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arXiv 2302.09180cond-mat.mtrl-sci
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石墨烯弹性性质的密度依赖性

Density dependence of elastic properties of graphynes

Guilherme B. Kanegae, Alexandre F. Fonseca

摘要:

石墨烯是石墨烯的二维碳同素异形体。它的结构由一个或多个乙炔链连接的芳环和/或碳-碳键组成。由于某些石墨烯具有石墨烯的大部分优良性质和非零带隙,因此得到了广泛的研究。最近,Kanegae和Fonseca报道了70种石墨烯的四种弹性性质的计算,七种石墨烯家族的十个成员[Carbon Trends 7,100152(2022)]。他们表明,乙炔链长对这些性质的依赖性可以简单地用一系列弹簧来模拟。在这里,基于这些结果,我们提出了这些属性的密度依赖性,并表明石墨的弹性模量,$E$,是依赖于密度,$ρ$,比多孔蜂窝材料的指数$E \sim ρ^{n}$,小于2。我们讨论的结果方面的石墨结构的孔的形状。

英文摘要:

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, $ρ$, than porous cellular materials with an exponent of $E \sim ρ^{n}$, smaller than 2. We discuss the results in terms of the shape of the pores of the graphyne structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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