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Architecture and Surface Chemistry of Compound Nanoclusters

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Technical Report,01 Jan 2009,31 Dec 2011

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University of Georgia Research Foundation, Inc. Athens United States

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Fundamental studies are conducted on metal atom and oxide nanoparticles to develop new synthetic strategies, to elucidate electronic structure and bonding principles, and to evaluate these materials for applications relevant to the Air Force. Transition metal and main group metal oxide clusters are produced in the gas phase with laser vaporization of solid targets. Molecular beam and mass spectrometry studies on size-selected ions include laser photodissociation measurements to reveal stability patterns and infrared spectroscopy to determine structures and reveal ligandadsorbate interactions. CO and CO2 ligands are the focus of this latter work. In other related work, clusters produced initially in the gas phase are ligand-coated and isolated in solution. This new synthetic process allows ultra-small metal particles to be produced for the first time. Vanadium oxide, chromium oxide and cobalt oxide systems in the 5-25 atom size range coated with THF or acetonitrile ligands have been isolated and characterized.

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