Field of Expertise: Advanced Material Science

Thursday 24 October 2013      HS II, Alte Technik

Opening, Welcome
 

Focused electron beam induced deposition of functional nanostructures: from fundamentals to applications
Robert Winkler

Focused electron beam induced deposition (FEBID) is a direct-write technique for the fabrication of functional 3D structures with spatial nanometer resolution even on non-flat surfaces. FEBID uses gaseous precursors which are brought into the vacuum chamber via a localized gas in ... more

Organosilylgermane compounds as precursor for solution-liquid-solid synthesis of germanium nanowires
Mohammad Aghazadeh Meshgi, Peter Poelt, Christoph Marschner

Synthesis of germanium nanowires with organosilylgermane compounds as precursor is a known process, but the synthesis via vapor-liquid-solid method requires temperatures above 300 oC.1,2 However, solution-liquid-solid (SLS) synthesis of germanium nanowires with bismuth catalyst a ... more

Zincate Electrolyte Optimization for the Zinc-Air Redox Flow Battery
Christian Zelger, Bernhard Gollas, Aleksandra Gavrilovic-Wohlmuther, Andreas Laskos, Institut für Chemische Technologie von Materialien

Intermittent and difficult-to-predict energy sources, like wind farms and solar plants, have to be transformed into a more predictable power source for the customers. This could be obtained with an energy buffer, like a battery [1]. Due to the low cost, environment-friendliness a ... more

SQUID magnetometry combined with in-situ cyclic voltammetry: A new approach for studying the correlation between electrochemical processes and magnetic properties
Stefan Topolovec, Heinz Krenn, Stefan Landgraf, Roland Würschum, Institut für Materialphysik

The combination of magnetism and electrochemistry has attracted considerable attention in the last years. By designing a three-electrode electrochemical cell for operation in a commercial state-of-the-art SQUID magnetometer we have developed a new approach for studying the correl ... more

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Prediction of hot tearing on industrial steel casting using a viscoplastic model coupled with damage
Semin Hadzic, Institute for Material Science and Welding

Hot tears are one of the most unacceptable defects in steel casting that can be found in final a product. A hot tear is a fracture formed in the mushy zone with a high fraction of solid due to applied tensile strain. The solidification grade, the deformation and the porosity are ... more

Friction Stir Welding of Aluminium-SiC MMC boxes for astronautics
J. Pakkanen, A. Hütter, N.Enzinger, C. Sommitsch, Institut für Werkstoffkunde und Schweißtechnik

For astronautic applications, light-weight boxes to protect and carry electronic equipment need to be sealed. The main requirements on the components are low thermal expansion, gas tightness and corrosion resistance. The common material for such a application is a metal matrix co ... more

Serienschnitttechnik von fluoreszierenden Papierproben
Karin Hofer, Harald Schäffner, Wolfgang Bauer, Institut für Papier-, Zellstoff- und Fasertechnik

Serienschnitttechnik kombiniert mit Lichtmikroskopie ermöglicht eine dreidimensionale Analyse von Papierstrukturen. Diese Methode findet in der Bestimmung von Strichschichtverteilungen, sowie auch bei der Vermessung von Einzelfaserquerschnitten Anwendung. Ein erster Prototyp wur ... more

Dipyridyl(pyridazine)-decorated macroporous poly(dicyclopentadiene) (pDCPD) foams prepared by inverse electron demand Diels-Alder (iEDDA) chemistry
Astrid-Caroline Knall,* David Reishofer, Sebastijan Kovačič, Christian Slugovc, Institute for Chemistry and Technology of Materials

Curing of the difunctional monomer dicyclopentadiene (DCPD) via Ring-Opening Metathesis Polymerisation (ROMP) leads to poly-(dicyclopentadiene) (pDCPD), a thermoset material with favourable mechanical properties. By performing this polymerisation in a stabilised High Internal Pha ... more

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Preparation and Electron Microscopy of Graphene
Daniel Knez, Center for Electron Microscopy

Graphene, a single atom layer of graphite, is the first representative of a completely new class of materials, which are considered to be a future key technology due to their unusual physical properties. It is very promising for a wide field of applications. For instance the usag ... more

Measurement of surface tension by means of electromagnetic levitation
Kirmanj AZIZ

