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Revealing the anomalous tensile properties of WS2 nanotubes by in situ transmission electron microscopy.
Tang, Dai-Ming; Wei, Xianlong; Wang, Ming-Sheng; Kawamoto, Naoyuki; Bando, Yoshio; Zhi, Chunyi; Mitome, Masanori; Zak, Alla; Tenne, Reshef; Golberg, Dmitri.
Afiliação
  • Tang DM; 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
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 ∼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.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2013 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2013 Tipo de documento: Article