# What's an efficient way to produce graphite on TEM-Grids?

I am trying to produce graphene with few layers(<10) on a TEM-Grid. Until now I've been trying this with the scotch-tape-method with slight modifications. Unfortunately it requires a lot of time und there are often TEM-Grids without any flakes of the required thinness.

Is there a more efficient way to place graphene flakes having a size above $$150 \mu m * 150 \mu m$$ on a TEM-Grids? Is there a better quality of graphite blocks on the market than the SPI-1 quality?

-
Is the grid something you can change? I think there is no method of producing graphene other than this scotch tape business. –  Ron Maimon Jul 14 '12 at 3:32
I don't think that I can change the grid. I was hoping that someone could tell me ways improve the scotch tape method. –  Stein Jul 14 '12 at 10:13
My guess is that you have some van-der-Waal forces between the grid and the graphene, perhaps the grid is a metal, and this is preventing you from cleaving the planes using the tape. You can try pressing harder to get more stick on the tape, but I think you might be better off putting a doubly-sticky tape on the grid, and trying with two tapes. Maybe this will allow cleaving. I don't know why the tape method stopped working, but it's as good a guess as any. I hope this doesn't wreck the grid. –  Ron Maimon Jul 14 '12 at 16:52
Van-der-Waal forces are far to weak. I try to produce a reasonable flake by putting two stripes of scotch tape against each other and splitting the stripes again. In case that I've got a stripe with a good flake I glue it on a TEM-Grid using crystal bond. Then I can remove the tape, hoping that the bond holds the flake. The bond can be removed with acetone. The problem is, that it require a lot of work, before you see whether you've got a good flake. –  Stein Jul 14 '12 at 17:40
Like Ron, I believe that the tape method is the ever-so-sciency, cutting-edge method employed by most researchers in the field. You might try search the arXiv for some practical hints embedded in papers, but I find the easiest place to pick of this kind of practical advice is at conferences that these people attend. Talk to grad-students and post-docs. –  dmckee Jul 14 '12 at 18:13
It is extremely difficult to obtain the dimensions you require using the scotch-tape method. In my former group, even the student who was the best (in our group obviously) at using the scotch-tape method could go as far as 20-30 $\mu m$ long flakes. I am not aware of the world record for graphene flake sizes using this method. Our group, very soon, switched to the CVD method to produce large area graphene; we were successfully able to produce graphene on TEM grids using this method.