Predicted penta-graphene falls flat


penta-graphene

© Shutterstock

An international group of scientists has ruled out the possibility that penta-graphene, a two-dimensional carbon layer made exclusively from pentagons, will ever exist. The team has also produced a set of criteria that all future carbon allotrope predictions should be measured against.

Earlier this year, scientists from China predicted the existence of penta-graphene. Qian Wang and her colleagues from Peking University used computer simulations to create the exotic allotrope and suggested it could be synthesised from single T12-carbon sheets.

But Christopher Ewels from the University of Nantes, France, and his colleagues, including the Nobel prize winner Harry Kroto, have cast doubt on Wang’s prediction. Using density functional calculations, the team analysed penta-graphene for its chemical stability and whether it could be distinguished from isomers with similar energies. According to the simulation, penta-graphene would rapidly transform into the more stable hexagonal form in the presence of any impurities.

References

C P Ewels et al, Proc. Natl. Acad. Sci. USA, 2015, DOI: 10.1073/pnas.1520402112


Related Content

Calculations predict pentagonal graphene

11 February 2015 Research

news image

New carbon allotrope could have interesting physical and electrical properties

Rewriting the textbooks with a pinch of salt

23 February 2016 Research

news image

Chlorine atoms in the –2 oxidation state, and other high pressure-induced oddities, predicted using new model

Most Commented

Ethanol to butanol conversion shows sustainable potential

13 January 2016 Research

news image

Borrowed hydrogen chemistry drives reaction to obtain useful fuel from biomass

Israeli chemists urge government to ban chemical weapons

21 July 2016 News and Analysis

news image

Open letter presses prime minister to ‘remove the curse of chemical weapons from the face of the Earth’