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Method of preparing water-soluble nitrogen-doped carbon quantum dot

A carbon quantum dot, nitrogen doping technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of continuous and large-scale production of fluorescent carbon quantum dots, non-renewable energy, The problem of low carbon quantum yield, etc., to achieve the effect of rich carbon source, high quantum yield and good water solubility

Inactive Publication Date: 2017-09-22
GUANGXI TEACHERS EDUCATION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method often requires strict experimental conditions and special energy sources, the cost is high, and the obtained carbon quantum yield is relatively low
Bottom-up synthesis method, that is, direct synthesis of fluorescent carbon quantum dots by pyrolysis or carbonization of suitable precursors, methods include: combustion method, hydrothermal carbonization method, ultrasonic method, etc., but these methods are often used Non-renewable energy and requires strict post-processing, so it is not conducive to continuous and large-scale production of fluorescent carbon quantum dots

Method used

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  • Method of preparing water-soluble nitrogen-doped carbon quantum dot
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  • Method of preparing water-soluble nitrogen-doped carbon quantum dot

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Embodiment 1

[0029] A preparation method of water-soluble nitrogen-doped carbon quantum dots, comprising the following steps:

[0030] Step 1. Dissolve 1.0g of citric acid in 20mL of ultrapure water to prepare precursor solution I, and dissolve 0.1g of p-aminobenzamide in 20mL of ultrapure water to prepare precursor solution II, with a volume ratio of 1:1 Evenly mix the precursor solution I and the precursor solution II to obtain a mixed solution;

[0031] Step 2. Stir the mixed solution prepared in step 1 evenly, put it into the polytetrafluoroethylene liner of the hydrothermal synthesis reaction kettle, and then place the hydrothermal synthesis reaction kettle in a constant temperature box for heating to obtain a light yellow solution. The temperature of the incubator is 160°C, and the reaction time is 4h;

[0032] Step 3, filter the light yellow solution obtained in step 2 to obtain the filtrate, then dialyze the filtrate, use a dialysis bag with a shear molecular weight of 1000, dialy...

Embodiment 2

[0034] A preparation method of water-soluble nitrogen-doped carbon quantum dots, comprising the following steps:

[0035] Step 1. Dissolve 1.0g of citric acid in 20mL of ultrapure water to prepare precursor solution I, and dissolve 0.1g of p-aminobenzamide in 20mL of ultrapure water to prepare precursor solution II, with a volume ratio of 2:1 Evenly mix the precursor solution I and the precursor solution II to obtain a mixed solution;

[0036] Step 2. Stir the mixed solution prepared in step 1 evenly, put it into the polytetrafluoroethylene liner of the hydrothermal synthesis reaction kettle, and then place the hydrothermal synthesis reaction kettle in a constant temperature box for heating to obtain a light yellow solution. The temperature of the incubator is 160°C, and the reaction time is 4h;

[0037] Step 3, filter the light yellow solution obtained in step 2 to obtain the filtrate, then dialyze the filtrate, use a dialysis bag with a shear molecular weight of 1000, dialy...

Embodiment 3

[0039] A preparation method of water-soluble nitrogen-doped carbon quantum dots, comprising the following steps:

[0040] Step 1. Dissolve 1.0g of citric acid in 20mL of ultrapure water to prepare precursor solution I, and dissolve 0.1g of p-aminobenzamide in 20mL of ultrapure water to prepare precursor solution II, with a volume ratio of 4:1 Evenly mix the precursor solution I and the precursor solution II to obtain a mixed solution;

[0041] Step 2. Stir the mixed solution prepared in step 1 evenly, put it into the polytetrafluoroethylene liner of the hydrothermal synthesis reaction kettle, and then place the hydrothermal synthesis reaction kettle in a constant temperature box for heating to obtain a light yellow solution. The temperature of the incubator is 160°C, and the reaction time is 4h;

[0042] Step 3, filter the light yellow solution obtained in step 2 to obtain the filtrate, then dialyze the filtrate, use a dialysis bag with a shear molecular weight of 1000, dialy...

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Abstract

The invention discloses a preparation method of water-soluble nitrogen-doped carbon quantum dots, comprising the following steps: Step 1, dissolving citric acid in ultrapure water to prepare precursor solution I, dissolving p-aminobenzamide in Prepare precursor solution II in pure water, uniformly mix precursor solution I and precursor solution II at a volume ratio of 1 to 10:1 to obtain a mixed solution; step 2, perform hydrothermal reaction on the mixed solution prepared in step 1, Water-soluble nitrogen-doped carbon quantum dots can be obtained. The invention adopts a one-step hydrothermal method to prepare water-soluble nitrogen-doped carbon quantum dots. The carbon source is rich and cheap, the preparation process is simple, the whole preparation process is pollution-free, non-toxic, green and environmentally friendly, and can be prepared in large quantities.

Description

technical field [0001] The invention relates to the field of preparation of nanometer materials. More specifically, the present invention relates to a method for preparing water-soluble nitrogen-doped carbon quantum dots. Background technique [0002] In recent years, fluorescent carbon nanomaterials have attracted extensive research by researchers because of their good optical properties and low cytotoxicity. It has good photostability and no toxic side ions, is suitable for long-term detection and tracing experiments, and has broad application prospects in biomarkers and analysis and detection. Carbon quantum dots (CQDs) exhibit excellent properties such as hydrophilicity, low cytotoxicity, chemical and photostability, etc., which have attracted extensive attention and applications in the fields of chemistry, biomedicine, sensing and optoelectronics. [0003] There are currently two main methods for preparing carbon quantum dots: top-down method and bottom-up method. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00
CPCC09K11/65B82Y20/00B82Y30/00
Inventor 黄珊肖琦杨二利刘义
Owner GUANGXI TEACHERS EDUCATION UNIV
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