Graphene flower and method for manufacturing the same and composite material

1. A method of forming a graphene flower, comprising:

introducing a hydrocarbon gas and an assistance gas into a transformer-coupled plasma equipment; and

providing a medium-frequency electromagnetic wave to the hydrocarbon gas and the assistance gas by the transformer coupled plasma equipment to dissociate the hydrocarbon gas, and the dissociated hydrocarbon gas is re-combined to form the graphene flower,

wherein the hydrocarbon gas is dissociated at a ratio of greater than 95%,

wherein the medium frequency electromagnetic wave has a frequency of 100 kHz to 3 MHz.

2. The method as claimed in claim 1 , wherein the hydrocarbon gas is introduced at a flow rate of 0.05 slm to 25 slm.

3. The method as claimed in claim 1 , wherein the assistance gas is introduced at a flow rate of 1 slm to 50 slm.

4. The method as claimed in claim 1 , wherein a flow rate of the hydrocarbon gas and a flow rate of the assistance gas have a ratio of 1:20 to 1:2.

5. The method as claimed in claim 1 , wherein the hydrocarbon gas comprises methane, ethylene, acetylene, or a combination thereof.

6. The method as claimed in claim 1 , wherein the assistance gas comprises argon, helium, nitrogen, or a combination thereof.

7. The method as claimed in claim 1 , wherein the hydrocarbon gas and the assistance gas in the transformer-coupled plasma equipment have a pressure of 0.1 torr to 20 torr.

8. The method as claimed in claim 1 , wherein the step of providing the medium-frequency electromagnetic wave is performed with a power that is greater than 1 kW.

9. A graphene flower, comprising:

a plurality of graphene sheets arranged in a non-parallel manner and tangled with each other,

wherein the graphene flower has a profile free of a planar surface.

10. The graphene flower as claimed in claim 9 , having a diameter of 10 nm to 5 mm.

11. The graphene flower as claimed in claim 9 , wherein the graphene sheets have a curved structure or an irregular wrinkle structure.

12. A composite material, comprising:

100 parts by weight of metal powder; and

0.5 to 50 parts by weight of graphene flower,

wherein the graphene flower includes a plurality of graphene sheets arranged in a non-parallel manner and tangled with each other, and

wherein the graphene flower has a profile free of a planar surface.

13. The composite material as claimed in claim 12 , wherein the metal powder has a diameter of 5 nm to 50 μm.

14. The composite material as claimed in claim 12 , wherein the graphene flower has a diameter of 10 nm to 50 μm.

15. The composite material as claimed in claim 12 , wherein the graphene sheets have a curved structure or an irregular wrinkle structure.

16. The composite material as claimed in claim 12 , having a heat dissipation coefficient greater than that of the metal powder.

17. A composite material, comprising:

100 parts by weight of polymer powder or liquid; and

0.5 to 50 parts by weight of graphene flower,

wherein the graphene flower includes a plurality of graphene sheets arranged in a non-parallel manner and tangled with each other, and

wherein the graphene flower has a profile free of a planar surface.

18. The composite material as claimed in claim 17 , wherein the polymer powder has a diameter of 5 nm to 50 μm.

19. The composite material as claimed in claim 17 , wherein the graphene flower gas a diameter of 10 nm to 50 μm.

20. The composite material as claimed in claim 17 , wherein the graphene sheets have a curved structure or an irregular wrinkle structure.

21. The composite material as claimed in claim 17 , having a heat dissipation coefficient greater than that of the polymer powder or liquid.