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bingan727

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[资源] 石墨烯和单层MoS2微观机械性能测试(Science,Nano Letter和ACS Nano)

第一篇文章是2008年Science上利用原子力显微镜测试石墨烯的机械性能。
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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 sint = 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.
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第二篇文章是加州理工大学的Mingyuan Huang博士在Julia R. Greer教授指导下利用原位纳米压痕技术对石墨烯的电机耦合性能的研究。
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We present the in situ nanoindentation experiments performed on suspended graphene devices to introduce homogeneous tensile strain, while simultaneously carrying out electrical measurements.We find that the electrical resistance shows only a marginal change even under severe strain, and the electronic transport measurement confirms that there is no band gap opening for graphene under
moderate uniform strain, which is consistent with our results from the first-principles informed molecular dynamics simulation.
石墨烯电机耦合性能
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第三篇文章是瑞士一个课题组报道了他们利用原子力显微镜（ＡＦＭ）对单层ＭｏＳ２的机械性能展开的研究。
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We report on measurements of the stiffness and breaking strength of monolayer MoS2, a new semiconducting analogue of graphene. Single and bilayer MoS2 is exfoliated from bulk and transferred to a substrate containing an array of microfabricated circular holes. The resulting suspended, free-standing membranes are deformed and eventually broken using an atomic force microscope. We find that the in-plane stiffness of monolayer MoS2 is 180 ( 60 Nm1, corresponding to an effective Young's modulus of 270(100 GPa, which is comparable to that of steel. Breaking occurs at an effective strain between 6 and 11% with the average breaking strength of 15(3 Nm1 (23 GPa). The strength of strongest monolayer membranes is 11% of its Young's modulus, corresponding to the upper theoretical limit which indicates that the material can be highly crystalline and almost defect-free. Our results show that monolayer MoS2 could be suitable for a variety of applications such as reinforcing elements in composites and for fabrication of flexible electronic devices.
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单层MoS2机械性能测试[ Last edited by bingan727 on 2012-1-6 at 01:29 ]

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附件 1 : Graphene electronic-mechanical coupling nanoindentation.pdf

2012-01-06 12:31:16, 894.28 K

附件 2 : Stretch MoS2.pdf

2012-01-06 12:31:36, 3.21 M

附件 3 : Graphene mechanical properties-Science Magazine.pdf

2012-01-06 15:24:52, 443.71 K

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