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A method for obtaining two-dimensional materials based on the exfoliation of graphene quantum dots

A technology of graphene quantum dots and two-dimensional materials, which is applied in nanotechnology, chemical instruments and methods, inorganic chemistry, etc. for materials and surface science, and can solve the unreported and large-scale preparation limitations of graphene quantum dot strippers , toxicity complexity and other issues

Active Publication Date: 2016-06-01
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Recently, there have been many reports on liquid phase stripping methods, among which the research using large π-π interactions includes: organic solvents such as perfluoroaromatic hydrocarbons as stripping agents (BourlinosABetal.Small, 2009,5,1841.), pyrene compounds as Stripping agent (LeeDWetal.Chem.Commun., 2011,47,8259;), but due to the potential toxicity of small organic molecules and the complexity of synthesis, its mass preparation is limited
[0004] Graphene quantum dots have not been reported as strippers

Method used

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  • A method for obtaining two-dimensional materials based on the exfoliation of graphene quantum dots
  • A method for obtaining two-dimensional materials based on the exfoliation of graphene quantum dots
  • A method for obtaining two-dimensional materials based on the exfoliation of graphene quantum dots

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Embodiment 1

[0026] A method for obtaining a two-dimensional material based on exfoliation of graphene quantum dots, the specific steps are:

[0027] a. 5mg graphene quantum dots, 5mg graphite and 10ml water are added in the reaction vessel;

[0028] b. Stir and heat the reaction vessel after sealing it, and continue to stir and react at a constant temperature for 24 hours after heating to 100°C;

[0029] c. Ultrasonic treatment of the reacted solution at a power of 100W for 5h;

[0030] d. Centrifuge the solution after ultrasonic treatment at 500rpm for 40min; then centrifuge at 10000rpm for 3 times, each time for 10min, and the solid obtained after separation is the sheet-layer two-dimensional material graphene.

[0031] figure 1 is the low-resolution transmission electron micrograph of the prepared graphene; figure 2 is a high-resolution transmission electron micrograph of the prepared graphene.

Embodiment 2

[0033] A method for obtaining a two-dimensional material based on exfoliation of graphene quantum dots, the specific steps are:

[0034] a. 5mg graphene quantum dots, 5mg graphite and 10ml water are added in the reaction vessel;

[0035] b. Stir and heat the reaction vessel after sealing it, and continue to stir and react at a constant temperature for 24 hours after heating to 100°C;

[0036] c. Ultrasonic treatment of the reacted solution at a power of 100W for 42 hours;

[0037] d. Centrifuge the solution after ultrasonic treatment at 500rpm for 40min; then centrifuge at 8000rpm for 3 times, each time for 60min, and the solid obtained after separation is the sheet-layer two-dimensional material graphene.

Embodiment 3

[0039] A method for obtaining a two-dimensional material based on exfoliation of graphene quantum dots, the specific steps are:

[0040] a. 5mg graphene quantum dots, 5mg graphite and 10ml water are added in the reaction vessel;

[0041] b. Stir and heat the reaction vessel after sealing it, and continue to stir and react at a constant temperature for 24 hours after heating to 100°C;

[0042] c. Ultrasonic treatment of the reacted solution at a power of 100W for 28 hours;

[0043] d. Centrifuge the solution after ultrasonic treatment at 500rpm for 40min; then centrifuge at 10000rpm for 3 times, each time for 10min, and the solid obtained after separation is the sheet-layer two-dimensional material graphene.

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Abstract

The invention discloses a method based on graphene quantum dot peeling for obtaining a two-dimensional material. The method comprises the following steps: a, adding a graphene quantum dot, a three-dimensional material and water into a reaction container; b, sealing the reaction container, subsequently stirring and heating till a reaction temperature, keeping the temperature, and continuously stirring to react; c, performing ultrasonic treatment on the reacted solution; d, performing centrifugal separation on the solution after the ultrasonic treatment, and separating to obtain solid, that is, a laminated two-dimensional material. According to the method, the graphene quantum dot is used as a peeling agent which is a 'laminated' zero dimension carbon material, is relatively good in water solubility and has a large pi-pi delocalization structure, the pi-pi structure can act with the laminated three-dimensional material so as to obtain the laminated two-dimensional material through peeling, and thus the method is green, novel and applicable to on-scale production.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing two-dimensional materials by exfoliating graphene quantum dots. Background technique [0002] Graphene is a two-dimensional atomic crystal, which is very likely to become the next generation of breakthrough materials to replace traditional materials. Graphene has extremely superior physical properties: room temperature electron mobility 2.5×10 5 cm 2 ·V -1 ·s -1 , Young's modulus 1TPa, intrinsic strength 130GPa, high thermal conductivity 3,000Wm·K -1 , Optical absorption value πα≈2.3%, impervious to any gas. The common preparation methods of graphene are: mechanical exfoliation method, chemical exfoliation method, graphene oxide method, chemical vapor deposition method, SiC epitaxial growth method and so on. The graphene oxide method has been widely used by researchers, because it can be prepared in large quantities and its synthesis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04B82Y30/00C01B32/194
Inventor 杨志徐明瀚朱兴忠魏浩张亚非
Owner SHANGHAI JIAOTONG UNIV