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Method for preparing graphene quantum dots through carbon nano tube

A graphene quantum dot, carbon nanotube technology, applied in graphene, nanocarbon, nanotechnology and other directions, can solve difficult graphene quantum dots with controllable fluorescence, uniform particle size and chemical stability, not suitable for mass production and application , high cost and other problems, to achieve the effect of excellent fluorescence characteristics, consistent size and easy application

Active Publication Date: 2013-03-27
FUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In recent years, researchers have used electron beam etching, focused ion beam etching and other methods to prepare graphene quantum dots. These methods can only be used as preparation methods for basic research. The process is cumbersome, expensive, and the output is low and not suitable for batch production production and application
In addition, starting from various carbon sources, in the research of preparing graphene quantum dots through the method of solution "cutting", there are still difficulties in the preparation method to ensure the controllable fluorescence, consistent particle size and chemical stability of graphene quantum dots. problems such as sex, the present invention solves these problems in these respects

Method used

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  • Method for preparing graphene quantum dots through carbon nano tube
  • Method for preparing graphene quantum dots through carbon nano tube
  • Method for preparing graphene quantum dots through carbon nano tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use 0.030g double-walled carbon nanotubes (tube diameter <5nm, tube length 5~15um) to add a mixed solution of concentrated nitric acid and concentrated sulfuric acid, where the mass percentage of concentrated nitric acid is 68%, and the mass percentage of concentrated sulfuric acid is 98%, mixed with a volume ratio of 1:3.

[0025] After heating and magnetic stirring in a water bath, the heating temperature of the water bath is 100℃, the time is 24 hours, the magnetic stirring power is 80W, cooling to room temperature, diluting with 2 times volume of distilled water, using concentrated NaOH solution to adjust the mixed solution pH=8.

[0026] A dialysis bag with a molecular weight cut-off of 3000 Da was used for the dialysis treatment of the obtained solution. The dialysis time was 5 days, during which the distilled water outside the dialysis bag was replaced every 24 hours. The solution obtained after dialysis is subjected to ultrafiltration centrifugation to shrink water. ...

Embodiment 2

[0030] By changing the raw material in Example 1 to 0.030 g of multi-walled carbon nanotubes, and other conditions remain unchanged, a product similar to Example 1 can be obtained.

Embodiment 3

[0032] The heating temperature of the water bath in Example 1 is controlled to 90° C., and other conditions remain unchanged, and a product similar to Example 1 can be obtained.

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Abstract

The invention discloses a method for preparing graphene quantum dots through a carbon nano tube. The method comprises the following steps of: adding a mixed solution of nitric acid and sulfuric acid into the carbon nano tube, heating in a water bath, magnetically stirring, cooling to room temperature, diluting by using distilled water, regulating the pH value, performing dialysis and ultrafiltration centrifugation, and extracting through an organic solvent, so as to prepare the graphene quantum dots. The carbon nano tube which is diversified in growth modes and easy to control serves as a raw material, the graphene quantum dots are prepared through simple and controllable water bath heating and stirring operation; and the graphene quantum dot has the characteristics of good fluorescence effect, controllable fluorescence range, water solubility and the like, can be soluble with most of polymers through extraction and can be applied to the improvement of the device performance in photoelectric materials and devices.

Description

technical field [0001] The invention belongs to the technical field of preparation of graphene quantum dots, in particular to a method for preparing graphene quantum dots from carbon nanotubes. Background technique [0002] Graphene has become a high-profile upstart in materials and device applications due to its unique physical, chemical, and mechanical properties. The application of the material is limited. How to open the energy band of graphene and turn it into a semiconductor with adjustable band gap within a certain range has become the focus of research in the field of optoelectronic materials and devices. [0003] Experimental and theoretical studies have shown that graphene quantum dots have more significant edge effects and stronger quantum confinement effects than graphene nanoribbons. In addition, graphene quantum dots also have low cytotoxicity, good water solubility, stable fluorescence and excellent biocompatibility, which make graphene quantum dots have gre...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y30/00C01B32/184
Inventor 李福山郭太良寇丽杰陈伟吴朝兴吴晓晓胡雪花
Owner FUZHOU UNIV
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