Preparation method of carbon quantum dot

A carbon quantum dot and carbon source technology, applied in the field of carbon quantum dot preparation, can solve the problems of complex preparation process, high toxicity of amine source, high processing cost, etc., and achieve the effects of simplified preparation process, low biological toxicity and stable chemical properties

Inactive Publication Date: 2019-05-28
TCL CORPORATION
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a method for preparing carbon quantum dots, which aims to solve the complex preparation process of existing nitrogen-doped carbon quantum dot materials, the high toxicity of amine sources, and the post-treatment cost of waste liquid high technical issues

Method used

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preparation example Construction

[0011] On the one hand, the embodiment of the present invention provides a method for preparing carbon quantum dots, comprising the following steps:

[0012] S01: Provide sugar carbon source and ammonium salt;

[0013] S02: Conduct a solid-phase reaction of the mixed material including the carbohydrate carbon source and the ammonium salt at a reaction environment temperature ≥ 120° C. and under airtight conditions.

[0014] In the process of the preparation method of carbon quantum dots provided by the embodiment of the present invention, sugar is used as a carbon source, and is carbonized in a high temperature (≥120° C.) environment to obtain carbon quantum dots, forming a carbon skeleton of carbon quantum dot materials; and As a nitrogen source, ammonium salt is thermally decomposed under high temperature conditions to produce ammonia gas molecules. In this way, ammonia gas molecules react with carbon quantum dots under high temperature and high pressure, and finally form ni...

Embodiment 1

[0029] (1) Synthesis of nitrogen-doped carbon quantum dots

[0030] Add 1.5g of glucose and 5g of ammonium carbonate into a mortar, grind evenly, and transfer to a 100ml autoclave, put 30g of calcium oxide into a 30ml crucible, carefully transfer to a 100ml autoclave, and tighten the autoclave. Next, the high-pressure reactor was placed in a blast drying oven, and the temperature was rapidly raised to a reaction environment temperature of 130° C., and the reaction environment temperature was kept at a constant temperature for 3 hours. After the reaction, the autoclave was taken out of the blast drying oven, and cooled to room temperature naturally, and the crucible with the water-absorbing agent and the brown-black reaction product were taken out.

[0031] (2) Purification and collection of nitrogen-doped carbon quantum dots

[0032]The brown-black powder was taken out from the autoclave, and transferred to a 100ml beaker, and 50ml of deionized water was added. Place the bea...

Embodiment 2

[0034] (1) Synthesis of nitrogen-doped carbon quantum dots

[0035] Add 1.5g of starch and 5g of ammonium carbonate into a mortar, grind evenly, and transfer to a 100ml autoclave, put 30g of calcium oxide into a 30ml crucible, carefully transfer to a 100ml autoclave, and tighten the autoclave. Next, the high-pressure reactor was placed in a blast drying oven, and the temperature was rapidly raised to a reaction environment temperature of 160° C., and the reaction environment temperature was maintained at a constant temperature for 3 hours. After the reaction, the autoclave was taken out of the blast drying oven, and cooled to room temperature naturally, and the crucible with the water-absorbing agent and the brown-black reaction product were taken out.

[0036] (2) Purification and collection of nitrogen-doped carbon quantum dots

[0037] The brown-black powder was taken out from the autoclave, and transferred to a 100ml beaker, and 50ml of deionized water was added. Place t...

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Abstract

The invention belongs to the technical field of quantum dots, and particularly relates to a preparation method of a carbon quantum dot. The preparation method of the carbon quantum dot comprises the following steps of providing saccharide carbon sources and ammonia salt; performing solid-phase reaction on the mixture of saccharide carbon sources and ammonia salt under the sealing condition at thereaction environment temperature higher than or equal to 120 DEG C. The preparation method of the carbon quantum dot has the advantages that the organic amine is not used as the nitrogen source, but the ammonia salt is used as the nitrogen source, so that the biological toxicity is low, the emission of waste liquid is avoided, the production cost is low, the operation is simple, the preparation technology of the material is simplified, and the hazard of raw material is decreased. The obtained nitrogen-doped carbon quantum dot material has the advantages that the Cd (cadmium), Te (tellurium) and other heavy metals are not contained; compared with the traditional quantum dot material, the application field is broader.

Description

technical field [0001] The invention belongs to the technical field of quantum dots, and in particular relates to a preparation method of carbon quantum dots. Background technique [0002] Due to its unique optical properties, quantum dot materials are considered to have a wide range of applications 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 above two aspects limit the application and development of quantum dot materials. [0003] In recent years, various environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
Inventor 丘洁龙
Owner TCL CORPORATION
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