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Preparation method of synthetic graphene

A technology for synthesizing graphite and synthesizing loads, which is applied in the field of graphene, can solve problems such as high cost and complex process, and achieve the effect of reducing energy consumption, reducing reaction temperature, and requiring simple equipment

Active Publication Date: 2014-02-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process has a high temperature, requires no defects on the surface of the catalyst, and requires H 2 He and other carrier gases, the obtained samples need to be pickled to remove the metal substrate, the process is complicated and the cost is high, so the development of a low-temperature and simple method for synthesizing graphene has become a hot spot in current graphene research

Method used

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  • Preparation method of synthetic graphene
  • Preparation method of synthetic graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Place 20 grams of purchased sodium montmorillonite in 0.1mol / L of FeCl 3 The solution was stirred overnight, the purpose is to make the iron ions replace the sodium ions between the clay layers, and obtain the clay that absorbs iron ions between the layers; then centrifuge to discard the supernatant, and place the obtained precipitate in a 0.1mol / L FeCl 3 solution, so circulated 3 times, and finally the centrifuged precipitate was freeze-dried to obtain the loaded Fe 3+ Ionic montmorillonite catalyst.

[0035] Will Fe 3+- 0.5g of montmorillonite (yellow) is placed in one crucible, 5ml of benzene solution is placed in another crucible, and then these two crucibles are placed in the reactor of the reactor (the middle and lower part of the reactor has been separated by a steel plate) It is divided into two parts, but the upper end is not sealed, and the gas can diffuse freely in these two parts, the purpose is to allow the benzene vapor volatilized by heating to be abso...

Embodiment 2

[0038] Place 30 grams of purchased sodium montmorillonite in 0.1mol / L of FeCl 3 The solution was stirred overnight, the purpose is to make the iron ions replace the sodium ions between the clay layers, and obtain the clay that absorbs iron ions between the layers; then centrifuge to discard the supernatant, and place the obtained precipitate in a 0.1mol / L FeCl 3 solution, so circulated 3 times, and finally the centrifuged precipitate was freeze-dried to obtain the loaded Fe 3+ Ionic montmorillonite catalyst.

[0039] Will Fe 3+ - 0.5g of montmorillonite (yellow) is placed in one crucible, 5ml of benzene solution is placed in another crucible, and then these two crucibles are placed in the reactor of the reactor (the middle and lower part of the reactor has been separated by a steel plate) It is divided into two parts, but the upper end is not sealed, and the gas can diffuse freely in these two parts, the purpose is to allow the benzene vapor volatilized by heating to be abs...

Embodiment 3

[0041] Place 40 grams of purchased sodium montmorillonite in 0.1mol / L of FeCl 3 The solution was stirred overnight, the purpose is to make the iron ions replace the sodium ions between the clay layers, and obtain the clay that absorbs iron ions between the layers; then centrifuge to discard the supernatant, and place the obtained precipitate in a 0.1mol / L FeCl 3 solution, so circulated 3 times, and finally the centrifuged precipitate was freeze-dried to obtain the loaded Fe 3+ Ionic montmorillonite catalyst.

[0042] Will Fe 3+ - 0.5g of montmorillonite (yellow) is placed in one crucible, 5ml of benzene solution is placed in another crucible, and then these two crucibles are placed in the reactor of the reactor (the middle and lower part of the reactor has been separated by a steel plate) It is divided into two parts, but the upper end is not sealed, and the gas can diffuse freely in these two parts, the purpose is to allow the benzene vapor volatilized by heating to be abs...

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Abstract

The invention discloses a preparation method of synthetic graphene, belonging to the field of preparation of graphene. The preparation method comprises the following steps: synthesizing a Fe<3+>-supported smectite catalyst; respectively putting the Fe<3+>-smectite catalyst and a benzene solution in two crucibles, and putting the two crucibles in a high-pressure reaction kettle; and washing the reacted sample with hydrofluoric acid and nitric acid under ultrasonic conditions to remove the smectite framework, and carrying out freeze-drying to obtain the graphene black powder. The iron-ion-supported smectite catalyzes the dehydrogenation of benzene to synthesize the graphene at 250 DEG C in the high-pressure kettle, and no carrier gas is needed in the reaction process; and the method has the advantages of no requirements for catalyst surface, low reaction temperature and low reaction cost, and has certain application prospects.

Description

technical field [0001] The invention belongs to the field of graphene, and in particular relates to a preparation method for synthesizing graphene, that is, using montmorillonite loaded with ferric ions to catalyze benzene to synthesize graphene at a relatively low temperature. Background technique [0002] Graphene is a new material with a layered structure composed of carbon atoms, which has excellent electrical, thermal, and mechanical properties. For example, its electron mobility exceeds 15000 cm at room temperature 2 / (V s), higher than carbon nanotubes or silicon crystals, the resistivity is only about 10 -6 Ω·cm, lower than copper or silver, thermal conductivity as high as 5300W / m·K, higher than carbon nanotubes and diamonds, so it has been widely used in electronics, aerospace, optics, energy storage, biomedicine and other fields. [0003] Common methods for synthesizing graphene include mechanical exfoliation, chemical oxidation, crystal epitaxial growth, chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 谷成郭勇
Owner NANJING UNIV
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