Electromagnetic levitation provides an elegant method for noncontact containerless measurement of metallic melts. Such a device has been recently constructed by the thermophysics and metalphysics group at TU Graz, Austria and first investigations of copper in the liquid phase hav ... more

Combining Small Angle X-ray Scattering and Deep X-Ray Lithography for material science
Benedetta Marmiroli

Micro-nanotechnology has dissolved the borders among material science, chemistry and biology. The miniaturization of chemical and biological assays requires both a careful selection of the fabrication methods and the development of tailored materials for specific applications. As ... more

Correlated quantum systems out of equilibrium: Methods, Applications, Challenges
Martin Nuss

The theoretical understanding of the non-equilibrium behavior of strongly correlated quantum many-body systems is a long standing challenge, which has become increasingly relevant with the progress made in the fields of molecular-and nano- electronics, spintronics, spectroscopy o ... more

Studying Metal-Organic Interfaces with Density-Functional Theory
David A. Egger, Georg Heimel, Egbert Zojer, Institute of Solid State Physics

Understanding the phenomena occurring at interfaces between different materials is of fundamental importance in science and technology. In this presentation, I will focus on interfaces between metals and organic semiconductors, where our group aims to establish a fully microscopi ... more

Superconductivity, a computational Approach
Lilia Boeri

Superconductivity is one of the oldest and most fascinating problems in solid state physics. In the last ten years, the advancement of numerical ab-initio techniques has permitted to gain a deep insight into the material-dependent properties which characterise real superconductor ... more

Posters Thursday 24 October 2013      Foyer Alte Technik

Impact of the interplay of van der Waals interactions, surface reconstructions and coverage on electronic and structural properties of self-assembled monolayers
Elisabeth Verwüster, Institute of Solid State Physics

The deposition of self-assembled monolayers (SAMs) is an efficient way of tuning the properties of interfaces. SAMs can be adsorbed on or covalently bound to an underlying metallic substrate. Even if such systems are stabilized by being covalently linked, van der Waals interacti ... more

Conducting Cellulose Fiber Networks as Flexible Substrate for Optoelectronic Applications
Heribert Kopeinik, Institute of Solid State Physics

Electronics based on natural materials is becoming increasingly attractive. Paper, an omnipresent composite of pressed cellulose fibers, has been considered for flexible substrate in thin film electronics in the past. However, successful realizations for according diodes were so ... more

The antiferroelectric Lanthanum-modified Lead Zirconate Titanate: A material for power devices
Theresa Kainz

Antiferroelectric ceramics have gained considerable interest as materials for charge storage devices and are key components for hybrid transmission technologies. This resulted in a revival of Lanthanum-modified Lead Zirconate Titanate. The solid solution of Lead-Zirconate and Lea ... more

INVESTIGATION OF HIERARCHICAL MESOSTRUCTURED SILICA SYNTHESIZED IN THE GAS PHASE
Barbara Sartori

The spray-drying of aerosol droplets is an economically attractive method to obtain mesostructured nanoparticles. Undestanding the self assembly process during the precursors condensation is the key to control the size and the architecture of the nanoparticles, which can be subse ... more

Enzymatic Cellulose Hydrolysis: New Approaches in the Investigation of Biocatalytic Processes via In-situ Liquid Atomic Force Microscopy
Thomas Ganner

Cellulose, a biopolymer consisting of linked sugar molecules as polymer-units, is used by plants as a structural compound in their cell walls. It is the most abundant polymer of this kind on earth and by degrading it to sugar and then into ethanol it is a valuable resource of ene ... more

Chemical degradation and morphological instabilities during focused ion beam prototyping of polymers: a problem and a solution
Angelina Orthacker, Center for Electron Microscopy

During the last decade focused ion beam (FIB) processing has become a unique tool for the site specific fabrication of ultrathin lamellas suitable for transmission electron microscopy. Due to its versatile functionalities, this method has also attracted increasing attention as a ... more

High-resolution laser dilatometry applied to volume equilibration phenomena in a Zr-based bulk metallic glass
Martin Luckabauer

Most models describing the glass transition are based on experimental or simulation data that were obtained from the supercooled liquid state, i.e., at temperatures above the glass transition. The slowing down of molecular or atomic motion occurring at the glass transition temper ... more

Temperature evolution in soft matter materials during focused ion beam prototyping: from fundamentals towards optimization
Roland Schmied, Center for Electron Microscopy

