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Preparation method and film of graphene/silver nanowire composite film with high thermal conductivity and high electrical conductivity

A technology of silver nanowires and composite films, which is applied in the field of preparation of graphene composite films, can solve the problems of insufficient stability of graphene performance, lack of simple operation, high equipment requirements, etc., and achieve uniform layering, high thermal conductivity and electrical conductivity , low-cost effect

Active Publication Date: 2018-12-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the graphene film is prepared by electrophoretic deposition, the area size is controlled by the electrode, and the electrophoretic deposition voltage and deposition time can be controlled to prepare graphene films of different thicknesses. The operation is simple, easy to control, low in cost, and suitable for large-scale preparation. Inconvenience in transferring the resulting film to other substrates
In the preparation process of the first type of graphene film, graphite has to undergo two processes of oxidation and reduction, and the performance of the obtained graphene is not stable enough, which has a certain impact on subsequent research.
The second type of chemical vapor deposition method can obtain large-area high-quality single-layer graphene, but the equipment requirements are high, and the obtained films often need to be transferred to other substrates
[0005] In summary, the existing graphene composite film preparation methods lack simple operation, low cost, easy transfer from the substrate, and a method that can prepare large-area composite films.

Method used

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  • Preparation method and film of graphene/silver nanowire composite film with high thermal conductivity and high electrical conductivity
  • Preparation method and film of graphene/silver nanowire composite film with high thermal conductivity and high electrical conductivity
  • Preparation method and film of graphene/silver nanowire composite film with high thermal conductivity and high electrical conductivity

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Effect test

Embodiment 1

[0034] The preparation method of the high thermal conductivity described in the present embodiment, the highly conductive graphene / silver nanowire composite film is specifically carried out according to the following steps:

[0035] 1) Preparation of silver nanowires: 0.32mg FeCl 3 Dissolve in 20ml of ethylene glycol solution, then add 0.369g of polyvinylpyrrolidone to the solution, and magnetically stir for 10min; 0.34g of AgNO 3 Dissolve in 20ml ethylene glycol, stir well; use syringe pump to dissolve FeCl 3 The solution was slowly added to the AgNO 3 solution, fully stirred; inject the mixed solution into the reaction kettle, and react at 160°C for 2.5h to obtain the silver nanowire solution;

[0036] The FeCl 3 The molar concentration of the solution is 0.1mM / L; the molar concentration of the solution of the polyvinylpyrrolidone is 0.15M / L; the AgNO 3 The molar concentration of the solution is 0.1M / L; the injection rate of the syringe pump is 1mL / min;

[0037] Dispers...

Embodiment 2

[0051] The preparation method of the high thermal conductivity described in the present embodiment, the highly conductive graphene / silver nanowire composite film is specifically carried out according to the following steps:

[0052] 1) Preparation of silver nanowires: 0.32mg FeCl 3 Dissolve in 20ml of ethylene glycol solution, then add 0.369g of polyvinylpyrrolidone to the solution, and magnetically stir for 10min; 0.34g of AgNO 3 Dissolve in 20ml ethylene glycol, stir well; use syringe pump to dissolve FeCl 3 The solution was slowly added to the AgNO 3 solution, fully stirred; inject the mixed solution into the reaction kettle, and react at 160°C for 2.5h to obtain the silver nanowire solution;

[0053] The FeCl 3 The molar concentration of the solution is 0.1mM / L; the molar concentration of the solution of the polyvinylpyrrolidone is 0.15M / L; the AgNO 3 The molar concentration of the solution is 0.1M / L; the injection rate of the syringe pump is 0.5mL / min;

[0054] Dispe...

Embodiment 3

[0065] The preparation method of the high thermal conductivity described in the present embodiment, the highly conductive graphene / silver nanowire composite film is specifically carried out according to the following steps:

[0066] 1) Preparation of silver nanowires: 0.32mg FeCl 3 Dissolve in 20ml of ethylene glycol solution, then add 0.369g of polyvinylpyrrolidone to the solution, and magnetically stir for 10min; 0.34g of AgNO 3 Dissolve in 20ml ethylene glycol, stir well; use syringe pump to dissolve FeCl 3 The solution was slowly added to the AgNO 3 solution, fully stirred; inject the mixed solution into the reaction kettle, and react at 160°C for 2.5h to obtain the silver nanowire solution;

[0067] The FeCl 3 The molar concentration of the solution is 0.1mM / L; the molar concentration of the solution of the polyvinylpyrrolidone is 0.15M / L; the AgNO 3 The molar concentration of the solution is 0.1M / L; the injection rate of the syringe pump is 0.8mL / min;

[0068] Dispe...

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Abstract

The invention relates to a film and a preparation method for a graphene / silver nanowire compound film with high thermal conductivity and high electric conductivity. The invention aims to solve the forming problem of the graphene / silver nanowire compound film. The method comprises the following steps: preparing a silver nanowire dispersion solution; preparing a graphene dispersion solution; mixing the silver nanowire dispersion solution with the graphene dispersion solution; preparing a compound film according to an electrostatic spraying deposition method; hotly pressing and sintering, thereby acquiring the graphene / silver nanowire compound film with high thermal conductivity and high electric conductivity. According to the method provided by the invention, the sample with high thermal conductivity, high electric conductivity, large size and uniform graphene dispersion can be prepared, the compound film is easy to separate from a substrate in a preparation process and the method can be widely applied to industrial production.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for preparing a graphene composite film and the film. Background technique [0002] Graphene is defined as a two-dimensional honeycomb lattice structure composed of only a single layer of carbon atoms tightly packed, and each carbon atom forms covalent bonds with three adjacent carbon atoms. Although graphene is only composed of one layer of carbon atoms, its morphology can be observed by various instruments to characterize important information such as the number of layers, thickness, and degree of crystallization of graphene. Each carbon atom in graphene has one s orbital and three p orbitals, among which the s orbital and two p orbitals form chemical bonds with the surrounding three adjacent carbon atoms, which do not contribute to the conductivity of graphene, while the remaining One p orbital is hybridized with each other to form valence band and conduction band,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194H01B1/00H01B1/20H01B1/22H01B1/24H01B13/00
CPCH01B1/00H01B1/20H01B1/22H01B1/24H01B13/00
Inventor 孙贤贤李宜彬赫晓东汪春晖
Owner HARBIN INST OF TECH
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