▎ 摘　　要

NOVELTY - Three-dimensional porous graphene skeleton-single-wall carbon nanotube flexible composite material is flexible self-supporting composite with graded porous structure obtained by one-step chemical vapor deposition, is claimed. USE - The three-dimensional porous graphene skeleton-single-wall carbon nanotube flexible composite material is useful as flexible electronic materials. ADVANTAGE - The composite material: has good support, strengthen, mechanical lightness and flexibility; and preparation method is simple to operate and economical, adjusts content of single-walled carbon nanotubes and inhibits agglomeration of single-walled carbon nanotubes and graphene sheets, does not need any binder simple operation and requires simple equipment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing three-dimensional porous graphene skeleton-single-wall carbon nanotube flexible composite material comprises (i) adding 3-6 g nano copper powder (200-2000 nm in diameter) and 0.5-10 mg single-walled carbon nanotube powder into 50 ml closed agate cans filled with inert gas (nitrogen or argon), fixing them in a ball mill, ball milling at 400-800 revolutions/minute for 4-10 hours, placing ball-milled single-walled carbon nanotube-nano-copper powder composite in a square mold (2x 2 cm2), utilizing a powder tablet press to press the powder into a self-supporting square block (2x 2x 0.2 cm3) at a pressure of 10-20 MPa which is used as a template for subsequent chemical vapor deposition; and (ii) adding self-supporting square block obtained in step (i) directly into a quartz tube furnace, maintaining the pressure in the tube at 500-8000 Pa, heating to 850-1050 degrees C at a speed of 10-30 degrees C/minute under the protection of high-purity argon (50-200 sccm), placing square template fully annealed for 20-60 minutes, taking methane (4-10 sccm) as a carbon source and hydrogen (10-20 sccm) as a reducing gas to perform a chemical vapor deposition reaction for 10-60 minutes, cooling to room temperature at the fastest speed, removing self-supporting square block with graphene deposited, placing it in 1-3 mol/l ferrous sulfate solution, allowing it at 60-100 degrees C for 6-48 hours until the sample floats on the surface of the solution, taking it out,1 utilizing dilute hydrochloric acid (1-3 M), concentrated nitric acid and deionized water to repeatedly wash, freeze drying, placing wall carbon nanotube-graphene framework in a quartz tube furnace and heating at 400-500 degrees C for 30-60 minutes under the protection of high-purity argon gas (10-100 sccm), pressing obtained aerogel into a tablet with a powder tableting machine, and fixing to a flexible conductive film with a conductive silver paste as a flexible electrode.