▎ 摘　　要

NOVELTY - Preparing graphene sheet using femtosecond laser comprises (a) taking the e.g. graphite powder and ferric chloride into the water, spraying on the quartz plate by electrostatic spraying, scraping on plate in the same direction to repeatedly coating to obtain a thick film, (b) taking the obtained thick film, placing into a drying tank, and (c) crushing the dried thick film obtained into a femtosecond laser chamber, where two femtosecond laser beams vertical to the dried thick film face scan rate larger than the dried thick film surface is 5-10 degrees include angle scan rate. USE - The method is useful for preparing graphene sheet using femtosecond laser (claimed). ADVANTAGE - The method is simple, easy to control and economical. DETAILED DESCRIPTION - Preparing graphene sheet using femtosecond laser comprises (a) taking the graphite powder and adhesive carbon source material, ferric chloride, butyl benzene latex in a mass ratio of 100:3-5:0.5-1:1-3 as a viscous liquid into the water, spraying on the quartz plate by electrostatic spraying, scraping on plate in the same direction to repeatedly coating, repeating scraping in the graphite layer arranged direction of spraying, circulating electrostatic spraying, scraping plate coating, graphite layer direction and stacking to obtain a thick film, (b) taking the obtained thick film in under the pressure of 0.08-0.1 MPa, placing into a drying tank, under the condition at 80-100 degrees C for 15-25 minutes, forming a dry thick film with a basis weight is 200-500 g/m2, and (c) crushing the dried thick film obtained into a femtosecond laser chamber, where the femtosecond laser chamber set two directions of femtosecond laser beam scanning, a beam is along the direction vertical to the dried thick film surface scan bombardment, graphite layer and carbon source, butyl benzene latex femtosecond bombardment orientation carbonization reaction, where the graphite is large-area graphite layer, other beam and drying the thick film surface is 5-10 degrees include angle scan bombardment, where the femtosecond laser generating continuous high energy oscillation, where the large area graphite delamination, collecting by air blowing to form a large sheet size graphene, where two femtosecond laser beams vertical to the dried thick film face scan rate larger than the dried thick film surface is 5-10 degrees include angle scan rate.