Molecular nanowires inside single-walled carbon nanotubes are produced by capillary filling. Bismuth was
drawn into single-walled carbon nanotubes, where it formed single-crystal nanowires of nanometer dimensions.
Metal was introduced in its gas, solution, and solid phases, with the solution phase process the most efficient
and versatile method of filling. The majority of fillings are one-dimensional nanowires with high length to
diameter ratios. The strong capillary effect in single-walled carbon nanotubes should allow these materials to
host a wide variety of nanoscale materials.
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