A kind of red fluorescent carbon dot and its preparation method and application

A technology for red fluorescence and fluorescent carbon dots, which is applied in the field of red fluorescent carbon dots and their preparation, can solve the problems of biological tissue damage, weak emission, and limited application of carbon dots, and achieves stable optical properties, good solubility and dispersibility, and good Detect the effect of the effect

Active Publication Date: 2021-07-02
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the as-prepared Cdots exhibit blue-green emission with weak emission in the long wavelength region (yellow to red)
The application of carbon dots in the biomedical field is limited due to the blue autofluorescence of biological matrices and the susceptibility of biological tissues to damage by ultraviolet excitation light.

Method used

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  • A kind of red fluorescent carbon dot and its preparation method and application
  • A kind of red fluorescent carbon dot and its preparation method and application
  • A kind of red fluorescent carbon dot and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Dissolve 2.5 mg of phenol saffron and 1.5 g of citric acid in 5 mL of deionized water at room temperature, stir well, and sonicate to obtain a clear solution.

[0032] Step 2, transfer the solution to a 25mL hydrothermal reaction kettle.

[0033] Step 3: Put the hydrothermal kettle in an oven and react at 180°C for 6 hours to obtain a red solution.

[0034] Step 4, take out the hydrothermal reaction kettle, cool naturally, and centrifuge the obtained carbon dot solution at 10000rpm for 10min to remove insoluble matter. Further filter with a 0.22 μm microporous membrane.

[0035] In step 5, red fluorescent carbon dots are obtained after freeze-drying the aqueous solution of fluorescent carbon quantum dots. Its fluorescence quantum yield (based on rhodamine B) is 8.3%.

Embodiment 2

[0037] Step 1, at room temperature, dissolve 1.8 mg of phenol saffron red and 1.2 g of citric acid in 2.5 mL of deionized water, stir well, and sonicate to obtain a clear solution.

[0038] Step 2, transfer the solution to a 25mL hydrothermal reaction kettle.

[0039] Step 3: Put the hydrothermal kettle in an oven and react at 160°C for 4 hours to obtain a red solution.

[0040] Step 4, take out the hydrothermal reaction kettle, cool naturally, and centrifuge the obtained carbon dot solution at 10000rpm for 10min to remove insoluble matter. Further filter with a 0.22 μm microporous membrane.

[0041] In step 5, red fluorescent carbon dots are obtained after freeze-drying the aqueous solution of fluorescent carbon quantum dots. Its fluorescence quantum yield (based on rhodamine B) is 3.8%.

Embodiment 3

[0043] Step 1. Dissolve 3.0 mg of phenol saffron and 1.8 g of citric acid in 7.5 mL of deionized water at room temperature, stir well, and sonicate to obtain a clear solution.

[0044] Step 2, transfer the solution to a 25mL hydrothermal reaction kettle.

[0045] Step 3: Put the hydrothermal kettle in an oven and react at 220°C for 8 hours to obtain a red solution.

[0046] Step 4, take out the hydrothermal reaction kettle, cool naturally, and centrifuge the obtained carbon dot solution at 10000rpm for 10min to remove insoluble matter. Further filter with a 0.22 μm microporous membrane.

[0047] In step 5, red fluorescent carbon dots are obtained after freeze-drying the aqueous solution of fluorescent carbon quantum dots. Its fluorescence quantum yield (based on rhodamine B) is 6.7%.

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Abstract

The invention provides a carbon dot emitting red fluorescence and a preparation method thereof, and the carbon dot is used for detecting nitrite. The carbon dot is a red fluorescent carbon dot prepared by a one-step hydrothermal method using phenol saffron red and citric acid as raw materials. The preparation method of the carbon dot is simple and convenient, and the prepared carbon dot has extremely small size, good water solubility and excellent light stability. When nitrite exists, the fluorescence of carbon dots is effectively quenched, and the content of nitrite in the sample can be detected according to the degree of fluorescence change. Compared with the traditional method, the method for detecting nitrite provided by the invention is simple, does not require additional modification of markers, can directly detect samples, and has more advantages in practical applications.

Description

technical field [0001] The invention relates to fluorescent carbon dots, in particular to a red fluorescent carbon dot and a preparation method thereof, and the use of the carbon dots for the detection of nitrite. Background technique [0002] Nitrite is a common nitrogenous compound widely present in food processing and environmental waters. The interaction between excess nitrite and amines can generate carcinogenic N-nitrosamines, which pose a serious threat to public health. Therefore, various countries and regions have issued strict regulations on its use and dosage. For example, the maximum content of nitrite in pickled food in our country cannot exceed 20mg / kg. The World Health Organization clearly stipulates that the maximum limit of nitrite in drinking water is 3mg / L. At present, the detection of nitrite mainly involves electrochemical methods, chromatography and spectrophotometry. Compared with other methods, fluorescence spectroscopy is favored due to its simpl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65G01N21/64
CPCC09K11/65G01N21/6428G01N2021/6432
Inventor 贾晶路雯婧李林董川双少敏
Owner SHANXI UNIV
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