- #1
ilpremio
- 2
- 0
Hey everyone,
So I've been doing research in graphene for a semester and my colleague and I have had no luck making graphene samples.
We are using the "scotch-tape" method on Kish graphite. We use a small piece of one flake to put on weak tape (we find that the Magic Tape is too strong and results in too much glue on the substrate) and peel repeatedly until we see a faint, gray cloud on the tape. We then put the Si wafer (SiO2 down) on the tape and peel off with the tweezer.
Our results are never good. We see a few small flakes of graphene (less than 5micron in length) and maybe one or at most two nice big pieces (greater than 10micron). This yield is not enough for us. We'd like to have at least 5 potential graphene flakes greater than 10micron per wafer. Also we get a lot of really thick chunks of graphite and glue on the substrate which hinders making good finger contacts. We've tried cleaning with acetone, methanol and isopropanol but it doesn't clean it enough.
Does anyone have any suggestions as to how to make this process better? We've gone through so many papers but they never give you the details. Any insight would be GREATLY appreciated!
:-)
So I've been doing research in graphene for a semester and my colleague and I have had no luck making graphene samples.
We are using the "scotch-tape" method on Kish graphite. We use a small piece of one flake to put on weak tape (we find that the Magic Tape is too strong and results in too much glue on the substrate) and peel repeatedly until we see a faint, gray cloud on the tape. We then put the Si wafer (SiO2 down) on the tape and peel off with the tweezer.
Our results are never good. We see a few small flakes of graphene (less than 5micron in length) and maybe one or at most two nice big pieces (greater than 10micron). This yield is not enough for us. We'd like to have at least 5 potential graphene flakes greater than 10micron per wafer. Also we get a lot of really thick chunks of graphite and glue on the substrate which hinders making good finger contacts. We've tried cleaning with acetone, methanol and isopropanol but it doesn't clean it enough.
Does anyone have any suggestions as to how to make this process better? We've gone through so many papers but they never give you the details. Any insight would be GREATLY appreciated!
:-)