Selective Growth of Boron Nitride Nanotubes by the Plasma-Assisted and Iron-Catalytic CVD Methods

[[abstract]]Boron nitride nanotubes (BNNTs) were selectively synthesized on patterned bilayer (Fe/Al) catalysts by the plasma-assisted chemical vapor deposition (PACVD) method. The as-grown nanotubes comprise both coaxial and cup-stacking tubular structures. Optical transitions oil cup-stacking BNNTs are investigated for the first time. The observed red-shift of free excitonic luminescence was attributed to the excitonic recombination in terms of defect trapping ill the tube's surface. The O-2 additives during the synthetic process were found to balance the excess H radicals that ill turn enhance the growth yield of BNNTs. Moreover. Our elemental mapping results provide direct evidence of the metal catalytic mechanism and the influence of the as-formed Al2O3 underlayer.[[fileno]]2060126010039[[department]]工程與系統科學