Identification of active atomic defects in a monolayered tungsten disulphide nanoribbon

Zheng Liu, Kazu Suenaga (), Zhiyong Wang (), Zujin Shi, Eiji Okunishi and Sumio Iijima
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Zheng Liu: Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST)
Kazu Suenaga: Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST)
Zhiyong Wang: Beijing National Laboratory for Molecular Sciences, State Key Lab of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University
Zujin Shi: Beijing National Laboratory for Molecular Sciences, State Key Lab of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University
Eiji Okunishi: JEOL Ltd
Sumio Iijima: Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST)

Nature Communications, 2011, vol. 2, issue 1, 1-5

Abstract: Abstract Edge structures and atomic defects can significantly affect the physical and chemical properties of low-dimensional materials, such as nanoribbons, and therefore merit a thorough investigation at the atomic scale. Here, we successfully discriminate single atoms on a monolayered tungsten disulphide nanoribbon by means of time-resolved annular dark-field imaging and spatially resolved electron energy-loss spectroscopy. We unambiguously identify and successfully visualize in motion atomic defects, such as vacancies and edge atoms, using scanning transmission electron microscopy. We also report a direct observation of slip deformation in the nanoribbons and present evidence demonstrating that the deformation process involves the migration of vacancies and rearrangement of tungsten atoms. Single-atom defects are successfully observed for the first time during plastic deformation.

Date: 2011
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DOI: 10.1038/ncomms1224

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