Large-Scale Synthesis of Boron Nitride Nanotubes with Iron-Supported Catalysts

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• 作者：Ching-Yuan Su ; Wen-Yi Chu ; Zhen-Yu Juang ; Ko-Feng Chen ; Bing-Ming Cheng ; Fu-Rong Chen ; Keh-Chyang Leou ; Chuen-Horng Tsai
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：August 20, 2009
• 年：2009
• 卷：113
• 期：33
• 页码：14732-14738
• 全文大小：299K
• 年卷期：v.113,no.33(August 20, 2009)
• ISSN：1932-7455

文摘

Boron nitride nanotubes (BNNTs) were synthesized in a large scale with iron-supported catalysts (Fe/SiO₂−Al₂O₃) at low temperatures (900 °C) in a plasma-assisted chemical vapor deposition system. The structural morphology, chemical composition, and optical and photoluminescence properties of BNNTs were characterized. The obtained BNNTs are crystalline and with tubular structures, and the preferential zigzag arrangement of BNNTs was discovered for the first time for BNNT grown at low temperature (<1000 °C). The O₂ additives were found to affect the growth yield significantly and it was attributed to the enhanced dehydrogenation from the catalyst surface and improved balancing of excess H radicals during our synthetic process. In addition, results from elemental-mapping revealed that the boron dissolved in iron tends to precipitate and react with nitrogen to form a BN sheet on the catalyst surface.