Influence of nitriding gases on the growth of boron nitride nanotubes
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Boron nitride (BN) nanotubes of different sizes and tubular structures exhibit very different mechanical and chemical properties, as well as different applications. BN nanotubes of different sizes and nanostructures have been produced in different nitriding gases in a milling and annealing process, in which elemental boron powder was first milled in NH3 for 150 h and subsequently annealed at 1,200 °C for 6 h. The influence of nitriding gases was investigated by using N2, NH3, N2–H2 mixture gases. A relatively slow nitriding reaction in NH3 gas leaded to a 2D growth of BN (002) basal planes and the formation of thin BN nanotubes without the help of metal catalysts. Fast nitriding reactions occurred in N2 or N2–H2 mixture gases, catalyzed by metal particles, resulted in 3D crystal growth and the formation of many large cylindrical and bamboo tubes.
KeywordsBoron Nitride Boron Powder Boron Nitride Nanotubes Nitriding Reaction Bamboo Structure
Authors would like to thank Dr John Fitzgerald and the staff at the Electron Microscopy Unit for their help in microscopy analysis, and Professor L.T. Chadderton for the fruitful discussion. This work is supported partially by one Discovery research grant awarded by the Australian Research Council
- 2.Chen Y, Williams JS (2005) In: Schultz MJ (ed) Nanoengineering of structural, functional and smart materials, CRC Press LLC, p 167Google Scholar
- 13.Chen Y, Chadderton LT, Williams JS, Fitz Gerald JD (2000) Metastab Mech Alloyed Nanocryst Mater 343–3(Pts 1 and 2):63Google Scholar
- 18.Ma R, Bando Y, Sato T (2002) Japanese society of electron microscopy, p S259Google Scholar