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Mechanical properties of freely suspended semiconducting graphene-like layers based on MoS2

Andres Castellanos-Gomez12*, Menno Poot14, Gary A Steele1, Herre SJ van der Zant1, Nicolás Agraït23 and Gabino Rubio-Bollinger2

Author affiliations

1 Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628, CJ, The Netherlands

2 Departamento de Física de la Materia Condensada (C-III), Universidad Autónoma de Madrid, Campus de Cantoblanco, Madrid E-28049, Spain

3 Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Madrid E-28049, Spain

4 Department of Engineering Science, Yale University, Becton 215, 15 Prospect St., New Haven, CT 06520, USA

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Citation and License

Nanoscale Research Letters 2012, 7:233  doi:10.1186/1556-276X-7-233

Published: 25 April 2012

Abstract

We fabricate freely suspended nanosheets of molybdenum disulphide (MoS2) which are characterized by quantitative optical microscopy and high-resolution friction force microscopy. We study the elastic deformation of freely suspended nanosheets of MoS2 using an atomic force microscope. The Young's modulus and the initial pre-tension of the nanosheets are determined by performing a nanoscopic version of a bending test experiment. MoS2 sheets show high elasticity and an extremely high Young's modulus (0.30 TPa, 50% larger than steel). These results make them a potential alternative to graphene in applications requiring flexible semiconductor materials.

PACS, 73.61.Le, other inorganic semiconductors, 68.65.Ac, multilayers, 62.20.de, elastic moduli, 81.40.Jj, elasticity and anelasticity, stress-strain relations.

Keywords:
Molybdenum disulfide nanosheets; Freely suspended; Mechanical properties; Atomically thin crystal; Mechanical exfoliation