Negative Poisson's ratio in periodic porous graphene structures

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• 作者：Viet Hung Ho ; Duc Tam Ho ; Soon-Yong Kwon and Sung Youb Kim
• 刊名：physica status solidi (b)
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：253
• 期：7
• 页码：1303-1309
• 全文大小：3022K
• ISSN：1521-3951

文摘

We conducted molecular statics simulations to investigate the negative Poisson's ratio (auxetic behavior) of periodic porous graphene structures based on the rotating rigid unit mechanism. To obtain a negative Poisson's ratio, simple voids were periodically introduced into graphene. We showed that the Poisson's ratio of the designed graphene structure is strongly dependent on the aspect ratio of the voids, and it can approach the theoretical limit of −1.0. More importantly, the graphene periodic structure maintains its auxetic behavior even under large strains (ϵ ∼ 0.20). Hence, it can be employed in a wide range of applications requiring structures that can endure large deformation. In addition, we found that the key factor in the auxeticity of the investigated structures is the deformation occurring at the void tips.