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The nature of strength enhancement and weakening by pentagon-heptagon defects in graphene
文献类型：期刊论文
| 作者 | 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
|
| 刊名 | Nature Materials
 |
| 出版日期 | 2012-09 |
| 卷号 | 11期号:9页码:759-763 |
| 通讯作者邮箱 | Yujie_Wei@lnm.imech.ac.cn |
| 关键词 | CHEMICAL-VAPOR-DEPOSITION GRAIN-BOUNDARIES LARGE-AREA FILMS FIELD |
| ISSN号 | 1476-1122 |
| 通讯作者 | Wei, YJ ; Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China. |
| 合作状况 | 国际 |
| 中文摘要 | 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 |
| 学科主题 | 新型材料的力学问题 |
| 分类号 | 一类 |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.nature.com/nmat/journal/v11/n9/pdf/nmat3370.pdf |
| 语种 | 英语 |
| WOS记录号 | WOS:000308191700013 |
| 公开日期 | 2012-12-31 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/46051]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Wei, YJ |
| 推荐引用方式 GB/T 7714 | 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.,...&Wei, YJ.(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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来源：力学研究所
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