Rapid synthesis method for high-quantum-yield fluorescent carbon dots

A technology of fluorescent carbon dots and a synthesis method, applied in the fields of chemistry and nanomaterials science, can solve the problems of unfavorable continuous and large-scale production of fluorescent carbon quantum dots, low carbon quantum yield, non-renewable energy, etc. The effect of high yield and simple operation

Inactive Publication Date: 2015-08-19
GUANGXI TEACHERS EDUCATION UNIV
4 Cites 24 Cited by

AI-Extracted Technical Summary

Problems solved by technology

This method often requires strict experimental conditions and special energy sources, the cost is high, and the obtained carbon quantum yield is relatively low
Bottom-up synthesis method, that is, direct synthesis of fluorescent carbon quantum dots by pyrolysis or carbonization of suitable prec...
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Abstract

The invention discloses a rapid synthesis method for high-quantum-yield fluorescent carbon dots. The method comprises the following steps: (1) mixing citric acid monohydrate and ethylenediamine, and uniformly stirring to obtain a mixed solution; (2) adding the mixed solution in the step (1) into a microwave reactor for reaction, and setting the temperature as 130 DEG C; (3) cooling to obtain a brown liquid product, injecting the brown liquid product into a dialysis bag for dialysis, collecting liquid in the dialysis bag, performing rotary evaporation concentration, and freeze-drying concentrated samples to obtain the fluorescent carbon dots, wherein the molecular weight of the dialysis bag is 500Da. The operation is simple, and raw materials are easily obtained and cheap. Reaction conditions can be regulated, the quantum yield of the obtained carbon quantum dots is high, the problem that rapid large-scale production cannot be carried out by a conventional fluorescent carbon dot preparation method due to the limitation of a process and the raw materials is solved, and the problem of lower quantum yield of the carbon quantum dots is solved. The fluorescent carbon dots can be used for metal ion detection, biological marking, biological imaging and the like.

Application Domain

Technology Topic

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  • Rapid synthesis method for high-quantum-yield fluorescent carbon dots
  • Rapid synthesis method for high-quantum-yield fluorescent carbon dots
  • Rapid synthesis method for high-quantum-yield fluorescent carbon dots

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0027] Example 1
[0028] A method for synthesizing fast and high quantum yield fluorescent carbon dots, comprising the following steps:
[0029] 1) citric acid monohydrate and ethylenediamine are mixed and stirred to obtain a mixed solution;
[0030] 2) The mixed solution of step 1) was placed in a microwave reactor whose model was CEM Discover and reacted, and the temperature was set to 130 °C;
[0031] 3) cooling to obtain a brown liquid product, inject the brown liquid product into a dialysis bag for dialysis, the molecular weight of the dialysis bag is 500Da, collect the liquid in the dialysis bag, carry out rotary evaporation concentration, and freeze-dry the concentrated sample to obtain Fluorescent carbon dots.
[0032] Wherein, the conditions of the rotary evaporation concentration are as follows: the temperature of the rotary evaporator is set to 50° C., and the time of the rotary evaporation is set to be 10 min.
[0033] Wherein, in the step 3), the solution after the microwave reaction is cooled to 50°C.
[0034] Wherein, the consumption of citric acid monohydrate in the step 1) is 0.42 g, and the consumption of ethylenediamine is 400 μL, and the two are dissolved in 5 mL of ultrapure water to obtain the mixed solution.
[0035] Wherein, in step 2), the time set for the microwave reactor is 15 minutes, and the power of the microwave reactor is 80w.
[0036] In order to further illustrate the advantages of the present invention, the fluorescent carbon dots obtained in Example 1 are used for further analysis.
[0037] figure 1 are the ultraviolet absorption spectrum, fluorescence emission spectrum and fluorescence excitation spectrum of the fluorescent carbon dots described in Example 1 of the present invention, from figure 1 It can be seen that the ultraviolet characteristic absorption peak of the fluorescent carbon dot is at 280-400 nm, and the absorbance of the fluorescent carbon dot is the strongest at 340 nm. In the fluorescence emission spectrum, the maximum emission wavelength of the fluorescent carbon dots is 442 nm.
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