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Synthesis of h-AlN Nanowires via Carbothermal Reduction and Nitridation Method Using Acetylene Black

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Using acetylene black as an assistant reagent in the ammonia atmosphere, one dimensional (1D) hexagonal single crystalline aluminum nitride (AlN) nanowires were successfully synthesized via carbothermal reduction and nitridation method. With smooth surface and uniform diameter, the wool-like product of AlN nanowires grow along [001] direction and are 80–120 nm in diameter and several tens micrometers in length. According to thermodynamic and kinetic analysis, Al2O3 initially was reduced to a volatile suboxide gas Al2O at 1800 °C. Then gaseous Al2O was transported by N2/NH3 mixtures to about 1200 °C, where 1D AlN nanowires formed by the reaction of Al2O gas, graphite and NH3. Due to high surface area, small particle size and amorphous structure, acetylene black maybe possess more active sites and more effective contact area, which benefits the first step reaction. The electrostatic polar charge model and crystallographic characteristics are employed to explain the growth mechanism of AlN nanowires. To our knowledge, acetylene black is the first time to be used for synthesizing 1D AlN nanostructures via carbothermal reduction and nitridation method, which would be an efficient, economical assistant reagent for fabricating nitride nanostructures.
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Document Type: Research Article

Publication date: 01 January 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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