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JUNE 28 WEDNESDAY AFTERNOON RIVA.TF-WEA-P.3 ON THE PHYSICAL PROPERTIES OF PENTACENE THIN FILMS. Mihaela Girtan a,b Sylvie Dabos – Seignon a , J.M. Nunzi a . a Laboratoire POMA, UMR CNRS 6136, Université d’Angers, 2 Bd. Lavoisier, 49045 Angers cedex, France, email: mihaela.girtan@univangers.frb Faculty of Physics, Al.I. Cuza University of Iasi, Romania Pentacene thin films with thickness ranged between 50 nm and 200 nm were deposited by vacuum thermal evaporation on glass and ITO substrates at room temperature. The rate of deposition was about 0.14 nm/s. The influence of substrate nature and films thickness on the film morphology was investigate by atomic force microscopy (AFM). Electrical and optical investigations were correlated with the structural and morphological analyses. 118
JUNE 28 WEDNESDAY AFTERNOON RIVA-TF-WeA-P.2 PHOTOCATALYTIC DEGRADATION OF COMMERCIAL DYES USED IN THE TEXTILE INDUSTRY BY THE DEPOSITION TiO 2 THIN FILMS ON GLASS SUBSTRATES. S.M. Marques 1 , C.J. Tavares 1 , V. Teixeira 1 , J.O. Carneiro 1 , A.J. Fernandes 2 . 1 Departamento de Física, Universidade do Minho, 4800-058 Guimarães, Portugal. 2 Departamento de Física, Universidade de Aveiro, 3810-193 Aveiro, Portugal ctavares@fisica.uminho.pt The interest in nanoparticle photocatalytic titania (TiO 2 ) thin films has been increasing over the last few years, due to the self-cleaning nature of these coatings. They have been used on industrial applications, mainly due their ability to degrade pollutants dissolved in water. Titania acts as a photocatylist for the dissociation of organic impurities on a particular surface, such as glass. The driving force behind this photocatalisation is simply ultraviolet (UV) light and atmospheric oxygen. The thin films of titania were deposited by unbalanced reactive magnetron sputtering, from a high purity Ti target in an Ar/O 2 atmosphere, with an argon flow rate of 60 sccm (working gas) and a variable oxygen flow rate in he range of 1.5-9 sccm (reactive gas). Due to the fact that the deposition temperature is rather low (≈ 200ºC), the titanium dioxide particles that nucleate on the substrate do not have sufficient energy and mobility to crystallise in a regular lattice, such as Brookite, Anatase or Rutile. In order to achieve this thermodynamical equilibrium and enhance the composition between the crystallographic phases, after deposition the samples were thermally annealed in a high vacuum furnace at different temperatures, 300ºC, 400ºC and 500ºC for 2 hours. In order to comprehend the underlying structure, X-ray diffraction measurements were then preformed in these heat treated samples and the composition of the films was study by Rutherford Backscattering spectroscopy (RBS). We also estimated the thickness of the films made with different flow rates of oxygen and with different times of deposition, using the Swanepoel’s method for the calculation of the optical properties of the coatings. The photocatalytic behaviour of the titania coatings was assessed by combined ultra-violet irradiation and absorption measurements of particular dyes. The observed photo-decomposition of the aqueous solution (organic pollutants) was measured in the UV/Vis Spectrum by the decrease of the maximum absorbance with irradiation time. The colour of the dye becomes colourless during this process, hence indicating that the chemical oxidation-reduction mechanisms abound on the surface of the titania films. As pollutants, we used dyes that are currently used in the textile industry, as it is the case of the reactive dye “RED 41”. 1<strong>17</strong>
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Sigilum Universitatis Studii Salama
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