[2] Further calculations predicted that it is unstable in its pure form,[3] but can be stabilized by hydrogenation.

[1] Due to its atomic configuration, penta-graphene has an unusually negative Poisson’s ratio and very high ideal strength believed to exceed that of a similar material, graphene.

Contrary to graphene, which is a good conductor of electricity, penta-graphene is predicted to be an insulator with an indirect band gap of 4.1–4.3 eV.

It has a diamond-like structure with sp3 and no sp2 bonds, and therefore a wider band gap (ca.

[1] Chiral penta-graphene nanotubes have also been studied as metastable allotropes of carbon.