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Method for preparing graphene by adopting electronic beam irradiation technology

A technology of electron beam irradiation and graphene, which is applied in the field of preparation of graphene and graphene by electron beam irradiation technology. The effect of mild preparation conditions and simple operation

Inactive Publication Date: 2009-12-23
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are many methods for preparing graphene, such as: exfoliation, chemical vapor deposition, thermal decomposition of SiC materials, etc., but none of these methods can strictly control the number and width of graphene layers, which limits the application of graphene

Method used

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  • Method for preparing graphene by adopting electronic beam irradiation technology
  • Method for preparing graphene by adopting electronic beam irradiation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of PMMA fiber

[0027] The nanofiber of PMMA is prepared by electrospinning method: PMMA is dissolved in the mixed solution of chlorobenzene and DMF (chlorobenzene and DMF are mixed with the volume ratio of 1: 1), the operating voltage at electrospinning is 25kV, working distance Under the condition that the distance between the substrate and the needle head is 12 cm, the fiber is deposited on the micro-grid, and the diameter of the obtained nanofiber is between 2 and 50 nanometers. To remove the solvent, the as-prepared PMMA nanofibers were annealed at 50 °C for 30 min.

[0028] 2. Preparation of 10nm wide 15-layer graphene

[0029] Electron beam irradiation was performed on a high-resolution transmission electron microscope. The working voltage is 200kV, and the strength is 5×10 6 enm -2 the s -1 , the beam spot size (diameter) is 10nm electron beam irradiation 15nm diameter PMMA nanofiber 120s, obtains 15 layers, 10nm wide graphene parallel to ele...

Embodiment 2

[0031] 1. Preparation of PMMA fiber

[0032] With embodiment 1.

[0033] 2. Preparation of 10nm wide 7-layer graphene

[0034] Electron beam exposure was performed on a transmission electron microscope. The working voltage is 200kV, and the strength is 5×10 6 enm -2 the s -1 , the beam spot size (diameter) is 10nm electron beam irradiation 15nm diameter PMMA nanofiber 3 minutes, obtains 7 layers, 10nm wide graphene parallel to electron beam irradiation direction.

Embodiment 3

[0036] 1. Preparation of PMMA fiber

[0037] With embodiment 1.

[0038] 2. Preparation of 10nm wide 3-layer graphene

[0039] Electron beam exposure was performed on a transmission electron microscope. The working voltage is 200kV, and the strength is 5×10 6 enm -2 the s -1 , PMMA nanofibers with a diameter of 15 nm were irradiated with an electron beam with a diameter of 10 nm for 4 minutes to obtain three layers of graphene with a width of 10 nm parallel to the direction of the electron beam irradiation.

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Abstract

The invention provides a method for preparing graphene with controllable layer number and width by adopting the electronic beam irradiation technology, comprising the following steps of: irradiating polymethyl methacrylate nanometer fibers by using electronic beams to enable the polymethyl methacrylate nanometer fibers to be gradually graphitized, and forming sequential multilayer graphene parallel to the irradiation direction of the electronic beams; and the number of layers and the width of the graphene are controlled through the current density, the irradiation time and the beam spot size of the electronic beams. The method is rapid, precise and controllable in preparing graphene with no need of high temperature, thus being suitably applied to the fundamental researches of micro-nanoelectronics.

Description

technical field [0001] The invention belongs to the technical field of new nanometer materials, and relates to a method for preparing graphene, in particular to a method for preparing graphene by using polymethyl methacrylate nanofibers as raw materials and adopting electron beam irradiation technology. Background technique [0002] Nanomaterials are a new type of materials, which are widely used in the fields of electronics, optics and other technologies. A large part of the current research on nanomaterials focuses on carbon-based nanostructure materials, including fullerenes, carbon nanofibers, carbon nanotubes, and graphene. Fullerenes and carbon nanotubes have attracted extensive attention due to their special conductive properties, but their diameter, orientation, and conductivity type are difficult to control, making them difficult to be widely used in nanoelectronics. [0003] Graphene is a two-dimensional carbonaceous new material, which has unique carrier characte...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 段辉高谢二庆赵建果刘延霞徐显波刘利新
Owner LANZHOU UNIVERSITY
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