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Mechanical properties of two-dimensional materials and heterostructures

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Abstract

Mechanical properties are of fundamental importance in materials science and engineering, and have been playing a great role in various materials applications in the human history. Measurements of mechanical properties of 2-dimensional (2D) materials, however, are particularly challenging. Although various types of 2D materials have been intensively explored in recent years, the investigation of their mechanical properties lags much behind that of other properties, leading to lots of open questions and challenges in this research field. In this review, we first introduce the nanoindentation technique with atomic force microscopy to measure the elastic properties of graphene and 2D transition metal dichalcogenides. Then we review the effect of defects on mechanical properties of 2D materials, including studies on naturally defective chemical-vapor-deposited and intentionally defective 2D materials. Lastly, we introduce a nano-electromechanical device, resonators, built on the basis of the excellent mechanical properties of 2D materials.

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ACKNOWLEDGMENTS

J.W. acknowledges supports by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, and the NSF Center for Energy Efficient Electronics Science (NSF Award No. ECCS-0939514). K.L. acknowledges the support by “the Recruitment Program of Global Youth Experts (the Thousand Youth Talents Program).”

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Kai Liu

  2. Department of Materials Science and Engineering, University of California, Berkeley, California, 94720, USA

    Junqiao Wu

  3. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA

    Junqiao Wu

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  1. Kai Liu
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  2. Junqiao Wu
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Correspondence to Kai Liu or Junqiao Wu.

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Liu, K., Wu, J. Mechanical properties of two-dimensional materials and heterostructures. Journal of Materials Research 31, 832–844 (2016). https://doi.org/10.1557/jmr.2015.324

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