Single-layer Graphene is really really unstable and if you let it sit free, readily scrolls up and is very hard to get unstuck. In this sense, Landau’s impossibility proof is entirely correct.
And that’s why we don’t use free-standing graphene without a frame, for just about anything. The closest we get is graphene oxide dissolved in a liquid, or extremely extremely tiny platelets that don’t really deserve to be called crystals.
The pessimism about non-usefulness of graphene lay entirely in forgetting that you could put it on a backing or stretch it out (or thinking that it would lose its interesting properties if you did the former), and that was not justifiable at all.
Single-layer Graphene is really really unstable and if you let it sit free, readily scrolls up and is very hard to get unstuck. In this sense, Landau’s impossibility proof is entirely correct.
And that’s why we don’t use free-standing graphene without a frame, for just about anything. The closest we get is graphene oxide dissolved in a liquid, or extremely extremely tiny platelets that don’t really deserve to be called crystals.
The pessimism about non-usefulness of graphene lay entirely in forgetting that you could put it on a backing or stretch it out (or thinking that it would lose its interesting properties if you did the former), and that was not justifiable at all.