Vapor-phase synthesis of metallic and intermetallic nanoparticles and nanowires: Magnetic and catalytic properties*
Garry Glaspell, Victor Abdelsayed, Khaled M. Saoud, and M. Samy El-Shall
Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23284-2006, USA
Abstract: In this paper, we present several examples of the vapor-phase synthesis of intermetallic and alloy nanoparticles and nanowires, and investigate their magnetic and catalytic properties. In the first example, we report the vapor-phase synthesis of intermetallic aluminide nanoparticles. Specifically, FeAl and NiAl nanoparticles were synthesized via laser vaporization controlled condensation (LVCC) from their bulk powders. The NiAl nanoparticles were found to be paramagnetic at room temperature, with a blocking temperature of approximately 15 K. The FeAl nanoparticles displayed room-temperature ferromagnetism. In the second example, we report the vapor-phase synthesis of cobalt oxide nanoparticle catalysts for low-temperature CO oxidation. The incorporation of Au and Pd nanoparticles into the cobalt oxide support leads to significantly improved catalytic activity and stability of the binary catalyst systems. Finally, we report the synthesis of nanowires of Ge, Mg, Pd, and Pt using the vapor-liquid-solid (VLS) method where the vapor-phase growth of the wire is catalyzed using a proper metal catalyst present in the liquid phase.
Keywords: nanoparticles; alloys; intermetallic; magnetism; LVCC; catalysis; CO oxidation; vapor-liquid-solid growth; nanowires.
*Paper based on a presentation at the 3rd IUPAC Workshop on New Directions in Chemistry - Workshop on Nanostructured Advanced Materials (WAM III), Stellenbosch, South Africa, 5-9 September 2005. Other presentations are published in this issue, pp. 1619-1801.