In situ TEM-STM recorded kinetics of boron nitride nanotube failure under current flow.
Joule-heating-induced failure of individual multiwalled boron nitride (BN) nanotubes is investigated in a high-resolution transmission electron microscope (TEM) equipped with a scanning tunneling microscope (STM) unit. Direct observation of the failure process indicates that it occurred via thermal decomposition of tubular layers from inside-out of a tube leaving amorphous ball-like boron-based nanoparticles behind. The electrical transport is well simulated by the thermionic field-emission model. The thermal decomposition temperature, which is deduced from a breakdown curve, shows a dependence on local electrical field; the higher the electrical field, the lower the decomposition temperature. This is attributed to partially ionic nature of a B-N bond.
WPI Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan. XU.Zhi@nims.go.jp
Zhi
Z
Xu
Dmitri
D
Golberg
Yoshio
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Bando