Method for solvothermal preparation of fluorescent carbon nitride quantum dots

A fluorescent carbon nitride and quantum dot technology, applied in the field of nanomaterials, can solve the problems of harsh reaction conditions, human and environmental hazards, and long reaction time, and achieve the effects of stable water solubility, good dispersibility, and low production cost

Inactive Publication Date: 2016-10-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through the above method, graphitic carbon nitride quantum dots with fluorescent properties can be successfully prepared, but there are still shortcomings such as long reaction time, tedious experimental process and harsh reaction conditions.
In addition, a large amount of organic solvents and strong oxidants are used in the reaction process, which causes great harm to the human body and the environment; the yield and fluorescence efficiency of graphite-phase carbon nitride quantum dots prepared by existing methods are still low, which also greatly limits Its industrial production and application

Method used

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  • Method for solvothermal preparation of fluorescent carbon nitride quantum dots
  • Method for solvothermal preparation of fluorescent carbon nitride quantum dots
  • Method for solvothermal preparation of fluorescent carbon nitride quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of graphite phase carbon nitride powder

[0028] 18 g of melamine was loaded into an alumina porcelain boat and placed in a muffle furnace. Ramp to 600 °C at a rate of 3 °C / min, hold for 2 hours, and then cool to room temperature at a rate of 3 °C / min. Put it into an agate mortar and grind to obtain 5.84 g of graphite phase carbon nitride powder.

[0029] (2) Preparation of carbon nitride quantum dots

[0030] Disperse 30 mg of graphitic carbon nitride powder in (1) into 30 ml of absolute ethanol solution, add 0.45 ml of potassium hydroxide, and mix ultrasonically for 5 min. Transfer the mixed solution to a reaction kettle, seal it, put it in an oven, raise the temperature to 180°C, maintain it for 16h, and cool it down to room temperature naturally. The treated dispersion was collected by vacuum filtration to obtain a pale yellow filtrate. The filtrate was dialyzed in a 10,000 Da dialysis bag until neutral. The obtained dialysate was frozen, and th...

Embodiment 2

[0033] Disperse 40 mg of graphitic carbon nitride powder obtained in Example (1) into 30 ml of glycerin solution, add 0.30 ml of sodium hydroxide, and mix ultrasonically for 5 min. Transfer the mixed solution (mixed solution) to a reaction kettle, seal it, put it in an oven, raise the temperature to 200 °C, maintain it for 12 h, and cool it down to room temperature naturally. The treated mixture was collected by vacuum filtration to obtain a pale yellow filtrate. The filtrate was dialyzed in a 10000 Da dialysis bag until neutral. The obtained dialysate was frozen, and then freeze-dried at a temperature of -45°C and an air pressure of 20 Pa to obtain solid carbon nitride quantum dots.

Embodiment 3

[0035] Disperse 50 mg of the graphitic carbon nitride powder obtained in Example (1) in 40 ml of methanol solution, add 0.35 ml of lithium hydroxide, and ultrasonically mix for 5 min. The mixed solution was transferred to a reaction kettle, sealed, put into an oven, heated to 120 °C, maintained for 10 h, and cooled to room temperature naturally. The treated mixture was collected by vacuum filtration to obtain a pale yellow filtrate. Fill the filtrate into 8000 Da dialysis bags until neutral. The obtained dialysate was frozen, and then freeze-dried at a temperature of -40 °C and an air pressure of 10 Pa to obtain solid carbon nitride quantum dots.

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Abstract

The invention belongs to technical field of nanomaterials and discloses a method for solvothermal preparation of fluorescent carbon nitride quantum dots by adoption of melamine as a raw material. The method includes steps: a) calcining melamine in a muffle furnace at a high temperature, and grinding products into yellow graphite-phase carbon nitride powder; b) scattering the graphite-phase carbon nitride powder into an alcohol solvent, adding a certain amount of alkali liquor, dissolving ultrasonically, sealing in a reaction kettle, and reacting for a while at a high temperature; c) cooling to the room temperature, collecting filtrate after vacuum filtration, and dialyzing the filtrate in a dialysis bag with a certain molecular weight cutoff until the filtrate is neutral, so that the fluorescent carbon nitride quantum dots are obtained. The method is simple in process, easy in operation, low in cost and environment friendly, and the prepared fluorescent carbon nitride quantum dots are high in purity and yield, excellent in dispersity and stability and high in fluorescence intensity and have a potential application prospect in fields of bioimaging, solar cells and the like.

Description

technical field [0001] The invention relates to a method for solvothermally preparing fluorescent carbon nitride quantum dots, which belongs to the technical field of nanometer materials. Background technique [0002] With the discovery of graphene materials, layered 2D nanomaterials have been extensively studied. Due to its unique mechanical properties, optical properties and electrical properties, it has potential applications in physics, optoelectronic devices, sensors and biological imaging. [0003] Carbon nitride and graphene have similar structures and are typical representatives of graphene congeners. The properties of materials depend largely on the internal arrangement of atoms. A single layer of carbon nitride is only atomically thick, and is composed of carbon atoms and nitrogen atoms through sp 2 A regular planar hexagonal structure formed by covalent bonds, relying on weak van der Waals force between layers. It is precisely because nitrogen atoms replace th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06B82Y30/00
CPCB82Y30/00C01B21/0605C01P2002/72C01P2004/04C01P2004/64
Inventor 胡超凡战岩刘青青
Owner TAIYUAN UNIV OF TECH
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