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Preparation method of gram-level nitrogen-doped graphene quantum dot capable of being used as fluorescent ink

A graphene quantum dot and fluorescent ink technology is applied in the preparation of nitrogen-doped graphene quantum dots, and in the field of preparation of gram-level nitrogen-doped graphene quantum dots, achieving low market price, short preparation time and high fluorescence yield. Effect

Inactive Publication Date: 2017-12-22
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem, however, is that these gram-scale methods of making graphene quantum dots are not nitrogen-doped

Method used

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  • Preparation method of gram-level nitrogen-doped graphene quantum dot capable of being used as fluorescent ink
  • Preparation method of gram-level nitrogen-doped graphene quantum dot capable of being used as fluorescent ink
  • Preparation method of gram-level nitrogen-doped graphene quantum dot capable of being used as fluorescent ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Weigh 3 g of nitrilotriacetic acid and put it into the reaction kettle, and pour nitrogen into the reaction kettle at a flow rate of 2 mL / s for 5 minutes, then seal the reaction kettle and react at 230° C. for 3 hours. The product was dissolved in ethanol, and the supernatant was taken after centrifugation at a speed of 10,000 rpm, which was a saturated ethanol solution of nitrogen-doped graphene quantum dots. One volume of the saturated ethanol solution and one volume of glycerin are mixed, and the oily mixed liquid is poured into the washed ballpoint pen core to obtain an oily fluorescent ink for a ballpoint pen. The ethanol solution is evaporated to dryness, dissolved in water to obtain a saturated aqueous solution, and sucked into a fountain pen ink bag to obtain a water-like fluorescent ink for a fountain pen. Due to the low reaction time of the product, the polymerization reaction is not complete, so the yield is low, but it does not affect the applicati...

Embodiment 2

[0019] Example 2: Weigh 3 g of nitrilotriacetic acid and put it into the reactor, and pour nitrogen into the reactor at a flow rate of 5 mL / s for 10 minutes, then seal the reactor and react at 230° C. for 3 hours. The product was dissolved in ethanol, and the supernatant was taken after centrifugation at a speed of 10,000 rpm, which was a saturated ethanol solution of nitrogen-doped graphene quantum dots. One volume of the saturated ethanol solution and one volume of glycerin are mixed, and the oily mixed liquid is poured into the washed ballpoint pen core to obtain an oily fluorescent ink for a ballpoint pen. The ethanol solution is evaporated to dryness, dissolved in water to obtain a saturated aqueous solution, and sucked into a fountain pen ink bag to obtain a water-like fluorescent ink for a fountain pen. In this example, the flow rate and time of nitrogen gas flow are changed, but there is no obvious difference in the properties and yield of the product. It can be seen th...

Embodiment 3

[0020] Example 3: Weigh 5 g of nitrilotriacetic acid and put it into the reaction kettle, and pour nitrogen into the reaction kettle at a flow rate of 2 mL / s for 5 minutes, then seal the reaction kettle and react at 250° C. for 3 hours. The product was dissolved in ethanol, and the supernatant was taken after centrifugation at a speed of 10,000 rpm, which was a saturated ethanol solution of nitrogen-doped graphene quantum dots. One volume of the saturated ethanol solution and one volume of glycerin are mixed, and the oily mixed liquid is poured into the washed ballpoint pen core to obtain an oily fluorescent ink for a ballpoint pen. The ethanol solution is evaporated to dryness, dissolved in water to obtain a saturated aqueous solution, and sucked into a fountain pen ink bag to obtain a water-like fluorescent ink for a fountain pen. In this embodiment, the reaction temperature is increased, and the polymerization is performed at a sufficiently high temperature, so that the reac...

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Abstract

The invention discloses a preparation method of a gram-level nitrogen-doped graphene quantum dot capable of being used as fluorescent ink in the form of water and oil. The gram-level nitrogen-doped graphene quantum dot is prepared from cheap nitrilotriacetic acid as a raw material in reaction conditions of high temperature and high pressure environment by an oven commonly used in a laboratory as reaction equipment by the method of high temperature and pressure polymerization. The gram-level nitrogen-doped graphene quantum dot prepared by the method has the characteristics of uniform size, good dispersibility, high fluorescence yield, high purity and large yield and the like.

Description

Technical field [0001] The invention relates to a method for preparing nitrogen-doped graphene quantum dots, in particular to a method for preparing gram-level nitrogen-doped graphene quantum dots that can be used as fluorescent inks, and belongs to the field of graphene material preparation. Background technique [0002] Since the discovery of graphene, due to its excellent physical and chemical properties, it has been widely concerned by the scientific community. Graphene quantum dots not only retain the characteristics of graphene, but also obtain more unique optical and electrical properties due to its nanometer scale, making it widely used in physics, chemistry, medicine and other fields, in solar cells, biomedicine, Sensors and light-emitting diodes have attractive application prospects. This year, through the doping of heterogeneous atoms (boron, nitrogen, sulfur, etc.) of graphene quantum dots, the optical properties of graphene quantum dots can be effectively improved a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09D11/17C09D11/18
CPCC09K11/65C09D11/17C09D11/18C09K11/0883
Inventor 王玲玉
Owner XUZHOU NORMAL UNIVERSITY
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