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Size Effects on the Mechanical Properties of Nanoporous Graphene Networks

机译：尺寸对纳米多孔石墨烯网络力学性能的影响

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摘要

It is essential to understand the size scaling effects on the mechanical properties of graphene networks to realize the potential mechanical applications of graphene assemblies. Here, a highly dense-yet-nanoporous graphene monolith (HPGM) is used as a model material of graphene networks to investigate the dependence of mechanical properties on the intrinsic interplanar interactions and the extrinsic specimen size effects. The interactions between graphene sheets could be enhanced by heat treatment and the plastic HPGM is transformed into a highly elastic network. A strong size effect is revealed by in situ compression of micro- and nanopillars inside electron microscopes. Both the modulus and strength are drastically increased as the specimen size reduces to approximate to 100 nm, because of the reduced weak links in a small volume. Molecular dynamics simulations reveal the deformation mechanism involving slip-stick sliding, bending, buckling of graphene sheets, collapsing, and densification of graphene cells. In addition, a size-dependent brittle-to-ductile transition of the HPGM nanopillars is discovered and understood by the competition between volumetric deformation energy and critical dilation energy.
机译：必须了解尺寸缩放对石墨烯网络的机械性能的影响，以实现石墨烯组件的潜在机械应用。在这里，高度致密的纳米多孔石墨烯整料（HPGM）被用作石墨烯网络的模型材料，以研究机械性能对内在平面相互作用和外部试样尺寸效应的依赖性。石墨烯片之间的相互作用可以通过热处理来增强，并且塑料HPGM转变为高弹性网络。电子显微镜内部对微柱和纳米柱的原位压缩显示出强大的尺寸效应。随着样品尺寸减小到大约100 nm，模量和强度都急剧增加，这是因为小体积中的弱连接减少了。分子动力学模拟揭示了变形机制，包括滑移，弯曲，石墨烯片的屈曲，石墨烯细胞的塌陷和致密化。此外，通过体积变形能和临界膨胀能之间的竞争，发现并理解了HPGM纳米柱的尺寸相关的脆性到延性转变。

著录项

  • 来源
    《Advanced Functional Materials》 |2019年第19期|1900311.1-1900311.10|共10页
  • 作者

    Tang Doi-Ming; Ren Cui-Lan; Zhang Ling; Tao Ying; Zhang Peng; Lv Wei; Jia Xiang-Ling; Jiang Xiaojuan; Zhou Guangmin; Ohmura Takahito; Huai Ping; Li Feng; Bando Yoshio; Golberg Dmitri; Yang Quan-Hong;

  • 作者单位

    NIMS, Namiki 1-1 & Sengen 1-2-1, Tsukuba, Ibaraki 3050044, Japan;

    Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China|Chinese Acad Sci, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China;

    Chongqing Univ, Coll Mat Sci & Engn, Electron Microscopy Ctr, Shazhengjie 174, Chongqing 400044, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Nanoyang Grp, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China;

    Tsinghua Univ, Grad Sch Shenzhen, Engn Lab Functionalized Carbon Mat, Shenzhen Key Lab Graphene Based Mat, Shenzhen 518055, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Nanoyang Grp, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China;

    Chongqing Univ, Coll Mat Sci & Engn, Electron Microscopy Ctr, Shazhengjie 174, Chongqing 400044, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China;

    NIMS, Namiki 1-1 & Sengen 1-2-1, Tsukuba, Ibaraki 3050044, Japan;

    Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China|Chinese Acad Sci, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China|ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China;

    NIMS, Namiki 1-1 & Sengen 1-2-1, Tsukuba, Ibaraki 3050044, Japan|Univ Wollongong, Australian Inst Innovat Mat, Squires Way, North Wollongong, NSW 2500, Australia|Tianjin Univ, Inst Mol Plus, 92 Weijin Rd, Tianjin 300072, Peoples R China;

    NIMS, Namiki 1-1 & Sengen 1-2-1, Tsukuba, Ibaraki 3050044, Japan|QUT, Sch Chem Phys & Mech Engn, 2 George St, Brisbane, Qld 4000, Australia;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Nanoyang Grp, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    3D assembly; graphene; in situ electron microscopy; mechanical properties; nanoindentation; size effects;

    机译：3D组装;石墨烯;原位电子显微镜;力学性能;纳米压痕;尺寸效应;

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