During the last decade focused ion beam (FIB) processing became of increased importance due to its unique possibilities of site specific specimen manipulation. So far, FIB processing has been well established for transmission electron microscopy related ultrathin lamella preparat ... more

Using orbital tuning in self-assembled monolayers to build molecular quantum-well structures
Bernhard Kretz, Institute of Solid State Physics

The possibility of controlling interface properties “at will” holds a high promise for hybrid electronics applications. Covalently-bonded self-assembled monolayers (SAMs) are very well suited for such interface modifications, as they offer a high flexibility regarding the des ... more

Charge transport through molecular monolayers: Influence of collective effects and docking groups
Veronika Obersteiner, David A. Egger, Georg Heimel, Egbert Zojer, Institute of Solid State Physics

In the context of transport through molecular-based systems, it has been increasingly acknowledged over the past years that there are fundamental differences between individual molecules and continuously-extended, two-dimensional monolayers [1] [2]. Here, we aim at relating those ... more

Dynamics of SiC-nc:Polymer Blend Formation for Hybrid PVs
Olivia Kettner, Institute of Solid State Physics

Hybrid solar cells, whose photoactive layer comprises a mixed structure of an organic electron donor and an inorganic electron acceptor, have become of considerable interest as a low cost option for solar energy harvesting. According devices offer the benefits of solution process ... more

Investigating the influence of van der Waals interactions on the adsorption of flat-lying molecules on metallic surfaces
Elisabeth Wruss(1), David A. Egger(1), Yuli Huang(2), W. A. Saidi(3), Tomáš Bučko(4,5), Satoshi Kera(2) and Egbert Zojer(1), (1) Institute of Solid State Physics, Graz University of Technology; (2) Graduate School of Advanced Integration Science, Chiba University; (3) Department of Ch

Van der Waals (vdW) interactions crucially impact the adsorption of organic molecules on metal surfaces. Their contribution to the overall binding mechanism becomes especially significant in case of flat-lying organic molecules, which are often referred to as being only weakly bo ... more

Investigation of Electronic Properties of Self-Assembled Monolayers with Embedded Dipoles
Iris Hehn, Manuel Vieider, Otello Maria Roscioni, Luca Muccioli, Martin Stolterfoht, Michael Zharnikov, Claudio Zannoni, Egbert Zojer, Institute of Solid State Physics

An efficient way of tuning the properties of interfaces is the inclusion of self-assembled monolayers. By using mid-chain ester functionalized alkanethiols, as studied in this work, one can efficiently shift the work function of substrate materials. This allows improving charge i ... more

Effective electronic model of a quasi-one dimensional compound: Li_0.9Mo₆O₁₇
Martin Nuss, Institute of Theoretical and Computational Physics

We investigate the electronic structure of the strongly anisotropic, quasi low dimensional purple bronze Li0.9Mo6O17. Building on all-electron ab-initio band structure calculations we obtain an effective model in terms of four maximally localized Wannier orbitals, which turn out ... more

In-situ thin film transistor fabrication: Electrical and surface analytical characterization
R. Lassnig, B. Striedinger, A. Fian, B. Stadlober and A. Winkler, Institute of Solid State Physics

The underlying principles affecting performance and lifetime of organic semiconducting devices are still not fully understood. We present analysis on the formation and stability of Pentacene layers in organic field effect transistors (OFET) through a unique combination of organic ... more

Initial steps of rubicene film growth on silicon dioxide
Boris Scherwitzl, Institute of Solid State Physics

Studies of the initial stages of organic film growth are of great relevance for the use of organic materials in microelectronic devices, which became of increasing importance in a variety of applications. This contribution describes the behavior of rubicene (C₂₆H_{1 ... more}

Processing of lead-based antiferroelectric Ceramics
Mirjam Skof, Theresa Kainz, Klaus Reichmann, Institut für Chemische Technologie von Materialien, TU Graz

For lead-based ceramics, the sinterability and densification of the samples strongly depends on the sinter temperatures used. With PbO as the volatile compound the experimental set-up as well as the maintaining of the atmosphere during sintering is crucial. An aggressive depletio ... more

Characterization of the production process of nanoimprinted organic devices by analytical TEM
Johanna Kraxner, Graz Centre for Electron Microscopy and Institute for Electron Microscopy and Nanoanalysis

