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Preparation method for nitrogen-doped carbon quantum dot

A nitrogen-carbon quantum and amino acid technology is applied in the field of preparation of nitrogen-doped carbon quantum dots, which can solve the problems of strong toxicity and harsh conditions, and achieve the effects of simple preparation method, mild reaction conditions, and strong operability and repeatability.

Inactive Publication Date: 2014-11-26
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a method for preparing nitrogen-doped carbon quantum dots, which solves the problems of harsh conditions and strong toxicity in the existing preparation methods

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of nitrogen-doped carbon quantum dots, comprising:

[0023] Step S1: 0.6g of glucose and 0.3g of glycine were prepared into 30ml of a mixed solution, and the solvent was deionized water.

[0024] Step S2: Transfer 30 ml of the glucose and glycine mixed solution prepared above to a stainless steel reaction kettle with a polytetrafluoroethylene liner, and heat in an oven at a reaction temperature of 130° C. and a reaction time of 60 minutes. There is no precise requirement for the ratio of glucose to glycine in this step.

[0025] Step S3: After the reaction is completed, filter the cooled product with a filter membrane with a pore size of 0.22 μm, and then dialyze the filtrate with a dialysis bag with a molecular cutoff of 1000 for 1 day.

[0026] Step S4: After the dialysis is completed, the liquid in the dialysis bag is frozen to obtain nitrogen-doped carbon quantum dots.

[0027] The carbon quantum dots prepared above have a size of 2 to 3 nanom...

Embodiment 2

[0029] A preparation method of nitrogen-doped carbon quantum dots, comprising:

[0030] Step S1: 0.6g of xylose and 0.3g of glycine were prepared into 30ml of a mixed solution, and the solvent was deionized water.

[0031] Step S2: Transfer 30 ml of the xylose and glycine mixed solution prepared above to a stainless steel reaction kettle with a polytetrafluoroethylene liner, and heat in an oven at a reaction temperature of 130° C. and a reaction time of 60 minutes. There is no precise requirement for the ratio of glucose to glycine in this step.

[0032] Step S3: After the reaction is completed, filter the cooled product with a filter membrane with a pore size of 0.22 μm, and then dialyze the filtrate with a dialysis bag with a molecular cutoff of 1000 for 1 day.

[0033] Step S4: After the dialysis is completed, the liquid in the dialysis bag is frozen to obtain nitrogen-doped carbon quantum dots.

[0034] The aforementioned quantum yield was 2.99%.

Embodiment 3

[0036] A preparation method of nitrogen-doped carbon quantum dots, comprising:

[0037] Step S1: 0.6g of sucrose and 0.3g of glycine were prepared into 30ml of mixed solution, and the solvent was deionized water.

[0038] Step S2: Transfer 30 ml of the above-prepared sucrose and glycine mixed solution to a stainless steel reaction kettle with a polytetrafluoroethylene liner, and heat in an oven at a reaction temperature of 130° C. for 60 minutes. There is no precise requirement for the ratio of glucose to glycine in this step.

[0039] Step S3: After the reaction is completed, filter the cooled product with a filter membrane with a pore size of 0.22 μm, and then dialyze the filtrate with a dialysis bag with a molecular cutoff of 1000 for 1 day.

[0040] Step S4: After the dialysis is completed, the liquid in the dialysis bag is frozen to obtain nitrogen-doped carbon quantum dots.

[0041] The aforementioned quantum yield was 3.97%.

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Abstract

The invention provides a preparation method for a nitrogen-doped carbon quantum dot. The method includes: reacting water soluble amino acid, peptide or protein and a soluble sugar solution at 130-180DEG C in a stainless steel reaction kettle with a polytetrafluoroethylene liner, performing cooling at the end of reaction, then conducting filtration and dialysis, and performing drying to obtain the nitrogen-doped carbon quantum dot. The preparation method provided by the invention is simple, has the characteristics of mild reaction conditions, and strong operability and repeatability, reaction can occur at 130-180DEG C, no more condition restrictions exist, and the employed raw materials are environment-friendly. Specifically, the carbon quantum dot prepared from glucose and glycine has a size of 2-3 nanometers and yield of 76.0%, and the quantum yield is 13.8%. With a fluorescence quenching effect on iron ions, the nitrogen-doped carbon quantum dot can be used for the sensing field.

Description

technical field [0001] The invention relates to the technical field of quantum dot preparation, in particular to a method for preparing nitrogen-doped carbon quantum dots. Background technique [0002] In recent years, with the development of the field of fluorescent nanomaterials, new quantum dot materials have sprung up, which has also caused a great impact on the traditional field of quantum dots. For example, traditional semiconductor quantum dots (such as cadmium selenide and cadmium telluride) have harsh preparation conditions (such as isolation from air), strong toxicity (a large amount of heavy metals are used in the preparation), and poor biocompatibility (usually need to contain A layer of protective film, such as silicon dioxide, can be used in the biological field), these shortcomings greatly reduce the application in the field of living organisms. [0003] Carbon quantum dots are a new kind of nano-fluorescent material that has emerged in recent years. Compared...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00
Inventor 翁雪香赖天天郑恩惠曹庆雪
Owner ZHEJIANG NORMAL UNIVERSITY
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