New iron oxide and iron-manganese oxide shaped nanoparticles: Synthesis, characterization, growth studies, oxidation, and derivatization

INOR 60

Kenton H. Whitmire, whitmir@rice.edu1, Cristina Hofmann, chofmann@rice.edu1, Irene Rusakova2, Carly S Levin1, Teyeb Ould-Ely, mohamedTeyib.OuldEly@RoswellPark.org1, Dario Prieto-Centurion1, Keith Hartman, hartman@rice.edu1, Anna Kelly, akelly@rice.edu1, Andreas Luttge, aluttge@rice.edu3, and Naomi J Halas, halas@rice.edu4. (1) Department of Chemistry, Rice University, MS60 6100 Main Street, Houston, TX 77005, (2) Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002, (3) Department of Earth Science, Rice University, 6100 Main Street, Houston, TX 77005, (4) Department of Chemistry, and Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005
New nanoparticles (NPs) shapes of iron oxide iron-manganese oxide and fragments thereof, were synthesized in an amine/carboxylic acid mixture from the metal carboxylate precursors at elevated temperatures. Electron microscopy and X-ray diffraction experiments show that the homometallic iron oxide (FeOX) NPs are single crystal face-centered cubic FexO (wüstite) with small amounts of Fe3O4 (magnetite), while the mixed-metal NPs are single crystals of solid solutions of Fe1-yMnyO. Oxidation of the NPs occurs with shape retention, which is significant for their incorporation in advanced ceramic and magnetic materials. NPs were produced with different shapes depending on the reaction conditions. Iron oxide nanocubes with concave faces could be produced exclusively by tuning the reaction conditions. The NPs were successfully derivatized as iron oxide-gold nanoshells (FeOX@Auº). We will discuss the synthesis, characterization, growth mechanism, reaction parameters effects on the nanocrystal's shape, oxidation, derivatization, magnetism and optical properties of these nanostructures.
 

Nanoscience - Characterization and Applications
9:00 AM-1:00 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 221, Oral

Division of Inorganic Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008