▎ 摘　　要

NOVELTY - Seamlessly transferring graphene involves (a) taking a sample of graphene/copper foil substrate made by chemical vapor deposition (CVD) with quadrilateral shape, (b) taking a sample of paper with a smooth surface and covering on the surface of the graphene/copper foil substrate, using a flat glass sheet to gently pressing on the paper, then removing the glass sheet and paper, (c) placing the graphene/copper foil substrate on the spin coating machine, spin coating at a low speed of 900 rpm for 9 seconds, and then spin coating at a high speed of 3000 rpm for 30 seconds to obtain a layer of polymethyl methacrylate (PMMA) with a thickness of 250-300 nm, spin-coating on the graphene surface of the copper foil substrate to prepare a sample of PMMA/graphene/copper foil composite structure, (d) placing the sample on a hot plate, baking for 10-60 minutes at 80-150 degrees C, removing and cooling. USE - Seamlessly transferring graphene. ADVANTAGE - The method enables simple seamlessly transferring of graphene with high quality. DETAILED DESCRIPTION - Seamlessly transferring graphene involves (a) taking a sample of graphene/copper foil substrate made by chemical vapor deposition (CVD) with quadrilateral shape, (b) taking a sample of paper with a smooth surface and covering on the surface of the graphene/copper foil substrate, using a flat glass sheet to gently pressing on the paper, then removing the glass sheet and paper, (c) placing the graphene/copper foil substrate on the spin coating machine, spin coating at a low speed of 900 rpm for 9 seconds, and then spin coating at a high speed of 3000 rpm for 30 seconds to obtain a layer of polymethyl methacrylate (PMMA) with a thickness of 250-300 nm, spin-coating on the graphene surface of the copper foil substrate to prepare a sample of PMMA/graphene/copper foil composite structure, (d) placing the sample on a hot plate, baking for 10-60 minutes at 80-150 degrees C, removing and cooling, (e) cutting four samples of tape with a width of 1 mm and paste them on the four sides of the PMMA surface of the sample respectively, in which one of the tapes is 2-3 mm from the edge of the sample, and the remaining three are flush with the edge of the sample; afterwards, leaving the PMMA glue 2-3 mm away with clean surg9cal scraping blade, (f) taking a sample of paper and a sample of glass and pressing the sample according to the step (b), (g) taking an electrolytic cell, configure 0.25 M sodium hydroxide solution as electrolyte, and connecting the negative surface of the copper foil to the negative electrode of the power supply through an alligator clip after scraping off PMMA, connecting the platinum electrode to the positive pole of the power supply, adjusting the power supply voltage to 3 V, current to 0.20 A, and complete peeling after 1-5 minutes of energization, after peeling, the graphene/PMMA film with tape frame floats on the electrolyte surface, and it is easy to distinguish the front and back, (h) using tweezers to hold the tape to removing the graphene/PMMA film from the electrolyte, and using the filter paper to absorbing the moisture on both sides of the graphene/PMMA, (i) selecting silicon dioxide/silicon as the target substrate, dripping isopropyl alcohol on the silicon dioxide/silicon target substrate, and then quickly attaching the graphene side of the graphene/PMMA film prepared in step (h) to the flatly adhered on the target substrate, (j) placing the target substrate with graphene/PMMA film on the heating plate, baking at 80-100 degrees C for 30 minutes, then using a surgical blade to gently scraping a circle around the sample and taking the adhesive tape, and (k) adding the target substrate with graphene/PMMA film obtained in the step (j) into hot acetone solution and soaking for 20 minutes, dissolving the PMMA film on the graphene, adhering the target substrate with graphene and taking out from the acetone solution and drying.