Organic electronics is a field of research with growing interest in the last years. Many applications are already entering industrial commercialization, but the search for new materials and the improvement of the used processes is still in progress. My work is so far embedded in ... more

High performance chemical sensors based on luminescence
Daniel Aigner, Ingo Klimant, Sensor Materials Workgroup, Institute of Analytical Chemistry and Food Chemistry

Luminescence sensors allow on-line monitoring of chemical species, biological components or physical parameters. In a sample, their luminescence properties show a measureable change in emission light intensity, emission wavelength (colour) or luminescence decay time. That allows ... more

The Heat of Sorption in Paper Drying
Patrick Leuk, Michael Schneeberger, Ulrich Hirn, Wolfgang Bauer, Institut für Papier-, Zellstoff und Fasertechnik

When the dry content during pulp drying reaches a level above 75% to 80% the free water, i.e. unbound water, has been evaporated. The remaining water is bonded to the surface due to physisorption, additional energy is necessary to overcome these bonding effects. This additional e ... more

Bright blue solution processed triple-layer polymer light emitting diodes realized by thermal layer stabilization and orthogonal solvents
Roman Trattnig, Leonid Pevzner, Monika Jäger, Manuel Auer, Raphael Schlesinger, Marco Vittorio Nardi, Giovanni Ligorio, Christos Christodoulou, Norbert Koch, Ma, NanoTecCenter Weiz / Institut für Festkörperphysik

The realization of fully solution processed multilayer polymer light emitting diodes (PLED) constitutes the pivotal point to push PLED technology to its full potential. In this contribution we present a fully solution processed triple layer PLED realized by a combination of two d ... more

Alexander Blümel1,2, Harald Plank3, Evelin Fisslthaler3, Meltem Sezen3, Werner Grogger3, Emil J.W. List-Kratochvil1,2, 1NanoTecCenter Weiz Forschungsgesellschaft mbH, 2Institute for Solid State Physics, Graz University of Technology, 3Institute for Electron Microscopy, Graz Univ

Kelvin Probe Force Microscopy (KPFM) is an Atomic Force Microscopy (AFM)-based technique and it is used in many fields of application for its capability to reveal the lateral variations of the surface potential on a flat sample. However, proper interpretation of the real data is ... more

Influence of the Bridging Atom in Fluorene Analogue Low-Bandgap Polymers on Photophysical and Morphological Properties of Copper Indium Sulfide/Polymer Nanocomposite Solar Cells
Monika Jäger, Roman Trattnig, Markus Postl, Wernfried Haas, Birgit Kunert, Roland Resel, Ferdinand Hofer, Andreas Klug, Gregor Trimmel, Emil J.W. List, NanoTecCenter Weiz Forschungsgesellschaft mbH, Franz-Pichler-Straße 32, 8160 Weiz Institute of Solid State Physics, Graz University of Technology, Petersgasse 1

This contribution presents the correlation between structural, morphological, and fluorescence properties as well as device performance of nanocomposite solar cells comprising two low-band gap polymers, poly[[9-(1-octylnonyl)29H-carbazole- 2,7-diyl]-2,5-thiophenediyl-2,1,3-benzot ... more

Johannes Kofler(1), Florian Kolb(1), Andreas Klug(1), Emil J.W. List Kratochvil(1,2), 1NanoTecCenter Weiz Forschungsgesellschaft mbH, Franz-Pichler Straße 32, A-8160 Weiz, Austria 2Institute of Solid State Physics, Graz University of Technology,

The authors present a novel sensitive and robust electron beam-lithography lift off process using a commercially available chemically amplified positive tone 40XT photo resist. Ultra high resolution with sub-30 nm structures was already demonstrated with a good repeatability and ... more

Variable tunnelling barriers between isolated nanosized metal grains as key element for a new sensor concept
Florian Kolb1, 2, 3, Kerstin Schmoltner3, Michael Huth4, Andreas Hohenau5, Joachim Krenn5, Andreas Klug3, Emil J.W. List-Kratochvil3, 6 and Harald Plank1, 2, 1 Institute for Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, A-8010 Graz, Austria 2 Graz Centre for Electron Microscopy

The development of simple gas sensing concepts is still of great interest for science and technology. Ideally, a sensing device would be fabricated in a single-step procedure, providing sensitive, analyte-selective, quantitative and reversible performance characteristic without t ... more

