Abstract
Ammonium tetrafluoroborate, a cheap and commonly used chemical,was successfully utilized in this study to synthesize BN-coatedMgF2 nanowires and collapsed BN nanotubes, although previous investigations haveindicated that the compound cannot be used as a chemical vapour deposition (CVD)reaction precursor of amorphous or crystalline BN. Our study reveals that whenMgCl2 is used as a promoter a crystalline BN phase can be obtained on a large scale. TheMgCl2 also controls the product morphology, resulting in collapsed BN-coatedMgF2 nanowires at the first stage of CVD. The detailed morphology of the composite nanowires alsodepends on the reaction temperature. Increase in temperature stimulates the nanowire formation. TheMgF2 inclusions can be fully removed via a simple high-temperature evaporation procedure,forming collapsed BN nanotubes of high purity and yield.
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