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Title: The nature of strength enhancement and weakening by pentagon-heptagon defects in graphene
Author: Wei YJ(魏宇杰); Wu JT(吴江涛); Yin HQ(尹汗青); Shi XH(施兴华); Yang RG; Dresselhaus M
Source: Nature Materials
Issued Date: 2012-09
Volume: 11, Issue:9, Pages:759-763
Abstract: 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
Keyword: CHEMICAL-VAPOR-DEPOSITION ; GRAIN-BOUNDARIES ; LARGE-AREA ; FILMS ; FIELD
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Wei, YJ ; Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Correspondent Email: Yujie_Wei@lnm.imech.ac.cn
Related URLs: 查看原文
DOC Type: Article
WOS ID: WOS:000308191700013
ISSN: 1476-1122
Subject: 固体力学::新型材料的力学问题
Department: LNM微结构计算力学(筹)
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/46051
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
魏宇杰; Wu JT; Yin HQ; Shi XH; Yang RG; Dresselhaus M.The nature of strength enhancement and weakening by pentagon–heptagon defects in graphene[J].NATURE MATERIALS,2012,11(9):759-763 .
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