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Lecture Salvatore Iannotta


03 March 2004 FWN-Building 5113.0201, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Salvatore Iannotta
Affiliation: Institute for photonics and nanotechnology CNR - Trento division, Italy
Title: Growth of organic, cluster-assembled and hybrid materials from supersonic molecular beams (SUMBE) and applications
Date: Wed Mar 3, 2004
Start: 11.00
Location: FWN-Building 5113.0201
Host: Petra Rudolf
Telephone: +31 50 363 4736


The novel approach to the growth of ordered films of π-conjugated systems based on supersonic free jets (SUMBE) will be introduced and discussed. It allows an unprecedented control on the final properties of the organic films by a fine 'tuning' the kinetic energy, state of aggregation, momentum and flux of the precursors. We study 'in situ', in a UHV deposition apparatus including surface characterization methods (UPS, XPS, LEED, Auger), the growth process and the interfaces. Our major aim is understanding the role of the initial state of the molecule on the film formation. Optical characterizations, AFM and X-ray diffraction are also carried out 'ex-situ'. Results show the role of kinetic energy on structure and morphology of films: it appears to be a critical factor for growing high quality crystalline films. We also develop prototype devices to correlate growth process to structure, morphology and functional properties. Major results obtained on oligothiophenes, pentacene and phthalocyanines will be discussed. The growth from supersonic beams can also be extended to metal based nanostructures using clusters as precursors. We have developed and used this approach to prepare thin films of metal oxides that show different nano-crystalline character (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 compared to more standard methods. Gas sensing devices, based on these methods, are being developed and show very promising performances.
Last modified:22 October 2012 2.30 p.m.