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Research Article | Open Access

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( ), Lian Mao Peng1
Key Laboratory on the Physics and Chemistry of Nanodevices and Department of ElectronicsPeking UniversityBeijing100871China
Department of Materials and InterfacesWeizmann Institute of ScienceRehovot76100Israel
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Abstract

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-field-induced resonance of these nanotubes.

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Keywords

Inorganic nanotubesnanomechanicsTEMSEM

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Nano Research
Volume 1 Issue 1,
January 2008
Pages 22-31
DOI: 10.1007/s12274-008-8008-5

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Wang MS, Kaplan-Ashiri I, Wei XL, et al. In Situ TEM Measurements of the Mechanical Properties and Behavior of WS2 Nanotubes. Nano Research, 2008, 1(1): 22-31. https://doi.org/10.1007/s12274-008-8008-5

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Received: 28 April 2008
Revised: 25 May 2008
Accepted: 25 May 2008
Published: 12 July 2008
© Tsinghua Press and Springer-Verlag 2008