Sonochemically Assisted Thermal Decomposition of Alane N,N-Dimethylethylamine with Titanium (IV) Isopropoxide in the Presence of Oleic Acid to Yield Air-Stable and Size-Selective Aluminum Core−Shell Nanoparticles
journal contributionposted on 15.01.2009, 00:00 by K. A. Shiral Fernando, Marcus J. Smith, Barbara A. Harruff, William K. Lewis, Elena A. Guliants, Christopher E. Bunker
Using sonochemistry to provide the thermal energy and mixing, we demonstrate the ability to synthesize air-stable aluminum nanoparticles of two different size distributions from the titanium-catalyzed thermal decomposition of alane. Characterization data indicate the presence of spherical face-centered-cubic aluminum nanoparticles with average sizes of either 5 or 30 nm that are capped with an organic shell. The average size of the nanoparticles correlates with the concentration of the passivation agent oleic acid, where a higher concentration results in smaller particles. Thermal analysis data demonstrates that at elevated temperatures (>550 °C), these particles react via a typical aluminum oxidation mechanism, whereas at low temperatures (<550 °C), the behavior of these particles is unique and directly related to the presence of the organic shell.