| Titre : | Efficient synthesis route to quasi - aligned and high - aspect - ratio aluminum nitride micro - and nanostructures (2012) |
| Auteurs : | Tae-Hyuk Lee, Auteur ; Hayk H. Nersisyan, Auteur ; Ha-Guk Jeong, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Chemical engineering journal (Vol. 174 N° 1, Octobre 2011) |
| Article en page(s) : | pp.461–466 |
| Note générale : | Génie chimique |
| Langues : | Anglais |
| Tags : | Aluminum nitride Combustion synthesis Ceramic–metal systems Composites ransmission electron microscopy |
| Résumé : | Quasi-aligned, high-aspect-ratio AlN micro- and nanostructures were synthesized under high nitrogen pressure by the exothermic reaction of an Al + 0.015 mol (C2F4)n mixture. Structurally uniform AlN micro- and nanofibers with hexagonal and cylindrical morphologies were obtained when the system temperature was maintained within the range of 1600–1700 °C. The fibers had aspect ratios as high as 2000, diameters in the range of ∼0.05–20 μm, and were ∼100–1000 μm in length. High-resolution transmission electron microscopic and selected area diffraction analyses indicated that the as-synthesized AlN micro- and nanostructures are perfectly single crystalline with preferential growth along the [0 0 1] direction. Branching was also observed in some of the micro-fibers, giving rise to randomized, two-dimensional comb textures. Based on the results obtained in the present study, a mechanism for the formation of AlN micro- and nanostructures under combustion conditions was proposed. |
| ISSN : | 1385-8947 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S1385894711011053 |
