Regulation and preparation method and application of multicolor fluorescent carbon dots

A technology of fluorescent carbon dots and carbon dots, which is applied in the field of preparation and application of fluorescent carbon dots, can solve the problems of cumbersome, time-consuming methods, and limit practical applications, and achieve the goals of expanded application, simple operation steps, good solubility and dispersibility Effect

Inactive Publication Date: 2019-01-25
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These literatures have reported the preparation of multicolor fluorescent carbon dots, but their methods are relatively time-consuming and cumbersome, which severely limits their practical application in opt

Method used

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  • Regulation and preparation method and application of multicolor fluorescent carbon dots
  • Regulation and preparation method and application of multicolor fluorescent carbon dots
  • Regulation and preparation method and application of multicolor fluorescent carbon dots

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Embodiment 1

[0022] 1) Weighing 0.3 g of p-phenylenediamine and dissolving it in secondary water, then adding sulfuric acid to the solution to adjust the pH of the solution to 4, and ultrasonically obtaining a uniformly mixed solution;

[0023] 2) Transfer the above solution to a 50mL hydrothermal reaction kettle, react at 200°C for 10h, wait for the reaction to stop and let it cool down to room temperature, centrifuge to remove insoluble matter and take the supernatant, pass through a dialysis bag of 500-1000Da, in Dialysis treatment in a glass container for at least three days to obtain a pure aqueous solution of carbon dots;

[0024] 3) The above carbon dot aqueous solution was freeze-dried to obtain dark red carbon dots. Its relative quantum yield (based on rhodamine B) is 12.5%, and it exhibits red fluorescence (R-CDs).

Embodiment 2

[0026] 1) Weigh 0.3g of p-phenylenediamine and dissolve it in 20mL of secondary water, then add a small amount of HCl to the solution to adjust the pH of the solution to 3, and ultrasonically obtain a uniformly mixed solution;

[0027] 2) Transfer the above solution to a 50mL hydrothermal reaction kettle, react at 200°C for 8h, let it stand and cool to room temperature after the reaction stops, centrifuge to remove insoluble matter and take the supernatant, pass it through a 500-1000Da dialysis bag, Dialysis treatment in a glass container for at least three days to obtain a pure aqueous solution of carbon dots;

[0028] 3) The above aqueous solution of carbon dots was freeze-dried to obtain purple powdery carbon dots. Its relative quantum yield (based on rhodamine B) is 10.8%, showing orange-red fluorescence.

Embodiment 3

[0030] 1) Weigh 0.3g of p-phenylenediamine and dissolve it in secondary water, without any acid-base treatment, and ultrasonically obtain a uniform mixed solution;

[0031] 2) Transfer the above solution to a 50mL hydrothermal reaction kettle, react at 200°C for 10h, wait for the reaction to stop and let it cool down to room temperature, centrifuge to remove insoluble matter and take the supernatant, pass through a dialysis bag of 500-1000Da, in Dialysis treatment in a glass container for at least three days to obtain a pure aqueous solution of carbon dots;

[0032] 3) The above aqueous solution of carbon dots was freeze-dried to obtain purple powdery carbon dots. Its relative quantum yield (based on rhodamine B) is 7.4%, showing yellow fluorescence (Y-CDs).

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Abstract

The invention provides a regulation and preparation method and application of multicolor fluorescent carbon dots. The preparation method of the fluorescent carbon dots comprises the steps that p-phenylenediamine with the certain mass is dissolved into secondary water, and subjected to ultrasonic blending, or ultrasonic blending is conducted after pH value of the solution is conditioned; the solution is transferred into a hydrothermal reaction still and reacts for 8-10 h at the temperature of 200-220 DEG C, the product is cooled to be at the room temperature and centrifugalized, the supernatantliquid is taken and subjected to dialysis treatment, and a pure carbon dot water solution is obtained; and the carbon dot water solution is freeze-dried, and the different fluorescence emitting carbon dots are obtained. The operation steps are simple, and the raw material does not need to be treated or modified through a surface passivation agent. The obtained carbon dots have the good solubilityand dispersibility in the water solution. The prepared carbon dot quantum yield is high, taking rhodamine B (the quantum yield in ethyl alcohol is 89%) as the reference substance, the quantum yield of the prepared carbon dots is usually between 7.4% and 13.6%, and the prepared fluorescent carbon dots can be applied to removal of free radicals and cell imaging.

Description

technical field [0001] The invention relates to the preparation and application of fluorescent carbon dots, in particular to a control preparation method and application of multicolor fluorescent carbon dots. Background technique [0002] Carbon dots have good application prospects in many fields such as biological imaging, environmental monitoring, and nanomaterials due to their excellent fluorescence properties, good chemical stability, biocompatibility, and surface function adjustability. In recent years, most of the synthesized carbon dots emit blue-green fluorescence with excitation wavelength dependence, which limits their applications in biomedical and optoelectronic devices. Ding et al. used a one-pot method to synthesize fluorescent carbon dots and obtained multicolor fluorescent carbon dots by silica column chromatography. They attributed the red shift of carbon dot fluorescence to the difference in quantum size effect and surface state (Acs Nano,10 (2016) 484-91)...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00A61K33/44A61P39/06G01N21/64
CPCA61K33/44A61P39/06B82Y20/00B82Y40/00C09K11/65G01N21/6486
Inventor 焦媛孟雅婷路雯婧高艺芳张建彪董川
Owner SHANXI UNIV
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