Preparation method and application of phosphorus-doped fluorescent carbon quantum dots

A technology of carbon quantum dots and phosphorus doping, applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, measuring devices, etc., can solve the problem of high cost, unfavorable continuous and large-scale production of carbon quantum dots, and low fluorescence quantum yield of carbon quantum dots and other problems, to achieve the effect of convenient operation, good solubility and dispersibility, and rapid completion

Inactive Publication Date: 2016-09-21
SHANXI UNIV
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  • Description
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  • Application Information

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Problems solved by technology

These methods often require strict experimental conditions or special materials, the cost is high, and the fluorescence quantum yield of the obtained carbon quantum dots is low; it is also not conducive to the continuous and large-scale production of carbon quantum dots

Method used

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  • Preparation method and application of phosphorus-doped fluorescent carbon quantum dots
  • Preparation method and application of phosphorus-doped fluorescent carbon quantum dots
  • Preparation method and application of phosphorus-doped fluorescent carbon quantum dots

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Experimental program
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Effect test

Embodiment 1

[0033] Step 1, weigh 1.0g of phosphorus pentoxide and put it in a glass container, add 2mL of 30% phytic acid to react spontaneously, stir well, and obtain a dark brown sticky substance;

[0034] Step 2, after the glass container is cooled naturally, filter the insoluble matter with 11cm filter paper to obtain a clear dark brown solution;

[0035] Step 3, separation by size exclusion chromatography, Sephadex G-25 is used as filler, water is used as mobile phase, in chronological order, the color development of carbon quantum dot aqueous solution is tested by PH test paper as the standard, and red is displayed on PH test paper , the obtained fraction is named P-CDs (A), when the pH test paper color is yellow and the fraction color is yellow, the obtained fraction is named P-CDs (B), the pH test paper color is yellow and the fraction color is light pink is the obtained fraction Named P-CDs(C), and separated to obtain three carbon quantum dot aqueous solutions of A, B, and C;

...

Embodiment 2

[0039] Step 1, weigh 1.0g of phosphorus pentoxide and place it in a glass container, add 2mL of 10% phytic acid to react spontaneously, stir well, and obtain a dark brown sticky substance;

[0040] Step 2, after the glass container is cooled naturally, filter the insoluble matter with 11cm filter paper to obtain a clear dark brown solution, and obtain phosphorus-doped carbon quantum dots by freeze-drying;

[0041] In step 3, the above-mentioned P-CDs aqueous solution is freeze-dried to obtain the target carbon quantum dots, and its relative quantum yield (based on quinine sulfate) is 5.6%.

Embodiment 3

[0043] Step 1, weigh 1.0g of phosphorus pentoxide and place it in a glass container, add 2mL of 20% phytic acid to react spontaneously, and stir thoroughly to obtain a dark brown sticky substance;

[0044] Step 2, after the glass container is naturally cooled, filter with 11cm filter paper to remove insoluble matter to obtain a clear dark brown solution, and obtain carbon quantum dots by freeze-drying;

[0045] In step 3, the above-mentioned P-CDs aqueous solution is freeze-dried to obtain the target carbon quantum dots, and its relative quantum yield (taking quinine sulfate as a standard) is 6%.

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Abstract

The invention relates to a preparation method of phosphorus-doped fluorescent carbon quantum dots. The preparation method comprises the following steps: (1) adding phytic acid into a glass container, then adding secondary water, fully stirring, and carrying out ultrasonic treatment to obtain a clear solution; then, rapidly adding the clear solution into phosphorus pentoxide to obtain a dark brown solution; (2) after the glass container is naturally cooled, filtering the dark brown solution by using filter paper, and removing undissolved substance to obtain a clear dark brown solution; (3) separating by means of exclusion chromatography, wherein sephadex G-25 is taken as filler, and water is taken as a mobile phase, and separating according to time order to obtain three carbon quantum dot aqueous solutions; (4) respectively carrying out freeze drying on the three carbon quantum dot aqueous solutions to obtain three target products. The method is simple in operation technology, wide in source of raw materials, low in price of the raw materials, low in requirement for separation conditions and free from energy consumption; the obtained carbon quantum dots are stable in optical properties. The prepared phosphorus-doped fluorescent carbon quantum dots can be used for Fe<3+> ion detection, tetracycline detection and cell imaging.

Description

technical field [0001] The invention relates to luminescent nanomaterials, in particular to carbon quantum dots, in particular to a preparation method and application of phosphorus-doped fluorescent carbon quantum dots (P-CDs) based on exclusion chromatography. Background technique [0002] Carbon quantum dots (carbon dots, C-dots) appear in people's field of vision as the smallest member of the carbon material family, which was developed by Scrivens et al. A new type of nanomaterial with carbon as the skeleton structure was discovered for the first time in the study of single-walled carbon nanotubes in 2010. Compared with traditional semiconductor quantum dots and organic dyes, carbon quantum dots, as a new type of luminescent material, not only maintain the carbon material It has the advantages of low toxicity, good biocompatibility, etc., and has the advantages of convenient synthesis, easy modification, adjustable luminescence range, large two-photon absorption cross sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/70G01N21/64
CPCC09K11/70G01N21/6428G01N2021/6432
Inventor 高艺芳弓晓娟刘洋董川
Owner SHANXI UNIV
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