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(a) A HRTEM micrograph showing a suspended MWCNT is contacted by a source (top of the figure) and a drain electrode (bottom of the figure). (b) Local magnification of the framed region in (a), showing amorphous coating on the surface of the MWCNT. (c) The same MWCNT as shown in (a), but after electric breakdown at 2.5 V and . (d) Local magnification of the broken segment in (c), showing the formation of a DWCNT. Arrowheads point out a kink between the DWCNT and the MWCNT. (e) The same DWCNT as shown in (d) but being coated with -C by electron-beam radiation. (f) The amorphous carbon in (e) crystallized into disordered graphite after a current-voltage measurement (2.3 V and ). Note that in (e) and (f), the DWCNT remained intact.
Sequential HRTEM images showing the melting and disappearing of an Fe nanowire and an nanoparticle on a nanotube when ramping up the bias voltage. Arrowheads point out the nanoparticle. All of the images are scaled to the same magnification. (a) A pre-existed Fe nanowire encapsulated in a nanotube and an nanoparticle deposited on the nanotube surface. (b) The Fe nanowire was melted and moved upward the nanotube, but the nanoparticle remains intact. (c) The Fe particle disappeared and the nanoparticle was melted. (d) The nanoparticle disappeared.
(a) Conductance vs plots for the amorphous-coated MWCNT [Figs. 1(a) and 1(b)], the MWCNT (not shown in Fig. 1), the DWCNT [Fig. 1(d)], and the amorphous-coated DWCNT [Figs. 1(e)]. Inset to lower-left of (a) is a vs plot of a highly disordered MWCNT. (b) Double-log plot for the curve of the clean DWCNT [Fig. 1(d)].
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