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Method for preparing graphene

A technology of graphene and graphite rods, which is applied in the field of material science and engineering, and can solve problems such as the thickness of graphene sheets

Inactive Publication Date: 2015-07-15
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the graphene sheets prepared by traditional electrochemical methods are relatively thick, which cannot well meet the needs of practical applications.

Method used

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preparation example Construction

[0025] Such as figure 1 The preparation method of the graphene of one embodiment shown, comprises the steps:

[0026] S10. Soak the graphite rod in the inorganic salt solution until the graphite rod is fully soaked.

[0027] The material of the graphite rod may be spectroscopically pure graphite with a particle size of 0.01 mm to 5 mm. The graphite rods can be pretreated, that is, the surface of the graphite rods is polished and decontaminated with sandpaper.

[0028] The inorganic salt solution is selected from sodium stannate (Na 2 SnO 3 ) solution and potassium stannate (K 2 SnO 3 ) in one of the solutions. The anion stannate ion contained in sodium stannate and potassium stannate (SnO 3 2- ) is equivalent to the distance (0.34nm) between the graphite flakes, which can intercalate between the graphite flakes to reduce the Van der Waals force between the graphite flakes, which is beneficial to stripping and obtaining thin-layer graphene.

[0029] The concentration o...

Embodiment 1

[0045] Take the graphite rod, polish and decontaminate its surface with sandpaper and keep it for later use. Prepare 100 mL of Na with a concentration of 0.1 mol / L 2 SnO 3 solution, soak the graphite rod in Na 2 SnO 3 After the graphite rod is fully infiltrated by the solution for 1 h, the fully infiltrated graphite rod is used as the anode, the platinum sheet electrode is used as the cathode, and the Na 2 SnO 3 The solution is an electrolyte, which is assembled into an electrolytic cell system. A working voltage of 10V was applied between the cathode and the anode, and the electrochemical stripping was continued for 120min, and then the power was turned off to stop the stripping. After taking out the cathode and anode, the electrolyte was ultrasonically treated for 1 hour, and then centrifuged at 3000rmp / min for 20 minutes, and the remaining upper liquid was the graphene aqueous solution. The graphene aqueous solution is sequentially subjected to suction filtration, was...

Embodiment 2

[0050] Take the graphite rod, polish and decontaminate its surface with sandpaper and keep it for later use. Prepare 100 mL of Na with a concentration of 0.2 mol / L 2 SnO 3 solution, soak the graphite rod in Na 2 SnO 3 After the graphite rod is fully infiltrated by the solution for 2 hours, the fully infiltrated graphite rod is used as the anode, the platinum sheet electrode is used as the cathode, and the Na 2 SnO 3 The solution is an electrolyte, which is assembled into an electrolytic cell system. A working voltage of 10V was applied between the cathode and the anode, and the electrochemical stripping was continued for 30min, and then the power was turned off to stop the stripping. After taking out the cathode and anode, the electrolyte was ultrasonically treated for 1 hour, and then centrifuged at 3000rmp / min for 20 minutes, and the remaining upper liquid was the graphene aqueous solution. The graphene aqueous solution is sequentially subjected to suction filtration, ...

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Abstract

The invention discloses a method for preparing graphene. The method comprises the following steps that a graghite rod is soaked in inorganic salt solution until the graghite rod is soaked fully; the fully-soaked graghite rid serves as a positive pole, a metal electrode serves as a negative pole, the inorganic salt solution serves as electrolyte solution, a electrolytic cell is assembled, and a constant voltage is imposed between the negative pole and the positive pole to conduct electrochemical stripping; the positive pole and the negative pole are taken out after electrochemical stripping is finished, the electrolyte solution is retained, and ultrasonic treatment is conducted on the electrolyte solution; supernatant liquid is retained after the electrolyte solution after being conducted the ultrasonic treatment is centrifuged, the supernatant liquid is aquoeous solution of graphene, residue is retained after the supernatant liquid of the graphene is filtered, washing and drying are conducted on the residue, and the graphene is obtained. According to the method for preparing the graphene, the thin-layer graphene is produced through electrochemical intercalation and expansive action, and the produced graphene lamella is comparatively thin.

Description

technical field [0001] The invention relates to the field of material science and engineering, in particular to a method for preparing graphene. Background technique [0002] Graphene is a single atomic layer material composed of carbon atoms with a six-membered ring as the basic unit. Graphene can be stacked into 3D graphite, rolled into 1D carbon nanotubes, or even wrapped into 0D fullerene. On a two-dimensional plane, sp 2 The hybridized carbon atoms are connected to the adjacent three carbon atoms through strong σ bonds, and the remaining P electron orbitals are perpendicular to the graphene plane, forming large π bonds with the surrounding atoms, making graphene have good conductivity. Graphene not only contains rich and novel physical phenomena, and has important theoretical research value, but also its unique structure and excellent performance may enable it to obtain significant practical applications in many fields, providing future economic and social development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 孙蓉赵波符显珠胡友根
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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