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Method for preparing luminescent carbon dots from carbohydrate

A technology of carbohydrates and carbon dots, used in the preparation/purification of carbon compounds and carbons, chemical instruments and methods, etc., to achieve the effect of high luminous intensity and high quantum yield

Inactive Publication Date: 2014-06-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no reports about the use of carbohydrates to obtain high quantum yield fluorescent carbon dots in one-step passivation in a hydrothermal method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Weigh 0.2g of rice and 0.5g of ethanolamine, add 10mL of distilled water, stir slightly, pour into a stainless steel jacket lined with polytetrafluoroethylene reaction kettle, tighten it and put it in an oven at 200°C for 5 hours. After cooling to room temperature, the reaction kettle was opened and the black solution was poured out. The obtained solution was vacuum filtered to obtain a brown-black filtrate. Adjust the pH value of the filtrate to 6 with dilute hydrochloric acid, and put it into a dialysis bag for dialysis purification. The liquid in the dialysis bag is filtered with an ultrafiltration membrane, the solution is evaporated and dried to obtain carbon nanoparticles, and then dissolved in deionized water to obtain a luminescent carbon nanoparticle aqueous solution. According to transmission electron microscope analysis, the prepared carbon dots are approximately spherical in shape and have good dispersion. The diameter of the carbon dots is about 7-9nm.

Embodiment 2

[0014] Mix glucose and ethanolamine into a 0.5mol / L aqueous solution, and pour 11ml of the mixed solution of glucose and ethanolamine with a molar ratio of 1:1.2 into a reaction kettle with a stainless steel jacket and a polytetrafluoroethylene lining, and put it at 180°C after tightening Reaction in the oven for 14h. After cooling to room temperature, the reaction kettle was opened and the black solution was poured out. The obtained solution was vacuum filtered to obtain a brown-black filtrate. Adjust the pH value of the filtrate to 6 with dilute hydrochloric acid, put it into a dialysis bag for dialysis purification. The liquid in the dialysis bag is filtered with an ultrafiltration membrane to obtain a luminescent carbon nanoparticle aqueous solution. According to the test of fluorescence spectrum, there is wide excitation in the wavelength range of 310-510nm, and there is fluorescence emission in the wavelength range of 445-579nm. When the excitation wavelength is 390nm,...

Embodiment 3

[0016] Mix glucose and ethylenediamine into a 0.5mol / L aqueous solution, pour 14mL of the glucose-ethylenediamine mixed solution with a molar ratio of 1:1 into a reaction kettle with a stainless steel outer jacket and a polytetrafluoroethylene lining, and tighten it Put it in an oven at 200°C for 8 hours. After cooling to room temperature, the reaction kettle was opened and the black solution was poured out. The obtained solution was vacuum filtered to obtain a brown-black filtrate. Adjust the pH value of the filtrate to 7 with dilute hydrochloric acid, put it into a dialysis bag for dialysis purification. The liquid in the dialysis bag is filtered with an ultrafiltration membrane, and the dried carbon nanoparticles obtained after the solution is evaporated are then dissolved in deionized water to obtain an aqueous solution of the carbon nanoparticles. According to the test of fluorescence spectrum, there is wide excitation in the wavelength range of 330-450nm, and there is ...

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Abstract

The invention relates to a method for preparing luminescent carbon dots from carbohydrate. The carbohydrate based carbon dots prepared by the invention can be used for biological imaging and analysis to determine the content of metal ions. The method for preparing luminescent carbon dots from carbohydrate provided by the invention is as below: mixing carbohydrates with a modifier with amino at different molar ratios; reacting for a certain time by a hydrothermal method; filtering; regulating the pH to a neutral state, conducting dialysis and purification to remove excessive salt, so as to obtain the carbohydrate based luminescent carbon dots. The method for preparing the luminescent carbon dots provided by the invention uses carbohydrates as raw materials, which are easily available and have low cost; the obtained carbon dots have high quantum yield; and the equipment for the preparation process is simple,the method can be completed in general chemistry laboratory, and is easy for popularization.

Description

technical field [0001] The invention relates to a method for preparing luminescent carbon dots from carbohydrates, and belongs to the technical field of preparation of nanometer materials and fluorescent carbon materials. Background technique [0002] Carbon quantum dots are another new type of carbon nanomaterial after fullerene, carbon nanotube and graphene. It is a spherical fluorescent carbon nanoparticle with a size generally less than 10nm and good dispersion. In recent years, fluorescent carbon nanoparticles have great potential application value in the field of nanobiology and catalysis. Compared with traditional quantum dots and organic dyes, carbon nanoparticles are chemically inert, stable, low toxicity and easy to modify. a huge advantage. At present, there are many methods for preparing carbon quantum dots, but they can be generally divided into two categories: top-down and bottom-up. The top-down method is obtained directly from bulk carbon materials or carbo...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00C09K11/65C01B32/05C01B32/312
Inventor 郭明林殷雪雁
Owner TIANJIN POLYTECHNIC UNIV
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