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Preparation method and applications of amino carbon quantum dots

A technology of aminocarbon quantum and carbon quantum dots, which is applied in the fields of chemistry and nanomaterial science, can solve the problems of difficult large-scale production promotion, cumbersome process steps, and human health pollution, and achieves easy promotion, simple preparation process equipment, and low cost Effect

Inactive Publication Date: 2012-07-25
SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional semiconductor quantum dots are composed of highly toxic metal elements, so they have insurmountable defects, and human health and environmental pollution issues have always been of concern, thus limiting their wide application.
At present, there are many preparation methods for carbon quantum dots, and most of the prepared carbon quantum dots are modified by carboxyl groups; Certain fluorescent properties lead to low reaction yields, making it difficult to scale production and promotion

Method used

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  • Preparation method and applications of amino carbon quantum dots
  • Preparation method and applications of amino carbon quantum dots
  • Preparation method and applications of amino carbon quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: 0.5g glucosamine powder is put into the beaker of 100mL specification, injects 30ml concentration and is the Na of 10mmol / L in the beaker again 2 HPO 4 -NaH 2 PO 4 Aqueous solution (PH7.4), magnetically stirred at room temperature (15-25°C), until the glucosamine is fully dissolved to obtain a uniform transparent solution; put the beaker in the center of the turntable in a household mechanical microwave oven, use 700W power, to transparent The solution was subjected to microwave radiation for 2 minutes to obtain a brownish-yellow solution containing carbon quantum dots. After the solution was naturally cooled, it was injected into a dialysis bag (molecular weight cut-off 500D) for dialysis for 72 hours, and the water was changed every 12 hours. Most of the dialysis products were removed by rotary evaporation. water to obtain a concentrated solution. The obtained concentrated solution was freeze-dried at -50°C to finally obtain carbon quantum dots with a...

Embodiment 2

[0023] Embodiment 2: 0.5g glucosamine powder is put into the 100mL beaker, then in the beaker, inject 30ml concentration and be the Na of 20mmol / L 2 HPO 4 -NaH 2 PO 4 Aqueous solution (pH7.4), magnetically stirred at room temperature, until the glucosamine is fully dissolved to obtain a uniform transparent solution; place the beaker in the center of the turntable in a household mechanical microwave oven, and use 700W power to irradiate the transparent solution with microwaves for 2 minutes. Obtain a brown-red solution containing carbon quantum dots. After the solution is naturally cooled, it is poured into a dialysis bag (molecular weight cut-off 500D) for dialysis for 72 hours, and the water is changed every 12 hours. Most of the water is removed from the dialysis product by rotary evaporation to obtain a concentrated solution. The obtained concentrated solution was freeze-dried at -50°C to finally obtain carbon quantum dots with amino groups on the surface, the yield was a...

Embodiment 3

[0024] Embodiment 3: 0.5g glucosamine powder is put into 100mL beaker, inject 30ml concentration in beaker again and be the Na of 50mmol / L 2 HPO 4 -NaH 2 PO 4 Aqueous solution (PH7.4), magnetically stirred at room temperature, until the glucosamine is fully dissolved to obtain a uniform transparent solution; place the beaker in the center of the turntable in a household mechanical microwave oven, and use 700W power to irradiate the transparent solution with microwaves for 2 minutes. A brown solution containing carbon quantum dots was obtained. After the solution was naturally cooled, it was poured into a dialysis bag (MWCO 500D) for dialysis for 72 hours, and the water was changed every 12 hours. Most of the water was removed from the dialysis product by rotary evaporation to obtain a concentrated solution. The obtained concentrated solution was freeze-dried at -50°C to finally obtain carbon quantum dots with amino groups on the surface, with a yield of about 17%, a particle...

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Abstract

The invention discloses a microwave-assisted method for preparing carbon quantum dots rich in amino groups on the surfaces thereof and application of the amino carbon quantum dots. The method comprises the following steps: using aqueous solution of glucosamine phosphate as a raw material, heating the raw material with a microwave oven as a reaction platform to obtain carbon quantum dots with fluorescent properties, and removing residues and moisture by dialysis and rotary evaporation to obtain carbon quantum dot powder. The method provided by the invention for preparing amino carbon quantum dots is simple in operation and easy in generalization, has low cost, high yield, simple preparation process and equipment, and can complete the operation in a very short time. The obtained carbon quantum dots are rich in amino groups on the surfaces thereof and soluble in water, the fluorescence quantum yield is greatly increased, and the carbon quantum dots are successfully used for labeling living cells, therefore the method has broad application prospects.

Description

technical field [0001] The invention relates to the fields of chemistry and nanometer material science, in particular to a preparation method and application of amino carbon quantum dots. Background technique [0002] Quantum dots (Quantum Dots, QDs), usually refers to semiconductor nanocrystals with a radius smaller than or close to the laser Bohr radius, and are nanometer-sized particles with unique optical and electrical properties. As a nano-fluorescent material, compared with traditional organic dye molecules, it has the advantages of strong photochemical stability, wide excitation spectrum, continuous distribution, and adjustable luminescent color. It is used in light-emitting devices, biomarkers, biodetections and biosensors fields have application value. However, traditional semiconductor quantum dots are composed of highly toxic metal elements, so they have insurmountable defects, and human health and environmental pollution issues have been of great concern, thus ...

Claims

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Application Information

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IPC IPC(8): C09K11/65A61K49/00
Inventor 刘长军田丰李钒杨建张彦军
Owner SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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