Graphene-based thermal conductive film preparing method

Abstract

The invention provides a graphene-based thermal conductive film preparing method which includes the steps that biological materials are stirred and squeezed broken, and a solvent is added to the biological materials to dilute the materials; ultrasonic suction filtration is conducted on the obtained biological material pulp, and filter liquor of the biological material pulp is obtained and sealed for use; ultrasound is conducted on a graphite oxide solution, and oxidized graphene sol is obtained; the biological material filter liquid is mixed with the oxidized graphene sol, the mixed solution is made to react, and a reduced graphene film is obtained; the thermal annealing is conducted on the obtained film under the conditions of the inert atmosphere and low temperature, and the high-thermal-conductive graphene film is obtained. The graphene film prepared through the method has the advantages of being thermal conductive, electric conductive, good in mechanical property, controllable in thickness, wide in raw material source and capable of achieving batch production easily.

Description

technical field [0001] The invention belongs to a method for preparing a heat-conducting film, in particular to a method for preparing a graphene-based heat-conducting film. Background technique [0002] In recent years, with the rapid development of science and technology, the design of instruments and equipment has become more and more obvious in the characteristics of lightness, thinness, shortness, smallness and high efficiency. However, at the same time, an important problem is that the equipment generates a lot of heat during operation. If the heat is not removed in time, it will seriously affect the working stability, safety and reliability of electronic devices. The key technology for preparing graphene-based thermally conductive films is to reduce graphene oxide. The current methods for reducing graphene oxide mainly include: (1) Thermal reduction. However, this method has relatively high requirements for the furnace, because the general processing of samples It ne...

AI Technical Summary

Problems solved by technology

However, at the same time, an important problem is that the equipment generates a lot of heat during operation. If the heat is not removed in time, it will seriously affect the working stability and safety reliability of electronic devices.

The key technology for preparing graphene-based thermally conductive films is to reduce graphene oxide. The current methods for reducing graphene oxide mainly include: (1) Thermal reduction. However, this method has relatively high requirements for the furnace, because the general processing of samples It needs to be at 1000°C, even as high as 2000°C, and it consumes energy; (2) solution chemical reduction, the reduction reagents used in this method are generally sodium borohydride, hydrazine hydrate, hydrogen iodide, and these reagents have strong Toxicity or strong corrosion; (3) hydrothermal reduction, this method needs to be carried out under high temperature and high pressure, and the prepared samples are extremely easy to agglomerate, once agglomeration occurs, the thermal conductivity of graphene-based films will be reduced greatly affected