The normal-auxeticity mechanical phase transition in graphene

Deng, Binghui, Hou, Jie, Zhu, Hanxing ORCID: https://orcid.org/0000-0002-3209-6831, Liu, Sheng, Liu, Emily, Shi, Yunfeng and Peng, Qing 2017. The normal-auxeticity mechanical phase transition in graphene. 2D Materials 4 (2) , 021020. 10.1088/2053-1583/aa61e5

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Abstract

When a solid object is stretched, in general, it shrinks transversely. However, the abnormal ones are auxetic, which exhibit lateral expansion, or negative Poisson ratio. While graphene is a paradigm 2D material, surprisingly, graphene converts from normal to auxetic at certain strains. Here, we show via molecular dynamics simulations that the normal-auxeticity mechanical phase transition only occurs in uniaxial tension along the armchair direction or the nearest neighbor direction. Such a characteristic persists at temperatures up to 2400 K. Besides monolayer, bilayer and multi-layer graphene also possess such a normal-auxeticity transition. This unique property could extend the applications of graphene to new horizons.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Publisher:	IOP Publishing
ISSN:	2053-1583
Date of First Compliant Deposit:	13 March 2017
Date of Acceptance:	21 February 2017
Last Modified:	05 May 2023 05:54
URI:	https://orca.cardiff.ac.uk/id/eprint/98922

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