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Preparation method for carbon quantum dots having controllable electroluminescent and photoluminescent performances

A technology of carbon quantum dots and photoluminescence, which is applied in the field of preparation of carbon quantum dots, achieves excellent biocompatibility, flexible operation, and broadened application effects

Inactive Publication Date: 2017-03-01
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanism by which surface treatment changes the fluorescence properties of C-dots, especially the electroluminescent properties of C-dots, has not been clarified so far.

Method used

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  • Preparation method for carbon quantum dots having controllable electroluminescent and photoluminescent performances
  • Preparation method for carbon quantum dots having controllable electroluminescent and photoluminescent performances
  • Preparation method for carbon quantum dots having controllable electroluminescent and photoluminescent performances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Prepared sucrose solution: add 6 g of sucrose into NaOH solution with a pH of 8, stir well and set aside. Wherein, the concentration of sucrose is 0.04 g / mL.

[0049] (2) Insert the working electrode platinum plate electrode and the counter electrode platinum grid electrode into the obtained solution, under the condition of vigorous stirring, apply a voltage of 4V, and the temperature of the water bath is 50°C, and react for 1.5h.

[0050] (3) After the reaction solution was cooled to room temperature, the solution was dialyzed in pure water for 1 day using a 3000 Da dialysis membrane to remove residual salts. The obtained liquid is vacuum freeze-dried to obtain a powdery solid, that is, carbon quantum dots with adjustable electroluminescence and photoluminescence properties, which are stored for future use. The morphology characterization diagram of carbon quantum dots is shown in figure 2 A and figure 2 A0.

[0051] (4) Product structure characterization: (1...

Embodiment 2

[0054] (1) Prepared sucrose solution: add 6 g of sucrose into NaOH solution with pH 12, and add 0.3-2.0 g of CTAB, mix and stir evenly for use. Wherein, the concentration of sucrose is 0.04 g / mL.

[0055] (2) Insert the working electrode platinum plate electrode and the counter electrode platinum mesh electrode into the obtained solution, under the condition of vigorous stirring, apply a voltage of 4V, and the temperature of the water bath is 50° C., and react for 2 hours.

[0056] (3) After the reaction solution was cooled to room temperature, the solution was dialyzed in pure water for 1 day using a 3000 Da dialysis membrane to remove residual salts. The obtained liquid is vacuum freeze-dried to obtain a powdery solid, that is, carbon quantum dots with adjustable electroluminescence and photoluminescence properties, which are stored for future use. The morphology characterization diagram of carbon quantum dots is shown in figure 2 B and figure 2 B0.

[0057] (4) Produc...

experiment example 2

[0059] The structure of the carbon quantum dots prepared in Experimental Example 2 is characterized by the same parameters as the carbon quantum dots in Example 1, but its fluorescence performance is significantly improved, while the electroluminescent properties are weakened, indicating that the water-soluble system electrochemically prepares carbon quantum dots and adds them to the surface. The passivating agent CTAB can effectively change the fluorescence and electroluminescence properties of carbon quantum dots, and selectively obtain carbon quantum dots with excellent photoluminescence properties.

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Abstract

The invention discloses a preparation method for carbon quantum dots having controllable electroluminescent and photoluminescent performances. The preparation method includes the steps of: regulating the pH of a sucrose water solution to alkaline with sucrose as a carbon source, inserting a working electrode, intensively stirring the solution, and applying a voltage to carry out a reaction to obtain a product solution; collecting the product solution and separating out salts to obtain a carbon quantum dot solution; vacuum freeze-drying the carbon quantum dot solution to obtain a powdery solid, which is the carbon quantum dots having the controllable electroluminescent and photoluminescent performances. The method is carried out in a water solution system with the sucrose as a carbon source in an electrochemical manner, wherein different surface passivators are added to the reaction system to control the electroluminescent and fluorescent performances of the carbon quantum dots; in addition, the carbon quantum dots having excellent electroluminescent and fluorescent properties can be obtained without complex subsequent modification treatment, so that the carbon quantum dots has great application value in the fields of fluorescence and electroluminescence, and also has excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a method for preparing carbon quantum dots with adjustable electroluminescence and photoluminescence properties. Background technique [0002] Carbon quantum dots (Carbon quantum dots, CQDs), as a shining new star in the family of carbon nanomaterials, have been extensively studied and applied. Compared with semiconductor quantum dots and traditional organic dyes, CQDs have excellent optical properties, no photobleaching, overcome the shortcomings of organic dyes, such as unstable luminescence and easy photobleaching, and at the same time make up for the shortcomings of high toxicity of semiconductor quantum dots. It has low cytotoxicity and good biocompatibility, and has the advantages of easy surface functionalization. In particular, the unique photoluminescence and electroluminescence properties of carbon quantum dots have shown great application value in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 杨培慧赖志强朱明瑶
Owner JINAN UNIVERSITY
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