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Laser preparation method for large-area patterned graphene

A large-area, graphene technology, applied in graphene, nano-carbon, etc., can solve the problems of high quality, low efficiency, small size, etc., and achieve the effects of reduced nucleation rate, fast cooling, and large growth area

Active Publication Date: 2014-01-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above methods, the laser is an auxiliary energy source, which does not overcome the existing problems of the original methods such as chemical vapor deposition and graphene oxide reduction. At present, there are problems in the preparation of graphene such as small size, low efficiency, and high quality that need to be improved. still not well resolved

Method used

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  • Laser preparation method for large-area patterned graphene
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  • Laser preparation method for large-area patterned graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1, CO 2 Laser efficient preparation of graphene

[0037] In this embodiment, CO 2 Laser efficient preparation of graphene, the schematic diagram of the preparation process is as follows figure 1 shown.

[0038] (1) First remove the oxides on the surface of the platinum plate by mechanical grinding, then grind and polish with a polishing machine, and finally use alcohol for ultrasonic cleaning; the size of the platinum plate is 20mm×20mm×5mm;

[0039] (2) Disperse the nano-scale graphite powder into alcohol, use a dropper to absorb the alcohol solution containing carbon source and drop it on the surface of the treated platinum plate, then put the platinum plate in the glue homogenizer to shake and dry it evenly. To ensure uniformity and a certain thickness, stepwise acceleration is adopted to obtain a carbon coating with a thickness of 0.05mm; the graphite powder particle size is 350nm.

[0040] (3) Using 3000W CO 2 The graphite layer is irradiated by the la...

Embodiment 2

[0044] Embodiment 2, large-area and high-efficiency preparation of graphene by semiconductor laser

[0045] The semiconductor laser has a compact structure, stable laser output, high electro-optic efficiency, and long life. In particular, the semiconductor laser can output a rectangular uniform spot, which can realize large-area preparation of graphene. In this embodiment, the semiconductor laser is irradiated. Rapid preparation of large-area graphene, the schematic diagram of the preparation process is as follows figure 1 shown.

[0046] (1) Firstly, use mechanical grinding to remove oxides on the surface of the nickel plate, then use a grinding and polishing machine for grinding and polishing, and finally use alcohol for ultrasonic cleaning; the size of the nickel plate is 20mm×20mm×5mm.

[0047] (2) Disperse the graphite powder into alcohol, use a dropper to absorb the alcohol solution containing carbon source and drop it on the surface of the treated nickel plate, then pu...

Embodiment 3

[0052] Example 3. Efficient preparation of patterned graphene by fiber laser

[0053] Fiber lasers have the advantages of high beam quality, high power density, and high stability, and are widely used in the field of advanced manufacturing. In this example, patterned graphene is rapidly prepared by fiber laser irradiation on a titanium substrate pre-coated with micron graphite. The preparation process Schematic such as figure 1 shown.

[0054] (1) First, remove the surface oxide of the titanium plate by chemical corrosion, then grind and polish it with a polishing machine, and finally clean it ultrasonically with alcohol; the size of the titanium plate is 20mm×20mm×5mm.

[0055] (2) Disperse the graphite powder into the alcohol, use a dropper to absorb the alcohol solution containing the carbon source and drop it on the surface of the treated titanium plate, then put the titanium plate in the homogenizer for shaking and drying, in order to ensure uniform and a certain thickn...

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Abstract

The invention discloses a laser preparation method for large-area patterned graphene. The preparation method comprises the following steps: (1) a solid carbon source is dispersed in an organic solvent to obtain a dispersion liquid, and the surface of a metal substrate is coated with the dispersion liquid in a spinning manner to obtain a uniform carbon coating; (2) under the condition of the protection of inert gas, a high power density laser beam is adopted to irradiate the carbon coating, and carbon atoms in the solid carbon source and metal atoms in the metal substrate are formed into a solid solution under function of irradiation; the high power density laser beam is moved away or the irradiation operation is stopped, when the metal substrate is cooled, the oversaturated solid solution is formed, and the carbon atoms are separated out of the oversaturated solid solution and formed on the surface of the substrate to form graphene. The invention provides a novel method which is convenient, fast, low in cost and high in efficiency and prepares the large-area patterned graphene. The product obtained through the method can be applied to the following fields: next generation microcomputers, flat-panel displays, super-capacitors, transparent conductive electrodes, sensors, solar batteries, micro-nano electronic devices, photoelectronic devices, self-spinning quantum devices, novel compound materials and so on.

Description

technical field [0001] The invention relates to a large-area, patternable graphene laser preparation method. Background technique [0002] Graphene (Graphene) is a two-dimensional honeycomb structure formed by a single layer of carbon atoms tightly packed. It is the basic structural unit that constitutes other dimensional carbon materials. tubes or stacked into three-dimensional graphite. Since 2004, the Geim group of the University of Manchester in the United Kingdom has obtained independent high-quality graphene by using adhesive tape to peel off highly oriented pyrolytic graphite. Graphene has been found to have excellent electrical, optical, thermal, and mechanical properties. Displays, transistors, integrated circuits, supercapacitors, transparent conductive electrodes, sensors, solar cells, micro-nano electronic devices, optoelectronic devices, spin quantum devices, and new composite materials have broad application prospects. The basic theory, preparation technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 钟敏霖叶晓慧张红军
Owner TSINGHUA UNIV
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