Graphene-boron nitride composite material, application and preparing method thereof
A composite material, boron nitride technology, applied in the field of graphene-boron nitride composite materials, application and preparation, can solve the problems affecting the thermal conductivity of boron nitride/graphene composite materials, the connection is not close, etc., to achieve the connection Compactness, improved heat conduction performance, and efficient heat conduction network effect
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[0028] The preparation method of the graphene-boron nitride composite material of the embodiment of the present invention comprises the following steps:
[0029] Step 1: preparing graphene oxide.
[0030] Specifically, first, mix nitric acid with a mass concentration of 50-70% and sulfuric acid with a mass concentration of 70-99% in a volume ratio of 1:1-1:10 to obtain a mixed acid solution; Add 1-5g of expandable graphite to 100ml of the mixed acid solution, add the expandable graphite into the mixed acid solution, and stir magnetically for 5-60min under ice bath conditions; secondly, raise the reaction temperature to 2-20 °C, slowly add excess potassium permanganate into the mixed acid solution; secondly, raise the reaction temperature to 30-45 °C, and stir the mixed solution, react for 2-4h, and pour to the mixed acid solution after the reaction is completed Add hydrogen peroxide to the above mixed solution to remove excess potassium permanganate; finally, centrifuge, wash...
Embodiment 1
[0046] The preparation method of the graphene-boron nitride composite material of embodiment 1 is as follows:
[0047] Step 1: preparing graphene oxide.
[0048] According to the volume ratio of 1:6, mix 30ml of nitric acid with a mass concentration of 68% and 180ml of sulfuric acid with a mass concentration of 98% to obtain a mixed acid solution, add 5g of expandable graphite to the mixed acid, and magnetically Stir for 30min. The reaction temperature was raised to 5°C, and 30g of potassium permanganate was slowly added to the mixed acid, then the temperature was raised to 35°C, and the mixed solution was stirred, and reacted for 2 hours. After the reaction was completed, 20ml of 10wt % hydrogen peroxide solution to remove excess potassium permanganate. The obtained mixed solution was centrifuged at a speed of 8000 rpm for 20 minutes through a desktop high-speed centrifuge, and the precipitate was separated and collected. The obtained precipitate was diluted with 300 ml of ...
Embodiment 2
[0059] Step one, step two, step three and step five of the preparation method of the graphene-boron nitride composite material of embodiment 2 are respectively the step one and step two of the preparation method of the graphene-boron nitride composite material of embodiment 1 , step three and step five are the same, the only difference is that the mass ratio of graphene oxide and hexagonal boron nitride total mass to dopamine in step four of embodiment 2 is different.
[0060] Step 4 of Example 2: adding the graphene oxide, the boron nitride and dopamine into the TRIS buffer solution for reaction to prepare a graphene oxide-boron nitride composite material with polydopamine as a bridge molecule.
[0061] Add 90 mg of graphene oxide and 10 mg of hexagonal boron nitride with thinner sheets into 100 ml of TRIS buffer solution, and ultrasonicate for 30 min to obtain a uniformly dispersed mixed solution. Add 20mg of dopamine into the mixed solution, sonicate for 10min in an ice bat...
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