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Organic, Cluster Assembled and Nano-Hybrid Materials Produced by Supersonic Beams: Growth and Applications to Prototype Device Development

S. Iannotta, L. Aversa, A. Boschetti, S. Chiarani, N. Coppedè, M. Nardi, A. Pallaoro, F. Siviero, T. Toccoli and R. Verucchi
Institute for Photonics and Nanotechnology - Trento Division, IT

Keywords:
organic, cluster assembled nanooxides, nanocomposites, supersonic beams

Abstract:
Organic materials (oligothiophenes, pentacene and phthalocyanines), cluster assembled nano-oxides and nanohybrid materials are produced by supersonic free jets in UHV (characterized by surface methods UPS, XPS, LEED, Auger). We demonstrate the role of precursors initial state (kinetic energy, momentum and state of aggregation) on film formation and hence we exploit it in the preparation of materials with controlled properties at different length scales. FET devices demonstrate the control on final properties of devices. By supersonic beams, extended to metal clusters, we grow metal oxides films showing different nano-crystalline character (anatase-rutile-brookite) depending on state and size of precursors, hence producing well controlled nanostructures. The gas sensing devices developed show state of the art performances . Synthesis of novel hybrid nanostructures has been developed combining the two different supersonic beams in a co-deposition scheme. Nanocomposites can then be synthesized in a kinetic approach controlling simultaneously the inorganic oxide nanostructures and the molecules interacting with it during growth. This concept has been applied to the synthesis of CuPc/TiO2 producing nano-hybrid structures. Gas-sensing devices, based on these nano-composites materials, demonstrate that their very interesting properties: the organic molecule is stabilized by the inorganic nanostructure while the oxide gets functionalized by the molecules.

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