Graphene/copper composite conductive material and preparation method thereof

Abstract

The invention discloses a graphene / copper composite conductive material and a preparation method thereof. The graphene / copper composite conductive material is formed by dispersing graphene in a coppermatrix uniformly. The preparation method comprises the steps that firstly at least one surface of an organic polymer thin film is exposed to laser irradiation, and the surface of the organic polymeris carbonized to form the graphene and presents a three-dimensional porous structure; then the graphene and substrate are put into a copper sulfate plating solution and subjected to electrochemical copper plating to form the graphene / copper composite material; the drying treatment in vacuum atmosphere is further carried out, and a composite material is stripped from the substrate; and finally thegraphene / copper composite conductive material is obtained through compression molding and high temperature sintering. According to the graphene / copper composite conductive material, because of the uniform distribution of the graphene in the copper matrix, good mechanical properties and electrical properties are achieved, the preparation method is simple in operation, raw materials are easy to obtain, and the graphene / copper composite conductive material meets different application demands, especially in the field of copper cables; and the graphene / copper composite conductive material is convenient to popularize.

Description

technical field

[0001] The invention relates to the field of graphene-based composite materials, in particular to a graphene / copper composite conductive material and a preparation method thereof. Background technique

[0002] Graphene is a two-dimensional material with a honeycomb structure formed by a single layer of carbon atoms. Due to its unique structure, it has excellent properties in the fields of electricity, optics, chemistry, mechanics and thermals. In terms of electricity, the electron mobility in graphene can reach 15000cm 2 / (V·S), about 140 times the electron mobility in silicon. In terms of mechanics, the tensile strength and elastic modulus of graphene reach 125GPa (single-layer graphene) and 1.1TPa, respectively, which are about 100 times the tensile strength of ordinary steel. Thermally, the thermal conductivity of graphene at room temperature is about 5×103W m -1 K -1 , which is higher than that of carbon nanotubes and diamond, and is the thermal condu...

Examples

Embodiment 1

[0036] The invention discloses a preparation method of a graphene / copper composite conductive material, which is used to solve the problem of uniform dispersion of graphene in the composite material. refer to figure 1 , the preparation method of the graphene / copper composite conductive material comprises the following steps.

[0037] (1) Preparation of porous graphene on organic substrates

[0038] One surface of an organic polymer film polyimide with a thickness of 150 μm is exposed to laser irradiation, and CO with a wavelength of 10.6 μm is selected in this embodiment. 2 Infrared laser, the laser power is 5W, the pulse frequency is 20kHz, and the laser scanning speed is 800mm / s. The surface of the polyimide film is carbonized to form porous graphene, and the parts not affected by the laser play a role in supporting the graphene, that is, the porous graphene on the organic substrate is obtained, and its pore structure is as follows: figure 2 As shown, the thickness of po...

Embodiment 2

[0044] The preparation method of the graphene / copper composite conductor material in this embodiment is the same as in Embodiment 1, the laser power used is 4W, and the rest of the conditions are the same as in Embodiment 1. The tensile strength of the prepared composite material is 311Mpa, and the electrical conductivity is 96%IACS.

Embodiment 3

[0046] The preparation method of the graphene / copper composite conductor material of this embodiment is the same as that of embodiment 1, and the electroplating time used is 15min, and all the other conditions are the same as that of embodiment 1. The tensile strength of the prepared composite material is 334Mpa, and the electrical conductivity is 88%IACS.

technical field

[0001] The invention relates to the field of graphene-based composite materials, in particular to a graphene / copper composite conductive material and a preparation method thereof. Background technique

[0002] Graphene is a two-dimensional material with a honeycomb structure formed by a single layer of carbon atoms. Due to its unique structure, it has excellent properties in the fields of electricity, optics, chemistry, mechanics and thermals. In terms of electricity, the electron mobility in graphene can reach 15000cm 2 / (V·S), about 140 times the electron mobility in silicon. In terms of mechanics, the tensile strength and elastic modulus of graphene reach 125GPa (single-layer graphene) and 1.1TPa, respectively, which are about 100 times the tensile strength of ordinary steel. Thermally, the thermal conductivity of graphene at room temperature is about 5×103W m -1 K -1 , which is higher than that of carbon nanotubes and diamond, and is the thermal condu...

Examples

Embodiment 1

[0036] The invention discloses a preparation method of a graphene / copper composite conductive material, which is used to solve the problem of uniform dispersion of graphene in the composite material. refer to figure 1 , the preparation method of the graphene / copper composite conductive material comprises the following steps.

[0037] (1) Preparation of porous graphene on organic substrates

[0038] One surface of an organic polymer film polyimide with a thickness of 150 μm is exposed to laser irradiation, and CO with a wavelength of 10.6 μm is selected in this embodiment. 2 Infrared laser, the laser power is 5W, the pulse frequency is 20kHz, and the laser scanning speed is 800mm / s. The surface of the polyimide film is carbonized to form porous graphene, and the parts not affected by the laser play a role in supporting the graphene, that is, the porous graphene on the organic substrate is obtained, and its pore structure is as follows: figure 2 As shown, the thickness of po...

Embodiment 2

[0044] The preparation method of the graphene / copper composite conductor material in this embodiment is the same as in Embodiment 1, the laser power used is 4W, and the rest of the conditions are the same as in Embodiment 1. The tensile strength of the prepared composite material is 311Mpa, and the electrical conductivity is 96%IACS.

Embodiment 3

[0046] The preparation method of the graphene / copper composite conductor material of this embodiment is the same as that of embodiment 1, and the electroplating time used is 15min, and all the other conditions are the same as that of embodiment 1. The tensile strength of the prepared composite material is 334Mpa, and the electrical conductivity is 88%IACS.

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