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Nitrogen doped carbon quantum dot as well as preparation method and application thereof

A nitrogen-carbon quantum and carbon quantum dot technology, which is applied in the field of nitrogen-doped carbon quantum dots and its preparation, can solve the problems of expensive raw materials and equipment, troublesome operation, low quantum yield, etc., and achieves good solubility, monodispersity, reaction Simple and easy operation, the effect of excellent luminous properties

Inactive Publication Date: 2014-04-30
XIAN YABO BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are many methods for preparing carbon quantum dots, such as laser etching method, electrochemical method, arc discharge method, microwave method, etc., but these methods are very complicated in terms of raw materials and preparation processes, cumbersome to operate, and expensive raw materials and equipment. , the process is cumbersome, the yield is low, and the quantum yield is extremely low (<10%), and further post-processing is often required to obtain carbon quantum dots with high fluorescence yield and good luminescence performance, which also greatly limits the carbon quantum dots. large-scale preparation and wide application

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  • Nitrogen doped carbon quantum dot as well as preparation method and application thereof
  • Nitrogen doped carbon quantum dot as well as preparation method and application thereof
  • Nitrogen doped carbon quantum dot as well as preparation method and application thereof

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Embodiment 1

[0032] At room temperature, prepare 20 mL of citric acid solution with a concentration of 2.0 mol / L, add 5 mg of linear polyethyleneimine (LPEI, M=5050), make the molar ratio of secondary amine: carboxyl group 1:1000, and mix well to obtain Mixed solution; transfer the mixed solution into a hydrothermal reaction kettle and treat at 100°C for 100 hours to obtain a dispersion of nitrogen-doped carbon quantum dots; extract the dispersion of nitrogen-doped carbon quantum dots with acetone, and centrifuge to remove the upper solvent After the waste liquid was dried in vacuum at 120° C. for 8 hours, nitrogen-doped carbon quantum dots were obtained.

[0033] see figure 1 , is the transmission electron micrograph of nitrogen-doped carbon quantum dots synthesized under this condition. Integrating sphere tests showed that the absolute quantum yield of the obtained carbon quantum dots was 47%. In addition, the peaks of C1s and N1s of the corresponding carbon quantum dots were also dete...

Embodiment 2

[0037] At room temperature, prepare 24 mL of tartaric acid solution with a concentration of 5.0 mol / L, add 20 mg of linear polyethyleneimine (LPEI, M=5050) so that the molar ratio of secondary amine: carboxyl group is 1:500, and mix well to obtain a mixed solution transfer the mixed solution into a hydrothermal reaction kettle, and treat at 200°C for 10 hours to obtain a dispersion of nitrogen-doped carbon quantum dots; extract the dispersion of nitrogen-doped carbon quantum dots with alcohol, and centrifuge to remove the upper solvent waste liquid Finally, after vacuum drying at 150° C. for 6 h, nitrogen-doped carbon quantum dots were obtained.

[0038] figure 2 It is a transmission electron microscope photo of the nitrogen-doped carbon quantum dots synthesized under this condition, and the integrating sphere test shows that the absolute quantum yield of the obtained carbon quantum dots is 42.7%.

Embodiment 3

[0040]At room temperature, prepare 30 mL of lactic acid solution with a concentration of 0.2 mmol / L, add 250 mg of linear polyethyleneimine (LPEI, M=5050) so that the molar ratio of secondary amine: carboxyl group is 1000:1, and mix well to obtain a mixed solution Transfer the mixed solution into a hydrothermal reaction kettle, and process it at 300°C for 0.1 hour to obtain a dispersion of nitrogen-doped carbon quantum dots; extract the dispersion of nitrogen-doped carbon quantum dots with alcohol, and centrifuge to remove the upper solvent waste liquid Finally, after vacuum drying at 100° C. for 10 h, nitrogen-doped carbon quantum dots were obtained.

[0041] image 3 It is a transmission electron micrograph of carbon quantum dots synthesized under this condition. Integrating sphere tests show that the absolute quantum yield of the obtained nitrogen-doped carbon quantum dots is 39.8%.

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Abstract

The invention discloses a nitrogen doped carbon quantum dot as well as a preparation method and an application thereof, belonging to the technical field of material science. The preparation method comprises the steps: after mixing organic acid and organic amine, directly performing a hydrothermal reaction to prepare a nitrogen doped carbon quantum dot water dispersion solution, and extracting and drying the nitrogen doped carbon quantum dot water dispersion solution to obtain a nitrogen doped carbon quantum dot solid. The size of the nitrogen doped carbon quantum dot is not more than 10 nm, the nitrogen content is not more than 50 percent, the surface of the nitrogen doped carbon quantum dot contains amino, carboxyl and hydroxyl; and the quantum efficiency is 39.8-50 percent. The preparation method is simple to operate, environment-friendly, low in equipment requirement; and the prepared nitrogen doped carbon quantum dot has excellent light emitting property, and can be widely applied to fields such as photoelectric materials, biological imaging and fluorescence probe.

Description

technical field [0001] The invention belongs to the technical field of material science and relates to a carbon quantum dot and its preparation and application, in particular to a nitrogen-doped carbon quantum dot and its preparation method and application. Background technique [0002] Quantum dot material is a quasi-zero-dimensional nanomaterial, usually referring to a semiconductor nanocrystal whose radius is smaller than the exciton Bohr radius, and has a significant quantum confinement effect. Traditional quantum dots refer to semiconductor quantum dots, which are composed of rare earth elements II-VI and III-V group elements (such as CdS, PbS, CdSe, InAs, InP, etc.). Such quantum dots have high toxicity, high preparation cost and serious environmental pollution, which limit their wide application. In 2004, Professor Walter A. Scrivens of La Carolina State University in the United States accidentally discovered a carbon nanoparticle fluorescent material when preparing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N33/52
Inventor 高彦峰刘晶刘新玲张毅奕任海迎
Owner XIAN YABO BIOTECH
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