Formation of (BN)xCy and BN Nanotubes Filled with Boron Carbide Nanowires

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• 作者：Weiqiang Han ; Philipp Kohler-Redlich ; Frank Ernst ; and Manfred Rü ; hle
• 刊名：Chemistry of Materials
• 出版年：1999
• 出版时间：December 1999
• 年：1999
• 卷：11
• 期：12
• 页码：Kohler-Redlich, Fran
• 全文大小：178K
• 年卷期：v.11,no.12(December 1999)
• ISSN：1520-5002

文摘

Boron carbide-filled (BN)_xC_y nanotubes with outer layers of pure carbon and inner layersof pure boron nitride (BN) have been synthesized for the first time in high yield by usingpure carbon nanotubes (CNTs) as templates. The (BN)_xC_y nanotubes form by capillary fillingof boron oxide vapor condensed into the inner cavity and a subsequent substitution reactionof the boron oxide with the inner carbon layers of the CNTs in the presence of nitrogen gas.Through a CNT-confined reaction, boron oxide reacts simultaneously with gaseous carbonmonoxide or the carbon layers in the interior of the nanotubes to form a boron carbide filling.The diameters of the filled nanowires typically range from 7 to 20 nm, and the thickness ofBN and C tubular layers is about 5 nm. The length of the filling can be up to the entirelength of the nanotubes. Boron carbide-filled pure BN-NTs also form in the product.