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We wish to thank financial support from the JSPS Grants-in-Aid
for Scientific Research No. 19710101, the Shorai Foundation for
Science and Technology, and the ¡®Nanotechnology Network Project¡¯
of the Ministry of Education, Culture, Sports, Science and Technology
(MEXT), Japan.

(a) TEM image of the pristine SWNT material showing the SWNT bundles;
(b) a SWNT nano-fiber is being drawn out of the SWNT suspension by a tungsten
needle; (c) a SWNT nano-fiber laid on top of SiO2 trenches forming five nanobridges;
(d) the same nano-bridge structure after being fixed to the substrate by
deposition of tungsten using FIB.
(a) AFM topographic image of a nano-bridge structure formed by a SWNT
bundle; the inset is an SEM image showing the dimensions of the bundle; (b) force¨C
displacement curves obtained from the three positions indicated by colored arrows
(letters) in (a); (c) simulation model of a SWNT bundle attracted by dielectrophoretic
forces towards the tip of the preformed SWNT nano-fiber; (d) simulated
dielectrophoretic forces and measured packing densities of eight SWNT nano-fibers
plotted with respect to their diameter; (e¨Cg) high-resolution SEM images showing
different surface morphologies of the SWNT nano-fibers with increasing diameters
as indicated in the respective diagrams.

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