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Controllable graphene nanolayer preparation method

A nano-layer and graphene technology, which is applied in the field of controllable preparation of graphene nano-layers by laser irradiation, can solve the problems of high cost functional groups, doping, dependence on raw material quality and performance, etc., and achieve simple operation and low cost , the effect of large specific surface area

Inactive Publication Date: 2017-02-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation cost of these methods is relatively high, and the doping of various functional groups will appear in the synthetic products, which depends on the quality and performance of the raw materials. In addition, the uncontrollability of these methods limits the application range of graphene.

Method used

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  • Controllable graphene nanolayer preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Put the raw material graphite with a particle size of 4 μm in the reaction container, inject 50ml-200ml of deionized water, the concentration of graphite powder and solvent is 0.02g / ml, put the reaction container in the cavity of the ultrasonic cleaning machine, and turn on the cleaning machine. Disperse the graphite in deionized water; 2) Put the rotor into the reaction vessel, place the reaction vessel on the stirrer, start the stirrer, and control the speed to make the graphite evenly distributed in the deionized water; 3) Adjust the optical path of the pulse laser , so that the laser beam is focused 2-3mm below the liquid surface through the total reflection mirror and the focusing lens, the laser pulse frequency is 1-10Hz, and the laser energy is 4J; 4) Turn on the laser, and the laser irradiates the graphite in the liquid environment, and the reaction process continues Turn off the laser after 2 hours; 5) Place the reaction vessel in a desiccator to dry to obtai...

Embodiment 2

[0028] The difference from Example 1 is that in this example, raw material graphite with a particle size of 1 μm is placed in a reaction vessel, 50ml-200ml of deionized water is injected, the concentration of graphite powder and solvent is 0.025g / ml, and the reaction vessel is placed in ultrasonic cleaning In the machine cavity, turn on the washing machine to disperse the graphite in the deionized water; put the rotor into the reaction vessel, put the reaction vessel on the stirrer, start the stirrer, and control the speed so that the graphite is evenly distributed in the deionized water; adjust The optical path of the pulse laser makes the laser beam focus on 2-3mm below the liquid surface through the total reflection mirror and the focusing lens, the laser pulse frequency is 1-10Hz, and the laser energy is 8J; when the laser is turned on, the laser irradiates the graphite in the liquid environment, and the reaction After the process continued for 1.5 hours, the laser was turn...

Embodiment 3

[0030] The difference from Example 1 is that in this example, raw material graphite with a particle size of 0.5 μm is placed in a reaction vessel, 50ml-200ml of deionized water is injected, the concentration of graphite powder and solvent is 0.03g / ml, and the reaction vessel is placed in an ultrasonic wave. In the washing machine cavity, turn on the washing machine to disperse the graphite in the deionized water; put the rotor into the reaction vessel, put the reaction vessel on the stirrer, start the stirrer, and control the speed to make the graphite evenly distributed in the deionized water; Adjust the optical path of the pulsed laser so that the laser beam is focused 2-3mm below the liquid surface through the total reflection mirror and the focusing lens, the laser pulse frequency is 1-10Hz, and the laser energy is 12J; turn on the laser, and the laser irradiates the graphite in the liquid environment. After the reaction process continued for 1 hour, the laser was turned of...

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Abstract

The invention relates to a controllable graphene nanolayer preparation method. The method comprises the steps that graphite powder is put into a reaction container, a solvent is injected into the reaction container, ultrasonic vibration is conducted, and a stirrer is started, so that the raw material-graphite powder is fully and uniformly distributed in the solvent; a laser path is adjusted, so that laser beams sequentially pass through a total reflective mirror and a focus lens and then are focused at the position 3 mm below the liquid level; a pulse laser is started, different kinds of laser energy are adjusted to enable laser light to irradiate graphite particles in a liquid environment, after the reaction process lasts 1 h to 2 h, the laser is stopped, and finally graphene with the different layer numbers can be obtained. The method is easy to operate, controllable in layer number and free of toxins and pollution and has potential application in the fields of nanometer equipment and spintronics.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for controllably preparing graphene nano-layers by laser irradiation. Background technique [0002] Since Geim et al. used the micromechanical exfoliation method to successfully prepare single-layer graphene for the first time in 2004, there has been an upsurge in the study of graphene. At present, the methods for obtaining high-quality graphene mainly include physical exfoliation of graphite, chemical synthesis, and graphite oxide reduction. However, the preparation cost of these methods is relatively high, and the doping of various functional groups will appear in the synthesized products, which depends on the quality and performance of the raw materials. In addition, the uncontrollability of these methods limits the application range of graphene. The introduction of laser further broadens the preparation method of graphene, and has unexpected effects on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/04C01B2204/32C01P2002/82C01P2004/04
Inventor 任旭东刘蓉胡征征王冕
Owner JIANGSU UNIV
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