Abstract
We report a new method for the synthesis of boron nitride (BN) nanotubes employing a two-step process in which some oxides have found to catalyze the growth of BN nanotubes. In the first step, a precursor containing B–N–O–Fe/Mg was prepared by ball milling a mixture of B, B2O3, Fe2O3 and MgO (1:7:2:1 mass ratio) in NH3 for 3 h. BN nanotubes (diameter: 20–100 nm) were grown in the second step from this precursor by isothermal annealing at 1,350 °C in NH3 for about 4 h. XRD, SEM and HR-TEM studies elucidated the spindle-like morphology of these nanotubes of hexagonal crystal structure. The Raman spectrum showed the peak broadening and shifts to higher frequency. The present method showed that some oxides assisted the growth of BN nanotubes. A possible reaction mechanism on the formation of BN nanotubes in the presence of these oxides is discussed.
Published Version
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