Preparation method of high-quantum-yield dual-emitting fluorescent carbon dots and application thereof in detection of PFOS (perfluorooctane sulfonates)

A dual-emission fluorescent and high-quantum technology, applied in the field of nanomaterials, can solve the problems of low quantum yield and difficulty in popularizing the application of fluorescent carbon quantum dots, and achieve the effect of simple preparation method, easy operation of preparation method, and cheap and easy-to-obtain raw materials

Active Publication Date: 2018-09-14
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the quantum yield of both single-emission fluorescent carbon dots and double-emission fluorescent carbon dots is low, making it difficult to promote the application of fluorescent carbon quantum dots.

Method used

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  • Preparation method of high-quantum-yield dual-emitting fluorescent carbon dots and application thereof in detection of PFOS (perfluorooctane sulfonates)
  • Preparation method of high-quantum-yield dual-emitting fluorescent carbon dots and application thereof in detection of PFOS (perfluorooctane sulfonates)
  • Preparation method of high-quantum-yield dual-emitting fluorescent carbon dots and application thereof in detection of PFOS (perfluorooctane sulfonates)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The influence of embodiment 1 ethylenediamine and phosphoric acid ratio on carbon dot

[0046]Accurately weigh eight parts of 3mmol 2,4-diaminotoluene and 200μL ethylenediamine in eight 25mL polytetrafluoroethylene reaction kettles, and then use volume ratio ethylenediamine:phosphoric acid=1:(0, 1, 1.5 , 2, 2.5, 3, 4, 6) Measure 0, 200 μL, 300 μL, 400 μL, 500 μL, 600 μL, 800 μL, and 1200 μL of phosphoric acid solution in corresponding reaction kettles respectively, and then add 4 mL of water to each of the eight reaction kettles. Then the closed reaction kettle was placed in a blast drying oven at 200° C. for 10 h. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the product is centrifugally dialyzed and freeze-dried to obtain a carbon dot solid.

[0047] Dilute the obtained carbon dots with water to prepare a carbon dot mother solution with a concentration of 1 mg / mL, take 200 μL, dilute to 1 mL with water, and measure ...

Embodiment 2

[0048] The influence of embodiment 2 ethylenediamine and phosphoric acid volume on carbon point

[0049] Accurately weigh five parts of 3mmol 2,4-diaminotoluene in five 25mL polytetrafluoroethylene reaction kettles, and then simultaneously expand the volume of the two according to the volume ratio of ethylenediamine:phosphoric acid=1:2 and add them to the reaction In the kettle, measure 200 μL, 400 μL, 600 μL, 800 μL, and 1000 μL of ethylenediamine, and the corresponding phosphoric acid volumes are 400 μL, 800 μL, 1200 μL, 1600 μL, and 2000 μL, respectively. Next, 4 mL of water was added to the reaction kettle, and then the closed reaction kettle was placed in a blast drying oven at 200° C. for 10 h of heating reaction. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the product is centrifugally dialyzed and freeze-dried to obtain a carbon dot solid.

[0050] Adopt the method identical with embodiment 1 to obtain its fluoresce...

Embodiment 3

[0051] Example 3 Effect of 2,4-diaminotoluene on carbon dots

[0052] First weigh 0, 1.5mmol, 3mmol, 4.5mmol, 6mmol, 7.5mmol, 9mmol 2,4-diaminotoluene in the reaction kettle respectively, (the ratio of the amount of corresponding substances is 2,4-diaminotoluene:ethylene diaminotoluene Amine: phosphoric acid = 0:4:8, 0.5:4:8, 1:4:8, 1.5:4:8, 2:4:8, 2.5:4:8, 3:4:8) and then measure them accurately Take seven portions of 800 μL phosphoric acid and 1600 μL of ethylenediamine in seven 25 mL polytetrafluoroethylene reactors. Next, 4 mL of water was added to the reaction kettle, and then the closed reaction kettle was placed in a blast drying oven at 200° C. for 10 h of heating reaction. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the product is centrifugally dialyzed and freeze-dried to obtain a carbon dot solid.

[0053] Adopt the method identical with embodiment 1 to obtain its fluorescence spectrogram ( image 3 a,b). Suc...

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Abstract

The invention relates to the field of nano materials, in particular to a preparation method of high-quantum-yield dual-emitting fluorescent carbon dots and application thereof in the detection of PFOS(perfluorooctane sulfonates). The high-quantum-yield dual-emitting fluorescent carbon dots are synthesized from 2,4-diaminotoluene and phosphoric acid by means hydrothermal process. The carbon dots prepared via the preparation method can emit fluorescence of two wavelengths under the excitation of light having wavelengths of 280 nm and 340 nm, emit fluorescence of the wavelengths of 350 nm and 515 nm under the excitation of 280 nm light, and emit fluorescence of the wavelengths of 434 nm and 502 nm under the excitation of 340 nm light; both two emitting centers can reach 44% and above in fluorescent quantum yield. When the carbon dots are used in measuring PFOS, the fluorescent strength ratio of the two emitting wavelengths of the carbon dots under the two exciting wavelengths is linearlyrelated to PFOS concentration; two results can be made and can verify each other, and measuring results are more accurate.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a method for preparing a double-emitting fluorescent carbon dot with high quantum yield and its application in detecting PFOS. Background technique [0002] As a fluorescent carbon nanomaterial discovered in recent years, carbon dots have significant advantages, such as good biocompatibility, suitable size, adjustable excitation and emission wavelengths, and good photostability. The synthesis method of fluorescent carbon dots has been developed to a great extent, and its advantages of low cost and wide application have attracted more and more researchers' attention. [0003] So far, fluorescent carbon dots are mostly divided into single-emission carbon dots and double-emission carbon dots, that is, only one or two fluorescence emission under excitation of a single wavelength. Compared with single-emitting carbon dots, dual-emitting fluorescent carbon dots have many advantages. Dual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65G01N21/64
CPCC01P2002/80C01P2002/82C01P2004/04C09K11/65C01B32/15G01N21/6402
Inventor 谭克俊朱盼盼
Owner SOUTHWEST UNIV
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