High thermal conductivity graphene-carbon nano slurry and preparation method thereof

Abstract

The invention provides a high thermal conductivity graphene-carbon nano slurry and a preparation method thereof. The preparation method comprises the following steps: (1) preparing highly dispersed nano silicon dioxide particles with a gel-sol method; (2) modifying a graphene oxide by using a coupling agent, and enabling the coupling agent to react with graphene to obtain functional graphene, wherein the functional graphene is dispersed in a butyl carbitol dispersion liquid after being ultrasonically treated to form a functional graphene dispersion liquid; (3) adding the nano silicon dioxide particles to the functional graphene dispersion liquid in a stirring state, and mixing for 30-120min; and (4) mixing the functional graphene dispersion liquid with an organic solvent, an auxiliary agent and the nano silicon dioxide particles fully and uniformly to obtain the high thermal conductivity graphene-carbon nano slurry. For a thermal conductive film prepared with the graphene-carbon nano slurry of the invention, a measured thermal conductivity coefficient is 1800W / m.k and excellent thermal conductive characteristics are shown; and moreover, the high thermal conductivity graphene-carbonnano slurry is a good far-infrared heating source material.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, and in particular relates to a graphene carbon nano-slurry with high thermal conductivity and a preparation method thereof. Background technique [0002] In recent years, the size of various chips has been further reduced, the power has increased, and the heat is concentrated in the small-sized chip, resulting in a higher thermal density of the chip. When the junction temperature changes, it will inevitably cause internal electron and hole concentrations, forbidden band width and carrier Changes in microscopic parameters such as mobility will cause a series of problems such as accelerated chip aging and shortened service life, and even lead to chip failure. Therefore, it is imperative to adopt new high thermal conductivity composite materials [0003] Graphene is a hexagonal and honeycomb lattice film composed of carbon atoms with sp2 hybrid orbitals. It is a two-dimensional mat...

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Problems solved by technology

However, the dispersion of graphene in the matrix material is relatively poor, and the van der Waals force between graphene sheets is relatively large, which is prone to agglomeration, making it difficult to dissolve in water and other commonly used organic solvents, thereby limiting the use of graphite. Further research and application of alkenes