Measurement of the elastic properties and intrinsic strength of monolayer graphene
Measurement of the elastic properties and intrinsic strength of monolayer graphene
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DOI：
10.1126/science.1157996
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发表时间：
2008-07-18
期刊：
影响因子：
56.9
通讯作者：
Hone, James
中科院分区：
文献类型：
--
作者：
Lee, Changgu;Wei, Xiaoding;Hone, James
我们在原子力显微镜下通过纳米压痕测量了自支撑单层石墨烯膜的弹性性能和固有断裂强度。在非线性弹性应力-应变响应的框架内解释力-位移行为，并产生分别为340牛顿/米（Nm（-1））和-690 Nm（-1）的二阶和三阶弹性刚度。断裂强度为42 Nm（-1），代表无缺陷片材的固有强度。这些量对应于块状石墨的杨氏模量E = 1.0兆帕斯卡、三阶弹性刚度D = -2.0兆帕斯卡和固有强度σ（int）= 130吉帕斯卡。这些实验将石墨烯确立为有史以来最强的材料，并表明原子级完美的纳米级材料可以被机械测试到远远超出线性范围的变形。
We measured the elastic properties and intrinsic breaking strength of free-standing monolayer graphene membranes by nanoindentation in an atomic force microscope. The force-displacement behavior is interpreted within a framework of nonlinear elastic stress-strain response, and yields second- and third-order elastic stiffnesses of 340 newtons per meter (N m(-1)) and -690 N m(-1), respectively. The breaking strength is 42 N m(-1) and represents the intrinsic strength of a defect-free sheet. These quantities correspond to a Young's modulus of E = 1.0 terapascals, third-order elastic stiffness of D = -2.0 terapascals, and intrinsic strength of sigma(int) = 130 gigapascals for bulk graphite. These experiments establish graphene as the strongest material ever measured, and show that atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.