LOW VOLTAGE OFETS AND MIS DIODES UTILIZING ANODIZED ALUMINIUM OXIDE
K. Koren, K. Schmoltner, J. Kofler, A. Klug and E. J. W. List, NanoTecCenter Weiz Forschungsgesellschaft mbH, Weiz, Austria & Institute of Solid State Physics, Graz University of Technology, Austria

Organic field-effect transistors (OFETs) are highly promising candidates for chemical and biological sensing. Many organic compounds are solution-processable at low temperatures on a variety of substrates, which allows for cost-effective fabrication methods, leading to smart (dis ... more

Xylan adsorption onto Cellulosic Surfaces
A. Miletzky1,2,3, M. Punz4, H. Weber5, R. Krasser6, A .Zankel7, C. Ganser8, W. Bauer1,3, R. Schennach2,3, 1 Institute for Paper-, Pulp- and Fiber Technology, Graz University of Technology 2 Institute of Solid State Physics, Graz University of Technology 3 Christian

Extracted xylan from beech dissolving pulp and eucalyptus kraft pulp was precipitated on unrefined, bleached, once-dried softwood kraft pulp and sulfite pulp. The temperature, pH, ionic strength, xylan concentration, pulp consistency, and the dwell time were analyzed regarding th ... more

Highly Efficient Color‐Stable Deep‐Blue Multilayer PLEDs: Preventing PEDOT:PSS‐Induced Interface Degradation
Sebastian Nau1, Niels Schulte2, Stefanie Winkler3, Johannes Frisch4, Antje Vollmer3, Norbert Koch4, Stefan Sax1, Emil J. W. List‐Kratochvil1,5, (1)NanoTecCenter Weiz Forschungsgesellschaft mbH Franz‐Pichler Straße 32, A‐8160 Weiz (Austria) (2)Merck KGaA Frankfurter Str. 250, D‐64293 Da

Organic light emitting diodes are doubtless the most advanced application in the field of organic electronics; Impressive technological progress was achieved in the last decade not least because of the vital academic interest on this topic. To enable for large‐area and lo ... more

Air-stable Organic Field-Effect Transistors based on a Heterotriangulene Polymer
Kerstin Schmoltner, Schmoltner,1 Florian Schlütter,2 Milan Kivala,2 Martin Baumgarten,2 Stefanie Winkler,3,4 Roman Trattnig,1 Norbert Koch,3,4 Andreas Klug,1 Emil J. W. List1,5 and

The fast progress in research on novel small molecule and π-conjugated polymer based organic semiconductors contributed to successful realizations of simple electronic circuits for low-cost radiofrequency identification tags, flexible large-area displays, as well as for sens ... more

Research on Li-air Batteries: Ionic Conductivity of Nanocrystalline Lithium Peroxide Li2O2
Andreas Dunst, Viktor Epp, Stefan Freunberger and Martin Wilkening, Christian-Doppler Laboratory for Lithium Batteries, Graz University of Technology, Institute for Chemistry and Technology of Materials, Stremayrgasse 9, A-8010

Lithium air batteries cause tremendous interest not only from the part of scientific community but also from an industrial point of view. The specific energy of lithium air batteries is 5 to 10 times that of a conventional lithium-ion battery [1,2]. Key applications in the long t ... more

Mapping surface plasmons in the nanometer regime
Franz-Philipp Schmidt1,2, Harald Ditlbacher2, Ulrich Hohenester2, Ferdinand Hofer1, and Joachim R. Krenn2, 1 Institute for Electron Microscopy and Nanoanalysis (FELMI), Graz University of Technology, 8010 Graz, Austria 2 Department of Physics, University of Graz, 801

Surface plasmons are density waves of electrons, which are propagating at a metallic surface. They are generated at optical frequencies and show confinement into areas much smaller than the wavelength of light, which causes a strong increase of the electric field intensities. Thi ... more

Ressourceneffizienter, umweltfreundlicher Beton
Juhart, J; Nickel, C; Mittermayr, F; Passer, A; David, A; Mustafa, N; Panik, R, Institut für Materialprüfung und Baustofftechnologie

Beton könnte durch innovative Technologie und effizienten Einsatz von Rohstoffen ökologisch sinnvoller hergestellt werden als bisher üblich. Ziel der Forschung der „Arbeitsgruppe Betontechnologie“ am Institut für Materialprüfung und Baustofftechnologie ist es deshalb, B ... more

