Abstract
Their mesoscopic dimensions (including a nanometer scale diameter and a micrometer scale length) make nanotubes a unique and attractive object of study, including the study of their mechanical properties and fracture in particular. The investigation of the mechanical properties of individual WS2 nanotubes is a challenging task due to their small size. Hence, various microscopy based techniques were used to overcome this challenge. The Young’s modulus was studied by techniques like atomic force microscope (AFM) and scanning electron microscope (SEM); it was also calculated by using the density-functional-based tight-binding (DFTB) method. Tensile tests and bending tests of individual WS2 nanotubes were performed as well. Furthermore, the shock wave resistance of these nanotubes was tested. The Young’s modulus of WS2 nanotubes was found to be in the range of 150–170 GPa, which is in good agreement with DFTB calculations. WS2 nanotubes also showed tensile strength as high as 16 GPa and fracture strain of 14%. These results indicate the high quality of these nanotubes which reach their theoretical strength. The interlayer shear (sliding) modulus was found to be ca. 2 GPa, this value is in good agreement with DFTB calculations. Moreover, the nanotubes were able to withstand shock waves as high as 21 GPa.
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Kaplan-Ashiri, I., Tenne, R. Mechanical Properties of WS2 Nanotubes. J Clust Sci 18, 549–563 (2007). https://doi.org/10.1007/s10876-007-0118-9
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DOI: https://doi.org/10.1007/s10876-007-0118-9