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Preparation method of doped carbon nitride fluorescent quantum dots

A technology of fluorescent quantum dots and carbon nitride, which is applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve the limitation of mass production and wide application of carbon nitride quantum dots, and the size uniformity of quantum dots is not very ideal , low yield of quantum dots and other issues, to achieve the effect of small particle size, increased fluorescence luminescence intensity and fluorescence quantum yield, and uniform particle size distribution

Inactive Publication Date: 2016-06-15
SHANDONG AGRICULTURAL UNIVERSITY
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Problems solved by technology

In the preparation method of reported carbon nitride quantum dots, the preparation of quantum dots is usually prepared by exfoliation in aqueous solution, the size uniformity of quantum dots is not very ideal, and the size range is relatively large (5-80nm), and the yield of quantum dots It is also low, which limits the mass production and wide application of carbon nitride quantum dots

Method used

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  • Preparation method of doped carbon nitride fluorescent quantum dots
  • Preparation method of doped carbon nitride fluorescent quantum dots
  • Preparation method of doped carbon nitride fluorescent quantum dots

Examples

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Embodiment 1

[0025] Weigh 1.0 g of melamine and 0.2 g of ammonium fluoride in a mass ratio of 5:1, add the melamine and ammonium fluoride to a mortar and grind and mix them. Put it into a crucible, calcine in a tube furnace at 550°C and keep it for 2 hours to obtain fluorine-doped carbon nitride powder material.

[0026] Put the prepared doped carbon nitride powder material into a centrifuge tube, add analytically pure ethylene glycol solution as a solvent, and add 1 g of doped carbon nitride powder per liter of ethylene glycol solution. The centrifuge tube was placed in an ultrasonic cleaning machine and ultrasonically broken for 5 hours at a power of 160 W, and the supernatant was taken and placed in a high-speed centrifuge at a centrifugal speed of 12000 rpm for 10 minutes to obtain a solution of highly fluorescent doped carbon nitride quantum dots. The above solution is placed in an oven at 60° C. and dried to constant weight to obtain fluorine-doped carbon nitride quantum dots. Such as ...

Embodiment 2

[0028] Weigh 1.0g of melamine and B at a mass ratio of 20:1 2 O 3 0.05g, combine melamine and B 2 O 3 Add to mortar and grind and mix well. Put it into a crucible, calcine in a tube furnace at 500° C. and keep it for 4 hours to obtain boron-doped carbon nitride powder material.

[0029] Put the prepared doped carbon nitride powder material into a centrifuge tube, and add analytical pure glycol solution as a solvent. Add 10g of doped carbon nitride powder per liter of ethylene glycol solution. The centrifuge tube was placed in an ultrasonic cleaning machine and ultrasonically broken at 170 W for 2 hours, and the supernatant was placed in a high-speed centrifuge at a centrifugal speed of 12000 rpm for 10 minutes to obtain a solution of highly fluorescent doped carbon nitride quantum dots. The above solution is placed in an oven at 60° C. and dried to a constant weight to obtain boron-doped carbon nitride quantum dots. The particle size is 3-4nm. The fluorescence quantum yield is...

Embodiment 3

[0031] Weigh 1.0 g of melamine and 0.2 g of thiourea according to a mass ratio of 5:1, add the melamine and thiourea into a mortar, grind and mix. Put it into a crucible, calcine in a tube furnace at 550°C and keep it for 4 hours to obtain sulfur-doped carbon nitride powder material.

[0032] Put the prepared sulfur-doped carbon nitride powder material into a centrifuge tube, and add analytically pure glycerol solution as a solvent. Add 5g of doped carbon nitride powder per liter of pure glycerol solution. The centrifuge tube was placed in an ultrasonic cleaner and ultrasonically broken for 5 hours at a power of 160W. Take the supernatant and place it in a high-speed centrifuge at a centrifugal speed of 12000 rpm for 10 minutes to obtain a solution of highly fluorescent doped carbon nitride quantum dots. The above solution is placed in an oven at 80° C. and dried to a constant weight to obtain sulfur-doped carbon nitride quantum dots. The particle size is 2-3nm. The fluoresce...

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Abstract

The invention relates to a preparation method of doped carbon nitride fluorescent quantum dots.According to the preparation method, melamine and compounds corresponding to doped atoms serve as raw materials, while melamine molecules are roasted to form a carbon nitride structure, the doped atoms enter the carbon nitride structure through a chemical reaction, a doped carbon nitride block material is formed, and the block material is subjected to ultrasound crushing in an alcohol solvent to prepare the doped carbon nitride fluorescent quantum dots which are uniform in quantum size and grain size.The dried quantum dots are good in water solubility and dispersibility and have high fluorescent quantum dot yield.The method can be used for preparing the doped carbon nitride quantum dots in batches, the synthesis method is simple, and repeatability is good.The synthesized quantum dots have wide application prospects in the fields of fluorescence detection, light-emitting devices, biological marking and the like.

Description

Technical field [0001] The invention relates to a preparation method of doped carbon nitride fluorescent quantum dots, belonging to the field of material preparation. Background technique [0002] The excellent optical properties and special small size effects of fluorescent quantum dots have attracted widespread attention. As a new type of biomarker, fluorescent quantum dots overcome many shortcomings such as poor stability of organic dyes and prone to fluorescent bleaching. They are used in the fields of biomolecules (DNA, protein enzymes, etc.), cell labeling, fluorescent in vivo imaging, and early diagnosis of cancer cells. Wide application prospects. Therefore, the development of new fluorescent quantum dots with high stability and high fluorescence quantum yield has become one of the important research directions in materials science, analytical science and biology. [0003] The most studied fluorescent quantum dots are semiconductor quantum dots. However, traditional semi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/70B82Y40/00
CPCB82Y40/00C09K11/0883C09K11/65C09K11/70
Inventor 范海艾仕云王楠韩振威
Owner SHANDONG AGRICULTURAL UNIVERSITY
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