Assessing the surface cracking susceptibility during continuous casting of in-situ melted and solidified steels
O. Caliskanoglu, S. Ilie, C. Beal and C. Sommitsch, Institut für Werkstoffkunde und Schweißtechnik

Apart from the chemical composition, the temperature cycles and the various stresses arising from the continuous casting process strongly influence the hot ductility behavior and thus the cracking susceptibility of steels. The hot ductility of as-cast constructional C-Mn steel ha ... more

Der instrumentierte Kerbschlagbiegeversuch zur detaillierten Betrachtung des Bruchverhaltens
Monika Schuler, Raphaela Rauter, Kurt Kerschbaumer, Norbert Enzinger, Institut für Werkstoffkunde und Schweißtechnik

Der instrumentierte Kerbschlagbiegeversuch nach ÖNORM EN ISO 14556 wird verwendet, um zusätz-lich zur Kerbschlagarbeit in Joule auch eine Kraft-Durchbiegungskurve zu ermitteln. Proben gleicher Kerbschlagarbeit können dabei unterschiedliche Kraft-Durchbiegungsverläufe aufweise ... more

Electrical In-Situ Characterisation of Organic Thin Film Transistors
B. Striedinger, A. Fian, R. Lassnig, A. Winkler, B. Stadlober, Joanneum Research Materials

Organic thin film transistors (OTFTs) are an emerging technology in the broad field of organic electronics. They are a key building block for many contemplated and widely discussed future applications with RFID-tags and backplanes for flexible displays amongst the most prominent ... more

Exploring polymer/nanoparticle hybrid solar cells in tandem architecture
Verena Kaltenhauser, Kaltenhauser, Thomas Rath, Michael Edler, Angelika Reichmann, Gregor Trimmel

Organic tandem solar cells have attracted much attention in recent years as the efficiencies of tandem devices can exceed the efficiencies which are possible with single junction solar cells. Tandem solar cells offer the possibility to harvest a broader part of the solar spectrum ... more

Attachment-limited nucleation and growth of organic films: Pentacene on sputter modified mica (001)
Levent Tumbek, Institut für Festkörperphysik

The morphology of organic thin films is crucial for the functionality of organic electronic devices. Understanding the initial growth and formation of organic thin films requires a detailed description of island nucleation. The island density as a function of the deposition rate ... more

CHEMICAL AND ISOTOPIC COMPOSITION OF SOIL SOLUTIONS FROM CAMBISOLS IN STYRIA (AUSTRIA) – SEASONAL VARIATIONS AND EXPERIMENTS
Schön Walter (1) , Dietzel Martin (1), Leis Albrecht (2), (1) Institute of Applied Geosciences, Graz University of Technology, Rechbauerstraße 12, 8010 Graz, Austria (2) Institute of Water, Energy and Sustainability, J

In most natural surroundings soil solutions are primary gained from the uptake of meteoric water. Subsequently infiltration, capillary exchange, bioresponse, evaporation etc. result in complex and individual gas-water-solid systems. Knowledge on the chemical and isotopic composit ... more

Novel Hydrosilane Precursors for Solution Based Silicon Deposition
Harald Stueger, Christoph Walkner, Andrea Temmel, Anorganische Chemie

Solution-based deposition and processing techniques for silicon attracted considerable attention just recently because they allow significant reduction of processing costs in the manufacture of devices such as light emitting diodes, thin film transistors or solar cells as compare ... more

Hypersensitive transitions of Eu3+: experimental and theoretical study
A. Wernbacher, C. Holzer, A.-M. Kelterer, K. Gatterer, Institute of Physical and Theoretical Chemistry

The rare earth ion Eu3+ is widely used in phosphor technology as a red luminophore, e.g. in colour television screens or on euro banknotes [1]. An interesting feature of rare earth ion spectra are hypersensitive transitions, which exhibit a significant intensity change if the env ... more

THE INFLUENCE OF IONIC LIQUID ELECTROLYTE STABILITY ON THE PROPERTIES OF ELECTROPLATED ALUMINIUM LAYERS
Patrick Kosmus (a,b), Luciana Vieira (a,b), Bernhard Gollas(a,b) and Oliver Steiner (c), aCEST, Viktor-Kaplan-Straße 2, 2700 Wiener Neustadt, Austria bICTM, Graz University of Technology, Graz, Austria cInstitute of Chemistry, Analytical Chemistry,

