Istituto dei materiali per l'elettronica ed il magnetismo     
Iannotta S., Coppedè N., Nardi M., Toccoli T., Verucchi R. Hybrid nanostructures synthesized by supersonic molecular and cluster beams: The perspective of sensing devices exploiting their novel functional properties. In: Hybrid Materials 2009 - First International Conference on Multifunctional, Hybrid and Nanomaterials (Tours (France), 15-19 March 2009). Abstract, Elsevier, 2009.
A variety of approaches are aimed at developing functional nanocomposite hybrids with the basic idea of engineering the interfaces and interactions of the organic and inorganic counterparts at the nanoscale. The great versatility of such materials opens a wide range of applications including optoelectronics, gas sensing, biofunctionality, etc. We introduce a novel approach to the synthesis and growth of nanostructured organic-inorganic hybrids based on the co-deposition from Supersonic Molecular Beams seeded by molecules and clusters (SuMBE). We independently showed that SuMBE gives unprecedented control on reactivity and structure of: a) organic π-conjugated molecules (Pentacene, Porphyrines and to control the growth of hybrid organic-inorganic thin films; b) the synthesis of nanocrystalline films of oxides TiO2 (without any thermal process), c)the ability to activate chemical processes cinematically by tuning the kinetic energy of the precursors in the beam. The newly developed system allows the simultaneous deposition of metal oxides and organic molecules. In this new concept and experimental set up three supersonic beams can be used at the same time, together with a conventional Knudsen cell. The surface and interface electronic properties (UPS, XPS) show the successful ability to synthesize stable hybrid nanostructures such as nanocrystalline TiO2 decorated with organic pi-conjugated molecules (phtalocianines) and organolantanide structures formed by organic macrocycle (porphyrin) and erbium. The nanohybrids are formed by reactions activated by both the kinetic energy of the molecules and the strong reactivity of the inorganic clusters. Their novel functional properties have been demonstrated by gas sensing devices showing an enhanced specific response to, i.e. NOx, of 104 times due to the electron transfer occurring between the inorganic nanostructure and the molecule. The perspective is a new class of nano-hybrids with controlled novel functional properties for applications in sensing and opto-electronic devices.
Subject Pi-Conjugated Molecules
Nanocrystalline Oxides
Thin Film Growth

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