Density dependence of elastic properties of graphynes

Abstract

Graphyne is a two-dimensional carbon allotrope of graphene. Its structure is composed of aromatic rings and/or carbon-carbon bonds connected by one or more acetylene chains. As some graphynes present the most of the excellent properties of graphene and non-null bandgap, they have been extensively studied. Recently, Kanegae and Fonseca reported calculations of four elastic properties of 70 graphynes, ten members of the seven families of graphynes [Carbon Trends 7, 100152 (2022)]. They showed that the acetylene chain length dependence of these properties can be simply modelled by a serial association of springs. Here, based on those results, we present the density dependence of these properties and show that the elastic moduli, $E$, of graphyne are less dependent on density, $\rho$, than porous cellular materials with an exponent of $E\sim {\rho }^n$, smaller than 2. We discuss the results in terms of the shape of the pores of the graphyne structures.

Submitted version of the paper accepted for publication in MRS Advances

References in corpus (2)

• Scalable synthesis and characterization of multilayer $\gamma$-graphyne, new carbon crystals with a small direct bandgap
• Effective acetylene length dependence of the elastic properties of different kinds of graphynes

Cited by in corpus (3)

• A Concise Review of Recently Synthesized 2D Carbon Allotropes: Amorphous Carbon, Graphynes, Biphenylene and Fullerene Networks
• Angular Dependence of Four Mechanical Properties of Graphynes
• Length and torsion dependence of thermal conductivity in twisted graphene nanoribbons