Iron boride nanowires are synthesized here by reaction of Fe-filled carbon nanotubes with boron oxide vapor. The thus formed FexB nanowires are encapsulated within the nanotubes (see Figure) and their diameter is approximately that of the starting material, demonstrating that the reaction is confined within the nanotubes. Hence nanotubes can be used as nanoreactors for changing the existing filling from one kind of material to another.
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Han et al. (2000) studied this question.