Selective synthesis of boron nitride nanotubes by self-propagation high-temperature synthesis and annealing process |
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Authors: | Jilin Wang Guowei Zhao Zhanhui Zhang Fang Zhang Weimin Wang |
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Affiliation: | a School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, China b Nano and Ceramic Materials Research Center, Wuhan Institute of Technology, Wuhan 430073, China c The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430073, China |
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Abstract: | Four types of BN nanotubes are selectively synthesized by annealing porous precursor in flowing NH3 and NH3/H2 atmosphere at temperature ranging from 1000 to 1200 °C in a vertical furnace. The as-synthesized BN nanotubes, including cylinder, wave-like, bamboo-like and bubble-chain, are characterized by XRD, FTIR, Raman, SEM, TEM and HRTEM. Three phenomenological growth models are proposed to interpret growth scenario and structure features of the four types of BN nanotubes. Selectivity of nanotubes formation is estimated as approximately 80-95%. The precursor containing B, Mg, Fe and O prepared by self-propagation high-temperature synthesis (SHS) method plays a key role in selective synthesis of the as-synthesized BN nanotubes. Chemical reactions are also discussed. |
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Keywords: | Boron nitrides Nanotubes Chemical vapor deposition Synthesis |
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