What do you mean with "How to take"? How to replicate similar results? Or finding an institute that can do it?
Most papers should write some ideas about the settings (energy, electron flux, etc.), as well as about grounding the samples, or what type of signal to measure for what type of contrast. Depending on the desired resolution or type of signal, you might need some time for good sample preparation and imaging.
Likely, you can contact someone with an SEM or TEM from an institution near you and probably they can help you with it or might even have experience with 2D materials already.
The actual SEM acquisition is normally not the issue, transferring graphene sheets in a controlled manner onto a substrate is generally very difficult.
For your Wikipedia example you can also see that it's folded which is not desirable for most applications.
Placing and contacting graphene sheets reproducibly are probably the main issues why graphene-based electronics haven't had their big breakthrough yet; if you find a really good method for that, you'll most likely become pretty rich.
I concur with Michael Rüsing and Jürgen Weippert. You need to spell out what your intent is, and that sample preparation is challenging.
I cannot tell for certain, but it looks like you may have layers of graphene or graphite below the sheets that we see on top. The texture looks the same throughout; everything seems to have a bit of roughness.
We have users in our lab that deposit graphene on Si chips. They too have problems with folding. It is not all that hard to get images like those. It seems the magnification is somewhere between 50 and 100kx.
I do advise users to coat their samples with 2 nm of iridium. Yes, the graphene is conductive, but carbon has a low secondary yield compared to iridium and similar metals. Ir is nice because it has a smaller grain size under similar conditions. Gold tends to form obvious islands.
- Badges
- Science topic
- Similar topics
- Filing