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The nature of strength enhancement and weakening by pentagon-heptagon defects in graphene
Wei YJ(魏宇杰); Wu JT(吴江涛); Yin HQ(尹汗青); Shi XH(施兴华); Yang RG; Dresselhaus M; Wei, YJ; Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
2012-09
发表期刊Nature Materials
卷号11期号:9页码:759-763
ISSN1476-1122
摘要The two-dimensional crystalline structures in graphene challenge the applicability of existing theories that have been used for characterizing its three-dimensional counterparts. It is crucial to establish reliable structure-property relationships in the important two-dimensional crystals to fully use their remarkable properties. With the success in synthesizing large-area polycrystalline graphene(1-5), understanding how grain boundaries (GBs) in graphene(2-4) alter its physical properties(5-13) is of both scientific and technological importance. A recent work showed that more GB defects could counter intuitively give rise to higher strength in tilt GBs (ref. 10). We show here that GB strength can either increase or decrease with the tilt, and the behaviour can be explained well by continuum mechanics. It is not just the density of defects that affects the mechanical properties, but the detailed arrangements of defects are also important. The strengths of tilt GBs increase as the square of the tilt angles if pentagon-heptagon defects are evenly spaced, and the trend breaks down in other cases. We find that mechanical failure always starts from the bond shared by hexagon-heptagon rings. Our present work provides fundamental guidance towards understanding how defects interact in two-dimensional crystals, which is important for using high-strength and stretchable graphene(14) for biological and electronic
关键词Chemical-vapor-deposition Grain-boundaries Large-area Films Field
学科领域新型材料的力学问题
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收录类别SCI ; EI
语种英语
WOS记录号WOS:000308191700013
课题组名称LNM微结构计算力学(筹)
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被引频次:278[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/46051
专题非线性力学国家重点实验室
通讯作者Wei, YJ; Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
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Wei YJ,Wu JT,Yin HQ,et al. The nature of strength enhancement and weakening by pentagon-heptagon defects in graphene[J]. Nature Materials,2012,11(9):759-763.
APA Wei YJ.,Wu JT.,Yin HQ.,Shi XH.,Yang RG.,...&Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China..(2012).The nature of strength enhancement and weakening by pentagon-heptagon defects in graphene.Nature Materials,11(9),759-763.
MLA Wei YJ,et al."The nature of strength enhancement and weakening by pentagon-heptagon defects in graphene".Nature Materials 11.9(2012):759-763.
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