Fluorescent carbon dots as well as low-pollution recyclable synthesis method and application thereof

A technology of fluorescent carbon dots and synthesis methods, applied in fluorescence/phosphorescence, chemical instruments and methods, nano-carbon, etc., can solve problems such as waste, limited application, pollution, etc., to reduce pollution, reduce material waste, and achieve high fluorescence quantum yield. rate effect

Pending Publication Date: 2022-04-08
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the development of technology, the synthesis methods of carbon dots are becoming more and more diversified. However, in many current synthesis methods of carbon dots, certain purification and separation are always required, and the pollution and waste caused by the specific steps are seriously limited. Its application in actual industrial production

Method used

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  • Fluorescent carbon dots as well as low-pollution recyclable synthesis method and application thereof
  • Fluorescent carbon dots as well as low-pollution recyclable synthesis method and application thereof
  • Fluorescent carbon dots as well as low-pollution recyclable synthesis method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example provides a low-pollution and recyclable synthesis method of fluorescent carbon dots, which is prepared according to the following steps:

[0034] S1. Dissolve 1 g of citric acid and 2 g of urea in 10 ml of nitrogen-nitrogen dimethylformamide, and perform ultrasonic vibration at room temperature to disperse evenly to obtain a mixed solution;

[0035] S2. Place the shaken mixed solution in a hydrothermal reaction kettle, heat it to 160° C. and keep it warm for 8 hours, then cool it down to room temperature naturally;

[0036] S3, the prepared carbon dot solution is dissolved in nitrogen nitrogen dimethyl formamide, using thin layer silica gel (400 mesh) chromatography, the developing solvent is nitrogen nitrogen dimethyl formamide, observed under ultraviolet light, can obtain blue , green, red fluorescent carbon dots and a mixture of fluorescent carbon dots with variegated colors;

[0037] S4, using a rotary evaporator to evaporate the carbon dots with blue,...

Embodiment 2

[0046] This embodiment provides an application of fluorescent carbon dots in the preparation of luminescent thin films.

[0047]Step A. Take enough carbon dot powder prepared in Example 1 and dissolve it in ethanol solution to prepare a carbon dot / ethanol solution with a concentration of 30mg / ml. Ultrasonic vibration is carried out at room temperature to disperse evenly. Take 1ml of carbon dot / ethanol solution and add 9g Epoxy resin glue A, after mixing evenly, add 3g of epoxy resin glue B, and ultrasonically mix evenly to obtain a mixture;

[0048] Step B. Pour the mixture into a mold, put it in a vacuum drying oven, extract the gas and ethanol in the mixed glue, and dry it under vacuum at 80°C to obtain a carbon dot fluorescent film.

[0049] Figure 7 is the photo of the luminescent film based on fluorescent carbon dots under ultraviolet light, by Figure 7 It can be seen that the luminescent films prepared by carbon dots with different fluorescent colors have different f...

Embodiment 3

[0051] This embodiment provides an application of fluorescent carbon dots in biological imaging.

[0052] Step A. Dissolve the carbon dots prepared in Example 1 in phosphate buffer (PBS) to prepare a carbon dot PBS solution with a concentration of 3 mg / ml, and use the carbon dot PBS solution to incubate the cells to prepare cells labeled with carbon dots;

[0053] Step B. Use a confocal microscope to observe the morphological structure of the cells.

[0054] Figure 8 is the biological imaging based on fluorescent carbon dots, where (a) is a bright-field photo, (b) is a single-photon imaging photo, (c) is a two-photon fluorescence photo, (d) is a superimposed photo of one-photon and two-photon imaging, and the scale = 20 µm, by Figure 8 It can be seen that the red carbon dots have good single-photon and two-photon imaging capabilities.

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Abstract

The invention discloses a fluorescent carbon dot as well as a low-pollution recyclable synthesis method and application thereof, and belongs to the technical field of design and application of fluorescent carbon nanomaterials. The synthesis method comprises the following steps: dissolving citric acid and urea in N, N-dimethylformamide, and carrying out ultrasonic oscillation and uniform dispersion at normal temperature to obtain a mixed solution; carrying out hydrothermal reaction on the mixed solution at 150-170 DEG C to prepare a carbon dot solution; dissolving the carbon dot solution in N, N-dimethylformamide, and carrying out chromatographic separation to obtain a blue, green and red fluorescent carbon dot solution and a mixed fluorescent carbon dot solution with mixed color; performing rotary evaporation on the obtained blue, green and red fluorescent carbon dot solution and the mixed fluorescent carbon dot solution with the mixed color to obtain blue, green and red fluorescent carbon dot solid powder; collecting a recycled material; and taking the recovered material as a reaction raw material, and repeating the steps S1 to S4 to prepare the fluorescent carbon dots. When the method is used for preparing the fluorescent carbon dots, pollution and material waste are effectively reduced.

Description

technical field [0001] The invention relates to the technical field of design and application of fluorescent carbon nanomaterials, in particular to a fluorescent carbon dot and its low-pollution recyclable synthesis method and application. Background technique [0002] As a new fluorescent nanomaterial with high fluorescence efficiency, adjustable emission wavelength, good biocompatibility, simple preparation method, low preparation cost and low biological toxicity, fluorescent carbon dots have been proved to be used in light emitting electrodes, biological Imaging, energy conversion, catalysis, sensors and many other fields have achieved a wide range of applications. With the development of technology, the synthesis methods of carbon dots are becoming more and more diversified. However, in many current synthesis methods of carbon dots, certain purification and separation are always required, and the pollution and waste caused by the specific steps are seriously limited. it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B32/15G01N21/64B82Y20/00B82Y40/00
Inventor 娄庆沈成龙单崇新
Owner ZHENGZHOU UNIV
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