Preparation method and application of nitrogen-doped graphene quantum dots

A graphene quantum dots, nitrogen protection technology, applied in chemical instruments and methods, fluorescence/phosphorescence, luminescent materials, etc., can solve the problems of limiting the wide application of nitrogen-doped graphene quantum dots, troublesome and time-consuming operations, and increased preparation costs. , to achieve the effect of low raw material price, simple equipment and good biocompatibility

Active Publication Date: 2015-08-26
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS +1
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  • Application Information

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Problems solved by technology

[0004] At present, the methods for preparing N-GQDs mainly include hydrothermal method, organic synthesis method, chemical cutting method and electrochemical method, but these methods have some shortcomings in terms of raw materials and preparation processes. For example, most of the raw materials are graphene oxide, Gra...

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  • Preparation method and application of nitrogen-doped graphene quantum dots
  • Preparation method and application of nitrogen-doped graphene quantum dots
  • Preparation method and application of nitrogen-doped graphene quantum dots

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Embodiment 1

[0034] Put 0.5g TATB in a muffle furnace under nitrogen protection, raise the temperature to 750°C at a heating rate of 2°C / min, keep it warm for 20min, and then cool down to room temperature naturally to obtain a polymer of nitrogen-doped graphene quantum dots , take the polymer 0.1g of the nitrogen-doped graphene quantum dots and place it in 18.75ml concentrated H 2 SO 4 and 5.25ml concentrated HNO 3 In the mixed acid with ultrasonic power of 300W, ultrasonic stripping was carried out for 2h, and then the stirring speed was set at 100°C to be 600r / min and stirred for 24h to obtain the solution of nitrogen-doped graphene quantum dots, and the solution of nitrogen-doped graphene quantum dots was added 50ml of water and sodium carbonate were used to adjust the pH value of the solution to 7, and finally the solution was dialyzed to obtain nitrogen-doped graphene quantum dots.

Embodiment 2

[0036] Place 0.5g TATB in a muffle furnace under the protection of nitrogen, raise the temperature to 500°C at a heating rate of 5°C / min, keep warm for 240min, and then cool down to room temperature naturally to obtain a polymer of nitrogen-doped graphene quantum dots. Get the polymer 0.1g of this nitrogen-doped graphene quantum dot and place in 18.75ml concentrated H 2 SO 4 and 5.25ml concentrated HNO 3 In the mixed acid with ultrasonic power of 400W, ultrasonic stripping was carried out for 2h, and then the stirring speed was set at 100°C to be 500r / min and stirred for 24h to obtain the solution of nitrogen-doped graphene quantum dots, and the solution of nitrogen-doped graphene quantum dots was added 50ml of water and sodium carbonate were used to adjust the pH value of the solution to 7, and finally the solution was dialyzed to obtain nitrogen-doped graphene quantum dots.

Embodiment 3

[0038] Place 0.5g TATB in a muffle furnace under nitrogen protection, raise the temperature to 900°C at a heating rate of 10°C / min, keep it warm for 40min, and then cool down to room temperature naturally to obtain a polymer of nitrogen-doped graphene quantum dots. Get the polymer 0.1g of this nitrogen-doped graphene quantum dot and place in 18.75ml concentrated H 2 SO 4 and 5.25ml concentrated HNO 3 In the mixed acid with ultrasonic power of 400W, the ultrasonic stripping was carried out for 2h, and then the stirring speed was set at 100°C to be 800r / min and stirred for 24h to obtain the solution of nitrogen-doped graphene quantum dots, and the solution of nitrogen-doped graphene quantum dots was added 50ml of water and sodium carbonate were used to adjust the pH value of the solution to 7, and finally the solution was dialyzed to obtain nitrogen-doped graphene quantum dots.

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Abstract

The invention discloses a preparation method and an application of nitrogen-doped graphene quantum dots. According to the method, TATB (triamino trinitrobenzene) with a high nitrogen content is adopted as a raw material; pyrolysis is carried out; and the nitrogen-doped graphene quantum dots (N-GQDs) are prepared. The size of the nitrogen-doped graphene quantum dots is 2-10nm, the thickness of the nitrogen-doped graphene quantum dots is 0.5-1.5nm, and the nitrogen content of the nitrogen-doped graphene quantum dots is 4-30%. The nitrogen-doped graphene quantum dots can stably exist in a water solution for a long time. As a result of cell imaging studies, the nitrogen-doped graphene quantum dots can emit bright green fluorescence, has good biocompatibility, and almost has no toxicity against biological cells. The preparation method is simple; raw material cost is low; the requirement on equipment is low; and the prepared nitrogen-doped graphene quantum dots have excellent light-emitting performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanomaterials, and relates to the preparation and application of a graphene quantum dot, in particular to the preparation of a nitrogen-doped graphene quantum dot and its application in live cell imaging. Background technique [0002] In recent years, nanomaterials with fluorescent properties have attracted the attention of many researchers at home and abroad, among which zero-dimensional graphene quantum dots (GQDs) are particularly prominent. GQDs are graphene sheets with a thickness of 0.5-1.5nm and a particle size of about 10nm. The surface contains hydroxyl, carboxyl, carbonyl and other groups to make it have good water solubility. GQDs not only exhibit excellent properties like graphene, but also have excellent properties such as good biocompatibility, low toxicity, low quenching, and stable chemical properties. Currently, GQDs have been used as fluorescent probes for cell imaging an...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64
Inventor 李瑞刘有松杨光成杨云涛沈金朋
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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