Revealing the Anomalous Tensile Properties of WS2 Nanotubes by in Situ Transmission Electron Microscopy
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- 作者：Dai-Ming Tang ; Xianlong Wei ; Ming-Sheng Wang ; Naoyuki Kawamoto ; Yoshio Bando ; Chunyi Zhi ; Masanori Mitome ; Alla Zak ; Reshef Tenne ; Dmitri Golberg
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：March 13, 2013
- 年：2013
- 卷：13
- 期：3
- 页码：1034-1040
- 全文大小：407K
- 年卷期：v.13,no.3(March 13, 2013)
- ISSN：1530-6992
文摘
Mechanical properties and fracture behaviors of multiwalled WS<sub>2sub> nanotubes produced by large scale fluidized bed method were investigated under uniaxial tension using in situ transmission electron microscopy probing; these were directly correlated to the nanotube atomic structures. The tubes with the average outer diameter 40 nm sustained tensile force of 2949 nN and revealed fracture strength of 11.8 GPa. Surprisingly, these rather thick WS<sub>2sub> nanotubes could bear much higher loadings than the thin WS<sub>2sub> nanotubes with almost 鈥渄efect-free鈥?structures studied previously. In addition, the fracture strength of the 鈥渢hick鈥?nanotubes did not show common size dependent degradation when the tube diameters increased from 20 to 60 nm. HRTEM characterizations and real time observations revealed that the anomalous tensile properties are related to the intershell cross-linking and geometric constraints from the inverted cone-shaped tube cap structures, which resulted in the multishell loading and fracturing.