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Lecture Salvatore Iannotta

Roster

WhenWhere
13 July 2009 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Salvatore Iannotta
Affiliation: IFN-CNR Institute for Photonics and Nanotechnology, Trente - FBK Division
Title: Kinetic activated processes at surfaces and hybrid structure synthesis by supersonic and cluster beams
Date: Mon Jul 13, 2009
Start: 16.00
Location: FWN-Building 5114.0004
Host: Petra Rudolf
Telephone: +31 50 363 4736

Abstract

Our approach to the synthesis, interaction and growth of conjugated molecular, cluster assembled and nanohybrid materials combining supersonic free jets which allows a fine control on kinetic energy, state of aggregation, momentum and flux. We study “in situ” the growth process and the interfaces. Our major aim is to understand the role of the initial state of the precursors in the beam on the film formation and to exploit the unique control achievable with supersonic beams on initial kinetic energy, momentum and state of aggregation in the preparation of materials with controlled properties at the different length scales. Results on organic semiconductors show the important role of kinetic energy on structure, morphology and kinetic activated reactive processes . Results on pentacene, metal phthalocyanines, porphyrins and fullerene will be reported. Unprecedented results on activated processes such as the anchoring of molecular florinated groups on SiO2 and the low temperature synthesis of SiC on Si will be presented and discussed.  The growth from supersonic beams can also be extended to metal clusters. We developed and used this approach to prepare thin films of metal oxides that show nano-crystalline characters (anatase-rutile-brookite) depending on the state and size of precursors. This is achieved without any thermal treatments so that the size and morphology of the nanostructures can be better controlled. Gas sensing devices, based on these methods, are being developed and show very promising performances. The synthesis of novel hybrid nanostructures has been developed combined the two different supersonic beams in a co-deposition process, The nanocomposites can be synthesized in a kinetic approach controlling at the same time the inorganic oxide nanostructures and the molecules interacting with them. We applied this concept to the synthesis of CuPc/TiO2 nanostructures and demonstrate the synthesis of such structures by XPS. Preliminary results on gas-sensing devices, based on these nano-hybrid materials, clearly show the ability to produce functional materials with very interesting properties where the organic molecules is stabilized by the inorganic nanostructure while the oxide gets functionalized by the molecules.

Last modified:22 October 2012 2.30 p.m.