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Method for testing electrical conductivity of graphene powder

A technology of graphene powder and bulk conductivity, which is applied in the preparation of test samples, measuring devices, and material analysis through electromagnetic means, which can solve the problems that affect the accuracy of graphene conductivity test results, unevenness of graphene surface, Graphene powder is not easy to form into sheets, etc., to achieve good compression molding, simple steps, and good integrity

Inactive Publication Date: 2018-08-28
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the four-probe method has an obvious disadvantage that graphene powder is not easy to form into sheets during sheeting, and the surface of graphene after sheeting is uneven, which directly affects the accuracy of graphene conductivity test results.

Method used

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  • Method for testing electrical conductivity of graphene powder
  • Method for testing electrical conductivity of graphene powder
  • Method for testing electrical conductivity of graphene powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Weigh 48 mg of graphene powder and 12 mg of PVDF and grind them evenly in a mortar, prepare an aluminum foil with a thickness of 15 μm that is suitable for the sheet-making mold, spread the aluminum foil on the bottom of the mold, pour the ground sample into the mold, and cover the upper layer as well Aluminum foil, adjust the tablet press to a pressure of 25 MPa for tableting, and keep the pressure for 30 minutes; take out the graphene sheet, and tear off the aluminum foil attached to its surface, and use an electronic digital display outer diameter micrometer to measure different positions of the tablet (take The thickness of the three points on the left, center, and right), and the conductivity of the three points on the left, center, and right are measured, and the average value is calculated as the conductivity of the graphene powder.

[0076] The conductivity test results are shown in Table 1 below.

[0077] Table 1

[0078]

[0079]

Embodiment 2

[0081] Weigh 48mg of graphene powder and 12mg of PVP and grind them evenly in a mortar; prepare an aluminum foil with a thickness of 15μm that is suitable for the sheet-making mold, spread the aluminum foil on the bottom of the mold, pour the ground sample into the mold, and cover the upper layer as well Aluminum foil, adjust the tablet press to a pressure of 25 MPa for tableting, and keep the pressure for 30 minutes; take out the graphene sheet, and tear off the aluminum foil attached to its surface, and use an electronic digital display outer diameter micrometer to measure different positions of the tablet (take The thickness of the three points on the left, center, and right), and the conductivity of the three points on the left, center, and right are measured, and the average value is calculated as the conductivity of the graphene powder.

[0082] The conductivity test results are shown in Table 2 below.

[0083] Table 2

[0084]

[0085]

Embodiment 3

[0087] Weigh 48mg of graphene powder and 24mg of PVDF and grind them evenly in a mortar; prepare an aluminum foil with a thickness of 15μm that is suitable for the tablet-making mold, spread the aluminum foil on the bottom of the mold, pour the ground sample into the mold, and cover the upper layer as well Aluminum foil, adjust the tablet press to a pressure of 25 MPa for tableting, and keep the pressure for 30 minutes; take out the graphene sheet, and tear off the aluminum foil attached to its surface, and use an electronic digital display outer diameter micrometer to measure different positions of the tablet (take The thickness of the three points on the left, center, and right), and the conductivity of the three points on the left, center, and right are measured, and the average value is calculated as the conductivity of the graphene powder.

[0088] The conductivity test results are shown in Table 3 below.

[0089] table 3

[0090]

[0091]

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Abstract

The invention provides a method for testing the electrical conductivity of graphene powder and relates to the technical field of detection of the electrical conductivity of graphene. The method for testing the electrical conductivity of the graphene powder comprises the following steps: in a sheet production process, carrying out tabletting on a mixture of the graphene powder and a binding agent;then testing the electrical conductivity of a graphene thin sheet, formed by tabletting, by utilizing a four-probe method; preferably, placing a foil sheet between the mixture of the graphene powder and the binding agent, and a sheeting mold. According to the method provided by the invention, the graphene powder can be tabletted and molded better and the prepared thin sheet has good integrity, isfirm and is not easy to break, so that the testing accuracy is improved; moreover, the foil sheet is preferably placed so that the surface of the graphene thin sheet is smoother. By adopting the method provided by the invention, the defects of a traditional method that the sheet is not easy to mold, the surface of the prepared graphene thin sheet is uneven and a testing result is not accurate enough are overcome, and the method is simple and feasible.

Description

technical field [0001] The invention relates to the technical field of graphene conductivity detection, in particular to a method for testing the conductivity of graphene powder. Background technique [0002] Since its discovery in 2004 by Nobel Prize-winning physicists Andre Geim and Konstantin Novoselov of the University of Manchester in the United Kingdom, graphene has demonstrated its high strength and high conductivity. High-quality properties such as high flexibility and high flexibility are highly valued by countries all over the world. [0003] Graphene is a two-dimensional honeycomb body formed by a single layer of carbon atoms tightly packed, and is the basic unit for constructing other dimensional (zero-dimensional fullerenes, one-dimensional carbon nanotubes, three-dimensional graphite) carbon allotropes . In nature, graphene is the thinnest material known to people, with a thickness of only 0.335nm. Its atomic arrangement is the same as that of monoatomic lay...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/38G01N27/04
CPCG01N1/286G01N1/38G01N27/043
Inventor 宋昕王超武肖双张晓玉朱胜凯王瑛赵成龙
Owner SHANDONG YUHUANG NEW ENERGY TECH
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