Application: Flexible batteries, Electronics, Aerospace industry, MEMS and NEMS, Microactuators, Conductive coatings, Research

Morphology: Transparent thin layer on copper

Uses: Materials: 1M~2M FeCl3, acetone, deionized water, plastic dropper, tweezers Steps: 1, Prepare two glass culture dishes, each with FeCl3 solution. Hold the sample with a pair of tweezers and place it gently on the surface of FeCl3 solution. The Cu side is in contact with the solution and the surface coated with PMMA is facing up. 2, After 3 minutes of corrosion, clamp a corner of the sample with tweezers and lift the sample vertically from the dish. Pipette the FeCl3 solution with a plastic dropper, rinse three times of the side of the sample that has been corroded(If the first removal is not clean, you can etch for another two minutes after the first corrosion, repeat the rinse once). 3, Gently spread the rinsed sample on the surface of the second culture dish solution. After about 1 hour, the copper was completely etched away. It can be seen that the PMMA film floated on the surface of the solution, and the graphene was on the lower surface of the PMMA film. 4, Picke up the sample from the bottom up using a glass slide and placed in a dish containing deionized water to remove the remaining FeCl3 solution. Repeat three times and using the fresh water for 10 minutes each time(The residue of FeCl3 can be substantially removed after washing three times). 5, Use the substrate you need to pick up the graphene film from the bottom up and put the graphene film in the center of the substrate. Then, keep the sample upright to let the residual water drip. The sample is then placed nearly vertically on the water-absorbing material and dry naturally. 6, After naturally drying, place the sample in 90 centigrade oven or hot stage (110 centigrade) for about 1 hour to let the graphene and the substrate attached closely. 7, After cooled, put the sample in acetone solution to remove PMMA. Repeat three times. Using the fresh acetone each time for 30 minutes (Heating the acetone to 50 degrees can save half time. Heating the acetone also helps to completely remove the pmma, but may cause more graphene damage defects). 8, Remove the sample and let the surface acetone evaporate clean. The sample can be taken for storage. Please put in the oven for 90 centigrade for a half hours before use to remove the attached water molecules.