Centimeter-scale well-aligned SiC/SiO2 core-shell nanowires were fabricated by a novel interlaminar vapor-diffusion reaction
method in a double-channel quartz tube. The synthesized nanowires grew in a uniform direction perpendicular to a porous graphite substrate
and were parallel to one another. The core-shell nanowires are 10 millimeters long and consist of β-SiC crystalline core of with diameters
of 30-60 nm wrapped with an amorphous silica layer of about 20 nm. The formation mechanism of the well-aligned nanostructure
is probably ascribed to the downward vapor-solid growth process and gravity revulsive effect that plays an important role because of
super high aspect ratio of the as-received nanowires.
Keywords: Array, carbide, core-shell, centimeter-scale, nanowires.
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