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Recently, Bafekry et al. [Appl. Phys. Lett. 120, 189901 (2022)] reportedtheir density functional theory (DFT) results on the elastic constants of C6N7monolayer. They predicted non-zero elastic constants along the out-of-planedirection for a single-layered material, which contradicts with basic physicsof the stiffness tensor for plane stress condition. Moreover, in their workYoung's modulus is erroneously calculated. On the basis of DFT calculations,herein we predicted the C11, C12 and C66 of the C6N7 monolayer to be 286, 73and 107 GPa, respectively, equivalent with an in-plane Youngs modulus of 267GPa. Using DFT calculations and a machine learning interatomic potential, wealso show that C6N7 monolayer shows isotropic elasticity.

applied physics letters

Comment on 'Erratum: 'Two-dimensional porous graphitic carbon nitride  C6N7 monolayer: First-principles calculations' [Appl. Phys. Lett. 119, 142102  (2021)]'