Research Article


2008, 1: 22-31


In Situ TEM Measurements of the Mechanical Properties and Behavior of WS2 Nanotubes

Ming Sheng Wang1, Ifat Kaplan-Ashiri2, Xian Long Wei1, Rita Rosentsveig2, Hanoch Daniel Wagner2, Reshef Tenne2), and Lian Mao Peng1

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1 Key Laboratory on the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China
2 Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel

Keywords: Inorganic nanotubes, nanomechanics, TEM, SEM
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  • Abstract
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The mechanical properties of individual WS2 nanotubes were investigated and directly related to their atomic structure details by in situ transmission electron microscope measurements. A brittle mode deformation was observed in bending tests of short (ca. 1 μm in length) multilayer nanotubes. This mode can be related to the atomic structure of their shells. In addition, longer nanotubes (6 7μm in length) were deformed in situ scanning electron microscope, but no plastic deformation was detected. A “sword-in-sheath” fracture mechanism was revealed in tensile loading of a nanotube, and the sliding of inner shells inside the outermost shell was imaged “on-line”. Furthermore, bending modulus of 217 GPa was obtained from measurements of the electric-fi eldinduced resonance of these nanotubes.
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In Situ TEM Measurements of the Mechanical Properties and Behavior of WS2 Nanotubes. Nano Res. 2008, 1: 22-31

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