title: Revealing the anomalous tensile properties of WS2 nanotubes by in situ transmission electron microscopy.
abstract: 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 ∼40 nm sustained tensile force of ∼2949 nN and revealed fracture strength of ∼11.8 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 ∼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.
authors: International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan. TANG.Daiming@nims.go.jp
authors: Dai-Ming
authors: DM
authors: Tang
authors: Xianlong
authors: X
authors: Wei
authors: Ming-Sheng
authors: MS
authors: Wang
authors: Naoyuki
authors: N
authors: Kawamoto
authors: Yoshio
authors: Y
authors: Bando
authors: Chunyi
authors: C
authors: Zhi
authors: Masanori
authors: M
authors: Mitome
authors: Alla
authors: A
authors: Zak
authors: Reshef
authors: R
authors: Tenne
authors: Dmitri
authors: D
authors: Golberg