Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene
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- Changgu Lee
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA.
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- Xiaoding Wei
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA.
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- Jeffrey W. Kysar
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA.
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- James Hone
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA.
書誌事項
- 公開日
- 2008-07-18
- DOI
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- 10.1126/science.1157996
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:p> 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 <jats:sup>–1</jats:sup> ) and –690 Nm <jats:sup>–1</jats:sup> , respectively. The breaking strength is 42 N m <jats:sup>–1</jats:sup> and represents the intrinsic strength of a defect-free sheet. These quantities correspond to a Young's modulus of <jats:italic>E</jats:italic> = 1.0 terapascals, third-order elastic stiffness of <jats:italic>D</jats:italic> = –2.0 terapascals, and intrinsic strength of σ <jats:sub>int</jats:sub> = 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. </jats:p>
収録刊行物
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- Science
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Science 321 (5887), 385-388, 2008-07-18
American Association for the Advancement of Science (AAAS)
