Nitrogen-doped carbon quantum dot green fluorescent material, and preparation method thereof

A technology of carbon quantum dots and green fluorescence, which is applied in the field of nitrogen-doped carbon quantum dot green fluorescent materials and its preparation, can solve problems such as adverse human health and unpleasant odors, shorten synthesis time, maintain stable luminescent performance, The effect of reducing the synthesis cost

Active Publication Date: 2019-11-19
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because most of the sulfur-containing compound molecules have an unpleasant smell, it is not good for human health

Method used

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  • Nitrogen-doped carbon quantum dot green fluorescent material, and preparation method thereof
  • Nitrogen-doped carbon quantum dot green fluorescent material, and preparation method thereof
  • Nitrogen-doped carbon quantum dot green fluorescent material, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Green light carbon quantum dots prepared with a reaction time of 2 hours.

[0023] A certain amount of SnCl 4 ·5H 2 O was dissolved in 10-15 mL of isopropanol solution, a certain amount of m-phenylenediamine was dissolved in 10-20 mL of isopropanol, and the two solutions were mixed and transferred to a polytetrafluoroethylene reactor. at 180 o After reacting in C for 2 hours, it was naturally cooled to room temperature. Efficiently luminous green light carbon quantum dots can be obtained through centrifugal separation.

[0024] figure 1 is the emission spectrum of the carbon quantum dots under 462 nm light excitation, and the maximum emission wavelength is located at 500 nm. figure 2 The fluorescence excitation spectrum of the carbon quantum dots is based on the monitoring wavelength of 500 nm, and the maximum excitation wavelength is located at 462 nm. image 3 is the UV-Vis absorption spectrum of the carbon quantum dots, which shows that there are th...

Embodiment 2

[0025] Example 2: Green-light carbon quantum dots prepared with reaction times of 2, 4, 6, and 8 hours respectively.

[0026] A certain amount of SnF 2 Dissolve in 10-15 mL of isopropanol solution, dissolve a certain amount of m-phenylenediamine in 10-20 mL of isopropanol, mix the two solutions and transfer them to a polytetrafluoroethylene reactor, 180 o C was reacted for 2, 4, 6, and 8 hours, respectively, and cooled to room temperature naturally. Green light carbon quantum dots prepared with different reaction times can be obtained by centrifugation. The fluorescence quantum efficiencies of green carbon quantum dots reacted for 2, 4, 6, and 8 hours were 36.3%, 55.8%, 49.7%, and 48.2%, respectively (Table 1).

[0027] Table 1 Quantum efficiency of carbon quantum dots synthesized at different times

[0028] carbon quantum dots 2 hours 4 hours 6 hours 8 hours Fluorescence Quantum Efficiency 36.3% 55.8% 49.7% 48.2%

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Abstract

The invention relates to a nitrogen-doped carbon quantum dot green fluorescent material, and a preparation method thereof. The particle size of the nitrogen-doped carbon quantum dot green fluorescentmaterial ranges from 3 to 5nm; under 270 to 462nm light excitation, the nitrogen-doped carbon quantum dot is capable of emitting bright green fluorescence, the highest fluorescence quantum efficiencyis 55%, the particle size ranges from 3 to 5nm. According to the preparation method, isopropanol is taken as a carbon source, a tin salt is taken as a catalyst, the nitrogen-doped carbon quantum dot synthesis time is shortened greatly, the fluorescence efficiency of the nitrogen-doped carbon quantum dot synthesized in 2h reaches 36%; the performance of the nitrogen-doped carbon quantum dot prepared using the above preparation method is stable in pH range of 4 to 9; the preparation method is capable of simplifying nitrogen-doped carbon quantum dot technology greatly; preparation efficiency is increased; and preparation cost is reduced greatly.

Description

technical field [0001] The invention specifically relates to a nitrogen-doped carbon quantum dot green fluorescent material and a preparation method thereof. Background technique [0002] Carbon quantum dots are a class of spherical nanomaterials with a particle size of less than 10 nm. In addition to the luminescent performance and small size characteristics of traditional quantum dots, carbon quantum dots also have the advantages of good water solubility, stable luminescent performance, good compatibility with biomolecules, and low cost, which make them widely used in bioimaging, biomedical molecules, etc. Luminescence labeling, molecular luminescence sensors and other fields have broad application prospects. [0003] There are many methods for synthesizing carbon quantum dots, such as hydrothermal method and microwave method. However, the currently reported synthesis methods for carbon quantum dots generally have a long reaction time and low quantum efficiency. It is r...

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 安保礼熊慧芳殷长玲
Owner SHANGHAI UNIV
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