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Carbon nitride powder preparation method, and carbon nitride quantum dots and preparation method thereof

A technology of carbon nitride and quantum dots, applied in chemical instruments and methods, nitrogen compounds, nitrogen and non-metallic compounds, etc., can solve the problems of low quantum yield, achieve good water solubility, stable optical properties, and expand application fields Effect

Inactive Publication Date: 2019-02-26
TCL CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing carbon nitride powder, a carbon nitride quantum dot and its preparation method, aiming to solve the problem of low quantum yield of existing carbon nitride quantum dot materials

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  • Carbon nitride powder preparation method, and carbon nitride quantum dots and preparation method thereof

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preparation example Construction

[0017] An embodiment of the present invention provides a method for preparing carbon nitride powder, the carbon nitride quantum dots are carbon nitride quantum dots, and the preparation method includes the following steps:

[0018] S01. Provide a cyanamide compound and a phenyl modifier, add the cyanamide compound and the phenyl modifier to the first solvent and mix them, and mix them at 50-90°C to obtain an emulsion; Centrifuge to obtain precursor powder;

[0019] S02. Calcining the precursor powder at 350-600° C. for 1-3 hours under an inert gas flow condition to obtain carbon nitride powder.

[0020] Further, the embodiment of the present invention provides a method for preparing carbon nitride quantum dots. After the carbon nitride powder is prepared by using the method for preparing carbon nitride powder including the steps S01 and S02, the steps further include:

[0021] S03. adding the carbon nitride powder into a second solvent, ultrasonically peeling off the carbon n...

Embodiment 1

[0044] A preparation method of carbon nitride quantum dots, the carbon nitride quantum dots are carbon nitride quantum dots, the preparation method comprising the following steps:

[0045] S11. Add 2.52g of melamine and 3.74g of benzoguanamine into a 250mL three-necked flask, add 100mL of deionized water and heat to 60°C, stir at 1000rpm for 12h, cool to obtain a milky reaction solution. The reaction solution was centrifuged at 5000 rpm for 10 min to obtain a white substance. After repeated washing with deionized water and centrifugation twice, the white substance was transferred to a vacuum oven at 60° C. to obtain a precursor powder.

[0046] S12. Put the above precursor powder in a tubular muffle furnace, raise the temperature to 450° C. and keep the temperature constant for 2 hours under the condition of nitrogen flow, the nitrogen flow rate is 100 mL / min, and obtain light yellow carbon nitride powder material after cooling. Wherein, the heating rate of the muffle furnace ...

Embodiment 2

[0050] A kind of preparation method of carbon nitride quantum dot, described carbon nitride quantum dot is carbon nitride quantum dot, and its preparation method comprises the following steps, and its flow chart is as follows figure 1 Shown:

[0051] S21. Add 2.52g of melamine, 3.74g of benzoguanamine, and 1.26g of barbituric acid into a 250mL three-necked flask, add 100mL of deionized water and heat to 60°C, stir at 1000rpm for 12h, cool to obtain a milky reaction solution. The reaction solution was centrifuged at 5000 rpm for 10 min to obtain a white substance. After repeated washing with deionized water and centrifugation twice, the white substance was transferred to a vacuum oven at 60° C. to obtain a precursor powder.

[0052] S22. Put the above precursor powder in a tubular muffle furnace, raise the temperature to 450° C. and keep the temperature constant for 2 hours under the condition of nitrogen flow, the nitrogen flow rate is 100 mL / min, and obtain light yellow carbo...

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Abstract

The invention provides a carbon nitride quantum dot preparation method, wherein the carbon nitride quantum dot is carbon nitride quantum dot. The preparation method comprises: providing a cyanamide compound and a phenyl modifier, adding a first solvent, mixing, carrying out stirring treatment at a temperature of 50-90 DEG C, and carrying out a constant temperature reaction to obtain a milky liquid; carrying out first centrifugal separation on the milky liquid to obtain precursor powder; placing the precursor powder in a reaction container, heating to a temperature of 350-600 DEG C by introducing an inert gas flow, and carrying out constant temperature treatment for 1-3 h to obtain carbon nitride powder; and adding a second solvent to the carbon nitride powder, ultrasonically stripping, carrying out second centrifugal separation, and drying the obtained supernatant to obtain the carbon nitride quantum dots.

Description

technical field [0001] The invention belongs to the technical field of quantum dot synthesis, and in particular relates to a preparation method of carbon nitride powder, a carbon nitride quantum dot and a preparation method thereof. Background technique [0002] Due to their unique optical properties, quantum dot materials are widely used in optoelectronic displays, medical monitoring, biosensors and other fields, and have become a research hotspot. However, on the one hand, traditional quantum dot materials contain heavy metal elements such as Cd and Te, which are not only expensive, but also have strong biological toxicity; on the other hand, traditional quantum dot materials need to strictly control the moisture content of the system during the preparation process. And oxygen content, which puts strict requirements on the synthesis equipment and process of quantum dot materials. The deficiencies in the above two aspects of traditional quantum dot materials limit the appl...

Claims

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Application Information

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IPC IPC(8): C01B21/082B82Y30/00
CPCB82Y30/00C01B21/0605
Inventor 丘洁龙
Owner TCL CORPORATION
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