obtained, that is, stable, high-brightness and colorful purple CQDs.

[0040] Th...

Embodiment 2

[0044] A stable, high-brightness and bright-coloured purple CQD preparation method, the specific steps are as follows:

[0045] (1) After mixing CA, OPD, MPD and water to obtain the reaction solution, use sodium hydroxide to adjust the pH value of the reaction solution to 6; wherein, the mol ratio of OPD, CA and MPD is 1.5:1.2:0.3, and OPD and water The ratio is 324mg:24mL;

[0046] (2) the reaction solution that the pH that step (1) obtains is 6 is joined in the polytetrafluoroethylene reactor, then the polytetrafluoroethylene reactor is put into the electric blast drying box, under normal pressure (100KPa), React at a temperature of 110°C for 7 hours, then cool the reaction liquid after the reaction to 24°C, filter it with a 0.22 μm filter membrane, and finally freeze the filtrate obtained by liquid nitrogen and freeze it in a freeze dryer After vacuum drying for 3 d, purple CQD powders were obtained, that is, stable, high-brightness and colorful purple CQDs.

[0047] The ...

Embodiment 3

[0049] A stable, high-brightness and bright-coloured purple CQD preparation method, the specific steps are as follows:

[0050] (1) After mixing CA, OPD, MPD and water to obtain the reaction solution, use sodium hydroxide to adjust the pH value of the reaction solution to 7; wherein, the mol ratio of OPD, CA and MPD is 1.5:1.5:0.5, and OPD and water The ratio of 324mg: 26mL;

[0051] (2) the reaction solution that the pH obtained in step (1) is 7 is added in the polytetrafluoroethylene reactor, then the polytetrafluoroethylene reactor is put into an electric blast drying box, under normal pressure (100KPa), React at a temperature of 120°C for 6 hours, then cool the reaction liquid after the reaction to 25°C, filter it with a 0.22 μm filter membrane, and finally freeze the filtrate obtained by liquid nitrogen and freeze it in a freeze dryer. After vacuum drying for 4 d, purple CQD powders were obtained, that is, stable, high-brightness and bright-colored purple CQDs.

[0052]...

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Abstract

The invention relates to a preparation method of stable, high-brightness and bright-colored purple CQD. The preparation method comprises the following steps: mixing CA, OPD, MPD and water to obtain a reaction solution, adjusting the pH value of the reaction solution to 5-7, and reacting at 100-140 DEG C for a period of time to obtain stable, high-brightness and bright-colored purple CQD. The wavelength of the prepared stable, high-brightness and bright-colored purple CQD is 427 nm, the fluorescence intensity is 8.8 * 10 < 6 > a.u., the width of FWHM is 59.15 nm, and the absolute quantum yield is 5.30%. The preparation method is simple, the preparation process is green and environment-friendly, and the prepared purple CQD powder is easy to preserve, not prone to getting damp and good in stability.

Description

technical field [0001] The invention belongs to the technical field of carbon quantum dots, and relates to a method for preparing stable, high-brightness and brightly colored purple CQDs. Background technique [0002] In 2004, some researchers accidentally discovered carbon quantum dots (CQD), which have unique fluorescence properties such as photoluminescence and excitation dependence, which caused a wave of research by scholars. Because of its high stability, biocompatibility, low cost, and easy modification, it is widely used in different fields such as biology, fluorescent probes, optoelectronic devices, and anti-counterfeiting. [0003] The doping of heterocyclic elements can lead to different optical properties of CQDs. Among them, N-doped blue and green CQDs already have high fluorescence intensity and quantum yield, while extremely short-wavelength (purple) CQDs are difficult to prepare. Low yield and low fluorescence intensity. At present, some researchers have pr...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15
CPCC09K11/65B82Y20/00B82Y40/00C01B32/15Y02B20/00
Inventor 吴琪琳赵雪贡永青何敬宗吴聪影刘玉慧
Owner DONGHUA UNIV
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