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Precision Milling of Carbon Nanotube Forests Using Low Pressure Scanning Electron Microscopy
Published on: February 5, 2017
Vacancy migrations in carbon nanotubes
Chuanhong Jin1, Kazu Suenaga, Sumio Iijima
1Research Center for Advanced Carbon Materials, National Institute of AdvancedIndustrial Science and Technology, Central 5, Tsukuba 305-8565, Japan. chuanhong-jin@aist.go.jp
Abstract:
Activities of vacancy defects in carbon nanotubes have been directly monitored by in situ high-resolution transmission electron microscopy at elevated temperatures. Adatom-vacancy pair defects are first prolific due to the knock-on damage, and then the induced vacancies indeed grow up to 1-2 nm in the size by the following Joule heating. Surprisingly, these large vacancies, or "holes", tend to migrate and coalesce with each other to form even larger ones. It suggests that the activation barrier has been substantially lowered due to the contributions of an electromigration and/or irradiation effect.

