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The normal-auxeticity mechanical phase transition in graphene

Deng, Binghui, Hou, Jie, Zhu, Hanxing, 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: 04 Jun 2017 09:44
URI: http://orca.cf.ac.uk/id/eprint/98922

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