Revealing the anomalous tensile properties of WS2 nanotubes by in situ transmission electron microscopy.
Nano Lett
; 13(3): 1034-40, 2013 Mar 13.
Article
em En
| MEDLINE
| ID: mdl-23421847
Mechanical properties and fracture behaviors of multiwalled WS2 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 â¼40 nm sustained tensile force of â¼2949 nN and revealed fracture strength of â¼11.8 GPa. Surprisingly, these rather thick WS2 nanotubes could bear much higher loadings than the thin WS2 nanotubes with almost "defect-free" structures studied previously. In addition, the fracture strength of the "thick" nanotubes did not show common size dependent degradation when the tube diameters increased from â¼20 to â¼60 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.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2013
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Article