book of abstracts - IM2NP

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P R O G R A M WEDNESDAY, JUNE 30 N A N O S E A 2 0 1 0 Session 11 Room Port-Pin Zn-Based-Nanostructures (Chairman: Grosso) 10H50-11H20 KUZNETSOV (Dept of Physics, University of Olso, P.O.Box 1048 Blindern, NO-0316 Oslo, Norway) Band gap engineering in ZnCdO nanostructures: synthesis, properties and applications 11H20-11H40 FARHADYAR (1) Department of Chemistry, Faculty of Basic Sciences,varamin –pishva Branch , Islamic Azad University,Iran, 2)Department of Chemistry, Faculty of Basic Sciences, Sciences and Research Campus, Islamic Azad University, Tehran Iran) Preparation of nanosize ZnO on the hollow silica matrix and study of it‟s photocalytic activity 11H40-12H00 SALIBA (a University of Toulouse, UPS, Bat 2R1, 118 route de Narbonne, 31062 Toulouse ; b Laboratoire de Chimie de Coordination; CNRS UPR 8241, 205 route de Narbonne, 31077 Toulouse) Liquid Crystalline-ZnO Nanoparticle Hybrids 12H00-12H20 GIRI (Department of Physics, Indian Institute of Technology Guwahati -781 039, India) Cobalt doping of ZnO nanoparticles by ball milling: Enhanced UV luminescence and room temperature ferromagnetism 12H20-12H40 GOUDARZI (aDept.of Polymer Engineering, Golestan University,Gorgan,Iran.,bDept.of Chemistry, University of Ilam, Ilam, cPolymer Science and Engineering Pusan National University, Busan 609-735,Republic of Korea) Study of Composition, Structure and Optical Properties of Nano-structured ZnS:Mn Thin Films Prepared by Chemical Deposition Method 61
A B S T R A C T S WEDNESDAY, JUNE 30 N A N O S E A 2 0 1 0 Room Calendal 8H30-9h00 Molecular diffusion processes in nanostructured organic thin films. C. Teicherta, G. Hlawaceka, S. Lorbeka, P. Puschnigb, C. Ambrosch-Draxlb, P. Frankc, T. Potocarc,A. Winklerc (a Institute of Physics, University of Leoben, A-8700 Leoben, Austria; b Chair of Atomistic Modelling and Design of Materials, University of Leoben, A-8700 Leoben, Austria; c Institute of Solid State Physics, Graz University of Technology, A-8010 Graz, Austria)teichert@unileoben.ac.at 1 – Introduction Crystalline films of conjugated organic semiconductors offer attractive potential for optoelectronic and electronic applications on flexible substrates. Due to the complexity and anisotropy of the molecular building blocks, novel growth mechanisms can occur as is demonstrated for the growth of the rod-like oligophenylene molecule parasexiphenyl (6P) on mica surfaces. On clean mica(001), the self-organization of crystallites into one-dimensional chains is observed on a wetting layer where the 6P molecules lie on the surface [1]. 2 – Abstract Here we demonstrate by atomic force microscopy that on an ion bombarded mica surface, the formation of terraced mounds composed by almost upright standing molecules is observed. Quantitative analysis of the morphology together with transition state theory calculations revealed the existence of level dependent step edge barriers and molecule bending during step edge crossing [2]. A lower barrier due to less molecular tilt in the first layer results in the completion of one monolayer before mound formation starts. By temperature and rate dependent growth experiments we also determined the size of the critical nucleus to be significantly larger than one. 3 – Conclusion Our analysis showed that procedures developed and verified for inorganic systems [3] can be successfully applied to organic thin film growth. However, we have also demonstrated that the complexity and anisotropy of the molecular building blocks lead to additional effects that are not observed in atomic inorganic growth systems. [1] C. Teichert G. Hlawacek, A. Andreev, H. Sitter, P. Frank, A. Winkler, N.S. Sariciftci, Appl. Phys. A 82 (2006) 665. [2] G. Hlawacek, P. Puschnig, P. Frank, A. Winkler, C. Ambrosch-Draxl, C. Teichert, Science 321 (2008) 108. [3] T. Michely and J. Krug; Islands, Mounds and Atoms (Springer, Berlin 2004). 62
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