Recently, a new theoretical material with relativistic properties has been mentioned, which is graphyne. Now, simulations reported in Phys. Rev. Lett. 108, 086804 (2012) show possible better properties than graphene. Someone of you have worked in this topic? (and someone has the article and can share it?)
I'm 99% sure that such material is pure hypothetical and can't be obtained in experiment. The carbyne carbon chains are very reactive and therefore can easily bind with everything. This is the answer why carbyne is unstable at room temperature, it degrades to amorphous carbon.
But, when you use energy criteria you can obtain that graphyne is stable. Maybe, we can think that is difficult to synthesize but not impossible. Or what do you think about predictions with ab initio models?
I think that in computer simulations we can predict a lot of interesting stuff which in principle can exists but they surviving in nature is improbable. Simulations predict existence of local energy minimum structures, some of the them can exist, some of them not. We should consider any prediction with scepticism and use our scientific intuition to for avoiding mistakes.
Nothing is impossible...one day graphene was also impossible and was merely a theoretical entity..but then the gold rush began when it was merely the wisdom of Novoselov and Geim which has given such a wonderful material.
I love simulation results when we can realize and prove them experimentally until then they stay as hypotheses.
Carbyne has one stable form - "oriented carbyne". Is synthesized by the Russians since 1992. It is stabilized at the ends by hydrogen and stable up to temperatures of the order of 1000 K. There are a number of publications about it.
Article Oriented carbyne layers
Article Superinjection from Oriented Carbyne as the Result of Landau...
It was synthesized even early. in ~ 1960s by Kasatochkin et al. (V. I. Kasatochkin et al. (1967). Doklady Chemistry 177: 1031)
Don't confuse "carbyne" and "oriented carbyne". I didn't work with Sladkov's carbyne (who is the inventor of the carbyne). I know only one stable form (synthesized by N.D.Novikov in 1992) - I can prove its stability in MALDI. The mass spectra clearly shows that it is not a pure carbon form - the ends of chains bonded with hydrogen.
Yes, carbon chain should have something on the ends, they highly reactive. Actually it seems that all chain's "surface" is chemically not very stable, due this chain can exist in the free form only at high temperature
There are the samples of o.carbyne, which are 10 years old - and they have not changed. They were subjected to high current and temperature ..
Maybe it is a reason of the specific structure of the samples. There is a paper about stability of the carbyne net where was shown that it degrades to the sp2 carbon.
http://dx.doi.org/10.1103/PhysRevB.69.075422
As I wrote above - only oriented form is stable. It looks like all the others are degrading. By the way, there are samples containing natural carbyne, which many tens of thousands of years.
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