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Preparation method of nitrogen doped graphene quantum dots with high dispersion in water phase and application

A technology of graphene quantum dots and nitrogen doping, applied in the field of nanomaterials, can solve problems such as inability to analyze and detect life samples, limit applications, and reduce quantum yields, and achieve dangerous green environmental protection, high quantum yields, and dangerous small effect

Active Publication Date: 2018-05-15
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The NGQDs prepared by this method are dispersed in the acetonitrile phase, which cannot be directly used for the analysis and detection of life samples, thus limiting its application in the field of life sciences.
However, if the quantum dots are transferred from the organic phase to the aqueous phase, the phase transfer process will lead to a large decrease in the quantum yield.

Method used

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  • Preparation method of nitrogen doped graphene quantum dots with high dispersion in water phase and application
  • Preparation method of nitrogen doped graphene quantum dots with high dispersion in water phase and application
  • Preparation method of nitrogen doped graphene quantum dots with high dispersion in water phase and application

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Embodiment 1

[0025] Prepare a 0.1mol / L tetrabutylammonium hydroxide solution, add 20mL of the solution to the electrolytic cell, use a 10 cm high-purity graphite rod as the working electrode, a platinum wire electrode as the counter electrode, and a calomel electrode as the reference electrode to insert into the electrolytic cell ; Use the potentiostatic chronoamperometry to electrolyze the graphite rod, set the operating voltage to 3-5V, and the electrolysis time is 1h; filter the electrolyzed solution 3 times with a filter head with a pore size of 0.22 μm; then put the filtrate into a dialysis bag (with a cut-off of 3500Da), dialyze for 48 hours, and change the water every 12 hours to obtain highly dispersed nitrogen-doped graphene quantum dots in the water phase with a concentration of 0.1 mg / mL.

Embodiment 2

[0027] Prepare a 0.1mol / L tetrabutylammonium hydroxide solution, add 20mL of the solution to the electrolytic cell, use a 10 cm high-purity graphite rod as the working electrode, a platinum wire electrode as the counter electrode, and a calomel electrode as the reference electrode to insert into the electrolytic cell ; Use the potentiostatic chronoamperometry to electrolyze the graphite rod, set the operating voltage to 3-5V, and the electrolysis time is 1h; filter the electrolyzed solution 3 times with a filter head with a pore size of 0.22 μm; then put the filtrate into a dialysis bag (with a cut-off of 3500Da), dialyze for 48 hours, and change the water every 12 hours to obtain highly dispersed nitrogen-doped graphene quantum dots in the water phase with a concentration of 0.2 mg / mL.

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Abstract

The invention discloses a preparation method of nitrogen doped graphene quantum dots with high dispersion in a water phase and an application. The preparation method comprises the following steps: anaqueous solution of tetrabutylammonium hydroxide is used as an electrolyte; a graphite rod with high purity is used as a working electrode, a platinum wire electrode is used as a counter electrode, acalomel electrode is used as a reference electrode, and fixed potential chronoamperometry is used for electrolysis of the graphite rod; an electrolytic solution is filtered in order to remove a graphene slice layer, a dialysis bag is used for dialysis, in order to obtain the nitrogen doped graphene quantum dots with high dispersion in a water phase. The preparation method has the advantages of simple process, cheap and easily available raw materials, and short preparation time; the nitrogen doped graphene quantum dots have the characteristics of good dispersion in water phase, long fluorescentlifetime, high quantum yield, good biocompatibility, and the like; and the nitrogen doped graphene quantum dots have good application prospects in the fields of fluorescence detection of life samplesand imaging.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method and application of highly dispersed nitrogen-doped graphene quantum dots in an aqueous phase. Background technique [0002] In recent years, graphene quantum dots, as a new type of quantum dots, have attracted widespread attention due to their unique properties. Graphene quantum dots (GQDs) have shown great potential application value in many life science fields such as cell imaging and biosensing due to their low toxicity, stable fluorescence properties, high dispersion in water, and good biocompatibility. . More importantly, the properties of GQDs can be further tuned by controlling their size, edge shape, and tailoring their electronic structures. Among them, heteroatom doping is the most effective way to regulate the electronic structure of GQDs. The doping of heteroatoms can regulate the bandwidth of GQDs and improve its fluorescence ...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/327G01N21/64
CPCG01N21/6456G01N21/6486G01N27/327G01N27/48
Inventor 吴萍杨冠草蔡称心
Owner NANJING NORMAL UNIVERSITY
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