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Title: Cohesion Energetics of Carbon Allotropes: Quantum Monte Carlo Study

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4867544· OSTI ID:1123575

We have performed quantum Monte Carlo calculations to study the cohesionenergetics of carbon allotropes, including sp3-bonded diamond, sp2-bondedgraphene, sp-sp2 hybridized graphynes, and sp-bonded carbyne. The comput- edcohesive energies of diamond and graphene are found to be in excellentagreement with the corresponding values de- termined experimentally for diamondand graphite, respectively, when the zero-point energies, along with theinterlayer binding in the case of graphite, are included. We have also foundthat the cohesive energy of graphyne decreases system- atically as the ratio ofsp-bonded carbon atoms increases. The cohesive energy of γ-graphyne, the mostenergetically- stable graphyne, turns out to be 6.766(6) eV/atom, which issmaller than that of graphene by 0.698(12) eV/atom. Experi- mental difficultyin synthesizing graphynes could be explained by their significantly smallercohesive energies. Finally we conclude that the cohesive energy of anewly-proposed two-dimensional carbon network can be accurately estimated withthe carbon-carbon bond energies determined from the cohesive energies ofgraphene and three different graphynes.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1123575
Journal Information:
Journal of Chemical Physics, Vol. 140, Issue 11; ISSN 0021-9606
Country of Publication:
United States
Language:
English

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