Preparation of h-BN nano-tubes, -bamboos, and -fibers from borazine oligomer with alumina porous template

h-BN nano-tubes, -bamboos, and -fibers were prepared separately from borazine oligomers using an alumina porous template at different wetting times of 20 h, 40 h and 2 weeks at room temperature, respectively. The borazine oligomer in the template was transformed to the h-BN nano-materials by two-step heat-treatment at 600 and 1200 °C in flowing N2. The FT-IR result confirmed the formation of BN. TEM and SEM images showed the formation of the nano-tubes in diameters 200–300 nm with thin walls about 10–20 nm thick, nano-bamboos 200–300 nm wide with knots at the separations of 0.5–1 μm, and the nano-fibers 15–20 μm long with fine crystallized BN particles. The mechanism for the formation of h-BN nano-tubes, -bamboos and -fibers is proposed.