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Theoretical strength and rubber-like behaviour in micro-sized pyrolytic carbon
时间:2019-09-12 14:51:24
作品信息

期刊

Nature Nanotechnology 

标题

Theoretical strength and rubber-like behaviour in micro-sized pyrolytic carbon

作者

Xuan Zhang, Lei Zhong, Arturo Mateos, Akira Kudo, Andrey Vyatskikh, Huajian Gao, Julia R. Greer, Xiaoyan Li 

摘要

The creation of materials with a combination of high strength, substantial deformability and ductility, large elastic limit and low density represents a long-standing challenge, because these properties are, in general, mutually exclusive. Using a combination of two-photon lithography and high-temperature pyrolysis, we have created micro-sized pyrolytic carbon with a tensile strength of 1.60 ± 0.55 GPa, a compressive strength approaching the theoretical limit of ~13.7 GPa, a substantial elastic limit of 20–30% and a low density of ~1.4 g cm−3. This corresponds to a specific compressive strength of 9.79 GPa cm3 g−1, a value that surpasses that of nearly all existing structural materials. Pillars with diameters below 2.3 μm exhibit rubber-like behaviour and sustain a compressive strain of ~50% without catastrophic failure; larger ones exhibit brittle fracture at a strain of ~20%. Large-scale atomistic simulations reveal that this combination of beneficial mechanical properties is enabled by the local deformation of 1 nm curled graphene fragments within the pyrolytic carbon microstructure, the interactions among neighbouring fragments and the presence of covalent carbon–carbon bonds.

原文链接

https://www.nature.com/nnano/volumes/14/issues/8

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