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Electrochemical preparation method of nitrogen-doped fluorescent carbon dots (NC-dots) with up-conversion and down-conversion functions

A technology of fluorescent carbon dots and conversion functions, applied in the field of carbon materials, can solve the problems of low fluorescence yield and high cost of products, and achieve the effects of high fluorescence yield, high universality and simple operation.

Inactive Publication Date: 2013-12-11
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has limitations on the carbon source, and the resulting product has a low fluorescence yield and high cost

Method used

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  • Electrochemical preparation method of nitrogen-doped fluorescent carbon dots (NC-dots) with up-conversion and down-conversion functions
  • Electrochemical preparation method of nitrogen-doped fluorescent carbon dots (NC-dots) with up-conversion and down-conversion functions
  • Electrochemical preparation method of nitrogen-doped fluorescent carbon dots (NC-dots) with up-conversion and down-conversion functions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] ① Control the potential with PS-305DM DC stabilized voltage power supply, and use platinum as the anode and cathode. In a 200ml beaker, add 20ml of water and 1.5g of sodium hydroxide to 140ml of ethanolamine, and use this as the electrolyte. NC-dots were prepared by electrochemical carbonization under constant potential mode for 4 hours by applying 15.0 volts.

[0059] ② After the reaction, the solution turns from colorless to brown-black, and it is allowed to stand still for several hours. Take the supernatant, and slowly add hydrochloric acid to it to neutralize the sodium hydroxide until it becomes neutral. Ethanol was then added to precipitate out the sodium salt. After resting, the supernatant was collected and the ethanol was removed by rotary evaporation.

[0060] ③ Concentrate the obtained solution, dialyze the C-dots solution with a dialysis bag with a cut-off of 1000, and obtain an aqueous solution of NC-dots after removing a small amount of salt.

[0061] T...

Embodiment 2

[0063] ①PS-305DM DC stabilized power supply control potential, platinum sheet as anode and cathode, in a 200ml beaker, add 20ml of water and 1.5g of sodium hydroxide to 150ml of ethanol / ethylenediamine (volume ratio 2; 1) to This serves as the electrolyte. NC-dots were prepared by electrochemical carbonization under constant potential mode for 4 hours by applying 15.0 volts.

[0064] ②After the reaction, the solution changed from colorless to brown-black, and stood still for several hours. Take the supernatant, and add hydrochloric acid to it to neutralize sodium hydroxide until it becomes neutral. Ethanol was added again, and a large amount of sodium salt was precipitated. Collect the reaction solution, remove ethanol by rotary evaporation (distilled ethanol can be used as carbonization raw material, or recycled to remove salt), and then ultrasonically disperse the obtained solid in pure water.

[0065] ③ The solution obtained by ultrasonic dispersion was dialyzed into the ...

Embodiment 3

[0068] ①PS-305DM DC stabilized power supply control potential, platinum sheet as anode and cathode, in a 200 ml beaker, add 20 ml of water and 1.5 g of sodium hydroxide to 150 ml of ethylene glycol / ethylenediamine (volume ratio 2; 1) , as the electrolyte. NC-dots were prepared by electrochemical carbonization under constant potential mode for 4 hours by applying 15.0 volts.

[0069] ②After the reaction, the solution changed from colorless to brown-black, and stood still for several hours. Take the supernatant, and add hydrochloric acid to it to neutralize sodium hydroxide until it becomes neutral. Ethanol was added again, and a large amount of sodium salt was precipitated. Collect the reaction solution, remove ethanol by rotary evaporation (distilled ethanol can be used as carbonization raw material, or recycled to remove salt), and then ultrasonically disperse the obtained solid in pure water.

[0070] ③ The solution obtained by ultrasonic dispersion was dialyzed into the N...

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Abstract

The invention belongs to the technical field of nanomaterials and relates to an electrochemical preparation method of nitrogen-doped fluorescent carbon dots (NC-dots) with up-conversion and down-conversion functions. The method comprises the steps of by taking an organic solvent as a carbon source, taking an alkaline substance and the organic solvent as electrolytes and taking platinum sheets as a positive electrode and a negative electrode, setting the electrolysis potential to 2.0-30.0 volt in a constant-potential mode, and carrying out electrochemical carbonization on organic matters for 2-5 hours, thereby obtaining a reaction solution; collecting a product solution, neutralizing, standing, and precipitating, thereby obtaining a supernatant; adding alcohol to precipitate salts, so as to obtain a NC-dots alcoholic solution; evaporating and concentrating the NC-dots alcoholic solution, and dialyzing, thereby obtaining a NC-dots aqueous solution. The method has the advantages that the simplicity and convenience in NC-dots synthesis are realized, the NC-dots with monodispersity and uniform particle diameter are obtained, and the obtained NC-dots have higher fluorescence yield (QY= 26.8%) and have good up-converted and down-converted fluorescence.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and relates to a method for preparing nitrogen-doped up-and-down conversion fluorescent carbon dots (NC-dots) using an organic solvent alcohol amine or an alcohol / amine mixture as a raw material. Background technique [0002] Recently, a carbonaceous fluorescent nanomaterial, carbon dots (C-dots), has received extensive attention. C-dots are monodisperse carbon nanomaterials with a spherical shape, and their particle size is generally less than 10 nm. It exhibits excellent fluorescent properties, such as photobleaching resistance, non-scintillation, tunable emission wavelength, up-conversion performance, etc.; at the same time, C-dots have small particle size, good water solubility, low toxicity, good biocompatibility, and cheap and easy Have to wait for the characteristics. Therefore, it has broad application prospects in materials science, biochemistry, biomedicine, etc. At present,...

Claims

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Application Information

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IPC IPC(8): C25B1/00C09K11/65
Inventor 张友玉邓建辉卢求钧李海涛刘美玲姚守拙
Owner HUNAN NORMAL UNIVERSITY
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