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Method for preparing graphene through phase peeling of graphite by using mixed solvent

A technology of mixing solvent phases and exfoliating graphite, applied in the direction of graphene, nano-carbon, etc., can solve the problems of high boiling point of organic solvents, mismatch of Hansen solubility parameters, toxicity, etc.

Inactive Publication Date: 2015-02-04
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] The present invention aims at the deficiency that a single organic solvent has a high boiling point and is toxic and difficult to remove or does not match the Hansen solubility parameter of graphene, and provides a method for preparing graphene by using a mixed solvent to phase exfoliate graphite

Method used

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  • Method for preparing graphene through phase peeling of graphite by using mixed solvent
  • Method for preparing graphene through phase peeling of graphite by using mixed solvent
  • Method for preparing graphene through phase peeling of graphite by using mixed solvent

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Embodiment 1

[0050] Such as Figure 1 to Figure 3 Shown is the curve of the Hansen solubility parameter of the mixed solvent changing with the volume fraction of methanol, according to Figure 4 Shown, calculate the optimal volume ratio when the Hansen solubility parameter of methanol and ethylene dichloride mixed solvent is close to graphene: 1, start; 2, utilize least square method to solve optimal mole fraction matrix equation: Ax=b (solve Utilize the Hansen solubility parameter 3,4 of methanol and ethylene dichloride in the process; 5, solve the equation that mole fraction is converted into volume fraction (use the relative molecular weight of methanol and ethylene dichloride in the solution process, relative density 6,7 ); 8, the solubility parameter of the mixed solvent is closest to graphene; 9, end.

[0051] Embodiment 1 calculates the optimum volume fraction of methyl alcohol and ethylene dichloride, by the Hansen solubility parameter of methyl alcohol: δ d =15.1(MPa) 1 / 2 ,δ p...

Embodiment 2

[0056] Embodiment 2 changes the solvent in the implementation case 1 into methanol, toluene, and the Hansen solubility parameter of methanol: δ d =15.1(MPa) 1 / 2 ,δ p =12.3(MPa) 1 / 2 ,δ h =22.3(MPa) 1 / 2 , Toluene Hansen Solubility Parameter: δ d =18(MPa) 1 / 2 ,δ p =1.4(MPa) 1 / 2 ,δ h =2(MPa) 1 / 2, replace the A matrix in Ax=b with A = 15.1 - 18 12.3 - 1.4 22.3 - 2 , b = 18 - 18 9.3 - 1.4 7.7 ...

Embodiment 3

[0061] Embodiment 3 changes the solvent in the implementation case 1 into ethanol, chloroform, the Hansen solubility parameter of ethanol: δ d =15.8(MPa) 1 / 2 ,δ p =8.8(MPa) 1 / 2 ,δ h =19.4(MPa) 1 / 2 , chloroform Hansen solubility parameter: δ d =17.8(MPa) 1 / 2 ,δ p =3.1(MPa) 1 / 2 ,δ h =5.7(MPa) 1 / 2 , replace the A matrix in Ax=b with A = 15.8 - 17.8 8.8 - 3.1 19.4 - 5.7 , b = 18 - 17.8 9.3 - 3.1 7.7 ...

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Abstract

The invention relates to a method for preparing graphene through phase peeling of graphite by using a mixed solvent. The method comprises the following steps: 1, preparing a mixed solvent composed of at least two organic solvents having boiling points of not greater than 100DEG C; 2, adding powdery graphite to the mixed solvent to prepare a mixed solution of the powdery graphite, putting the mixed solution of the powdery graphite in an ultrasonic machine, carrying out water-bath ultrasonic treatment, and centrifuging through using a centrifuge; and 3, taking a supernatant obtained after the centrifuging with a pipette to obtain a graphene dispersion uniformly dispersed in the mixed solvent. The method enables the Hansen solubility parameters of the mixed solvent to reach the Hansen solubility parameters of graphene as possible through adjusting the volume ratio of the organic solvents in order to obtain a solvent which is most suitable for peeling and dispersing graphene, and the solvent is used to carry out the phase peeling of graphene.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing graphene by using a mixed solvent to phase-exfoliate graphite. Background technique [0002] In 2004, the research team of Geim, a professor at the University of Manchester, prepared graphene for the first time by mechanical exfoliation, and the excellent electrical, thermal, mechanical and quantum properties of graphene were discovered by scientists. In terms of electricity, the mobility of electrons is the highest, measured by the Kirill group at Columbia University up to 250,000 cm 2 / Vs, more than 100 times that of silicon, and its electron mobility hardly changes with temperature. At room temperature, the quantum tunneling effect of carriers reaches the extreme, and the carriers are transported ballistically in the micrometer scale. Its forbidden band width is almost zero, showing semi-metallic characteristics, and the graphene carrier type can be c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 张阳解婧罗巍李超波夏洋
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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