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Carbon quantum dot composite nanoparticles, and carbon quantum dot/fluoride composite material, preparation method and applications thereof

A technology of composite nanoparticles and composite materials, applied in the field of new materials, can solve the problems of easy migration of carbon points, low temperature resistance, toxicity, etc., and achieve the effects of easy industrial promotion and production, good high temperature resistance performance, and stable composite materials.

Active Publication Date: 2019-01-01
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon dots themselves are mostly water-soluble, not resistant to high temperature, and the composite effect with polymer materials is not good, which limits their research and application in new materials.
Some researchers compound carbon dots on mesoporous silica, but the carbon dots are compounded in the pores, and the carbon dots on the surface are easy to migrate; at the same time, the current synthesis is generally by two-step method, and the carbon dots and mesoporous silica need to be synthesized separately first. Porous silica material, and then compound the two by physical adsorption
[0004] Therefore, it is urgent to solve technical problems such as single effect, toxicity, and complex synthesis methods of current materials, and it is also urgent to expand and develop new carbon dot composite materials.

Method used

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  • Carbon quantum dot composite nanoparticles, and carbon quantum dot/fluoride composite material, preparation method and applications thereof
  • Carbon quantum dot composite nanoparticles, and carbon quantum dot/fluoride composite material, preparation method and applications thereof
  • Carbon quantum dot composite nanoparticles, and carbon quantum dot/fluoride composite material, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 Preparation of CDs@CaF 2 composite nanoparticles

[0051] 1. Preparation of fluorescent carbon dots

[0052]Weigh 1g of anhydrous citric acid and dissolve it in 30mL of deionized water, add 1.6mL of ethylenediamine (the mass ratio of anhydrous citric acid to ethylenediamine is 1:1.6), mix well and carry out hydrothermal reaction in an oven at 200°C for 5h , after natural cooling, the reaction solution was taken out, dialyzed at 1000D for 24 hours, the solution in the bag was distilled under reduced pressure and freeze-dried to obtain solid carbon dots (CDs), which were configured into an aqueous solution of carbon dots with a concentration of 0.5 mg / mL for future use.

[0053] 2. CDs@CaF 2 Preparation of Composite Nanoparticles

[0054] Select 11g of anhydrous calcium chloride and 4g of ammonium fluoride as raw materials, add water respectively according to the molar ratio of the two to 1:1.1 to prepare 20mL of solutions A and B for use, and part of the sol...

Embodiment 2

[0060] Example 2 Preparation of CDs@CaF 2 composite nanoparticles

[0061] 1. Preparation of fluorescent carbon dots

[0062] Weigh 1g of anhydrous citric acid and dissolve it in 30mL of deionized water, add 1.6mL of ethylenediamine (the mass ratio of anhydrous citric acid to ethylenediamine is 1:1.6), mix well and carry out hydrothermal reaction in an oven at 200°C for 10h , after natural cooling, the reaction solution was taken out, dialyzed at 1000D for 24 hours, the solution in the bag was distilled under reduced pressure and freeze-dried to obtain solid carbon dots (CDs), which were configured into an aqueous solution of carbon dots with a concentration of 0.5 mg / mL for future use.

[0063] 2. CDs@CaF 2 Preparation of Composite Nanoparticles

[0064] Select 11g of anhydrous calcium chloride and 5.5g of ammonium fluoride as raw materials, and add water respectively according to the molar ratio of the two to 1:1.5 to prepare 20mL of solutions A and B for use, wherein par...

Embodiment 3

[0065] Example 3 Preparation of CDs@CaF 2 composite nanoparticles

[0066] 1. Preparation of Carbon Dots

[0067] Weigh 1g of anhydrous citric acid and dissolve it in 30mL of deionized water, add 1.6mL of ethylenediamine (the mass ratio of anhydrous citric acid to ethylenediamine is 1:1.6), mix well and carry out hydrothermal reaction in an oven at 200°C for 7h , after natural cooling, the reaction solution was taken out, dialyzed at 1000D for 24 hours, the solution in the bag was distilled under reduced pressure and freeze-dried to obtain solid carbon dots (CDs), which were configured into an aqueous solution of carbon dots with a concentration of 0.5 mg / mL for future use.

[0068] 2. CDs@CaF 2 Preparation of Composite Nanoparticles

[0069] Select 11g of anhydrous calcium chloride and 7.5g of ammonium fluoride as raw materials, and add water at a molar ratio of 1:2 to prepare 20mL each of solutions A and B for use. Part of the solvent in solution A is 10mL of 0.5mg / mL car...

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Abstract

The invention provides carbon quantum dot composite nanoparticles, and a carbon quantum dot / fluoride composite material, a preparation method and applications thereof, wherein carbon quantum dots arecompounded into the interior of fluoride crystals in carbon quantum dot / fluoride composite nanoparticles, such that the carbon quantum dots can achieve the advantages of solid-state light emitting, notoxicity, high-temperature resistance, decomposition resistance and good stability, and can absorb UV and be converted into blue light required for plants. The invention further provides a one-step preparation scheme of the carbon quantum dot / fluoride composite nanoparticles, wherein the one-step preparation scheme has characteristics of simple process and low cost, and is suitable for industrialproduction. The invention further provides a carbon quantum dot / fluoride / polymer composite material, which compounds the carbon quantum dot / fluoride nanoparticles and a polymer material, has high transparency, and further has light conversion, toughening or anti-aging effect, wherein the preparation method is simple and easy-performing, can be used for the preparation of agricultural films or rubber products, and has good industrialization prospect.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a carbon dot composite nano particle, a carbon dot / fluoride composite material, a preparation method and an application. Background technique [0002] Most of the existing materials have single light conversion, toughening or anti-aging effects, and they face problems such as high cost, high toxicity, complex reaction conditions, and environmental pollution. For example, the current light conversion agents are mostly rare earth-based doped fluorescent materials, but due to the limited rare earth resources on the earth, such materials are expensive, and the average market price per gram of rare earth metals is thousands of yuan; at the same time, rare earth-based doped fluorescent materials The synthesis conditions of materials are complicated, and high-temperature solid-state reactions are often required. The existing UV absorbers mainly include salicylates, benzophenone...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K3/16C08L23/06C08L63/00C08L9/06C08J5/18
Inventor 刘应亮孙宇琼胡广齐胡超凡雷炳富庄健乐张学杰
Owner SOUTH CHINA AGRI UNIV
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