Ionic liquids (ILs) are a novel class of solvents with ionic character. The term ionic liquid is used for organic salts with melting points below 100°C. Up to now their use has been studied primarily in inorganic and organic synthetic chemistry with respect to sustainable and gr ... more

Li ION DYNAMICS IN ISOTOPE-DILUTED GLASSY Li2Si3O7 ― THE GENERATION OF PURE SPIN-3/2 JEENER-BROEKAERT NMR ECHOES
Dominik Wohlmuth,1 Viktor Epp,1 Ute Bauer,2 Anna-Maria Welsch,2 Harald Behrens2 and Martin Wilkening1, 1Christian-Doppler Laboratory for Lithium Batteries, Graz University of Technology, Institute for Chemistry and Technology of Materials, Stremayrgasse 9, 8010 G

Solid-state diffusion plays one of the most important roles in materials science. In particular, the precise measurement of ion dynamics in materials with structural disorder is of great interest. Spin-alignment echo (SAE) nuclear magnetic resonance (NMR), being comparable to exc ... more

ELECTROACOUSTIC IMPEDANCE MEASUREMENTS OF ELECTRODEPOSITION FROM HIGHLY VISCOUS LIQUIDS
Daniel Schloffer and Bernhard Gollas, Institute for Chemistry and Technology of Materials, Graz University of Technology

The electrochemical quartz crystal microbalance (EQCM) has been used to investigate interfacial processes at the electrode surface in liquids [1,2]. By means of measuring of the transfer function of the thickness-shear mode resonator and fitting to the modified Butterworth-Van Dy ... more

Investigation of performance limiting point defects in SiC MOSFETs using electrically detected magnetic resonance
Gernot Gruber, Institute of Solid State Physics, TU Graz; KAI GmbH
http://www.k-ai.at

Silicon carbide (SiC) is a promising semiconducting material for power applications. Its material properties are superior to silicon. In particular, SiC has a larger band gap, a higher breakdown field, and a higher thermal conductivity [1]. However, material processing is more ch ... more

In-Situ Wetting Investigations of Microfiltration Membranes in the ESEM
Manfred Nachtnebel, Institute for Electron Microscopy and Nanoanalysis

Polymeric microfiltration membranes are used in various fields of applications. They got installed for the separation of colloids and particles e.g. in medicine, science and water treatment. For future membrane developments and improvements, a better understanding of the inner mi ... more

NAWI Physics Doctoral Seminar Thursday 24 October 2013      AT02002J

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Emission characteristics of GaN and AlGaInP based Light Emitting Diodes
Reinhold Hetzel , Institute of Solid State Physics, TU Graz
http://www.if.tugraz.at

The junction temperature of electroluminescence devices is a key parameter which influences optoelectronic properties of Light Emitting Diodes (LEDs). Hence efficiency, light output, reliability and lifetime are strongly linked to this device parameter. Altering the junction temp ... more

Steady-state characteristics of correlated quantum many-body systems out of equilibrium: applications to quantum dots and molecular junctions
Martin Nuss, Institute of Theoretical and Computational Physics, Graz University of Technology
http://itp.tugraz.at/~06nuss/presentations.html

The theoretical understanding of the non-equilibrium behavior of strongly correlated quantum many-body systems is a long standing challenge, which has become increasingly relevant with the progress made in the fields of molecular-and nano- electronics, spintronics, spectroscopy o ... more

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Interaction effects in Helium Atom Scattering from semimetal Surfaces
Patrick Kraus, Institute of Experimental Physics

Helium Atom Scattering (HAS) is used for the investigation of surfaces because of its property of being strictly surface sensitive. Elastic and inelastic HAS experiments reveal facts about the periodicity and the corrugation of the surface structure as well as the surface phonon ... more

Electrolyte-gated organic field-effect transistor for sensing applications in aqueous media
Kerstin Schmoltner, NanoTecCenter Weiz Forschungsgesellschaft m.b.H.

Organic field-effect transistors (OFETs) are highly promising candidates for chemical and biological sensing. Owing to their intrinsic amplification, OFET based sensors typically reveal a high sensitivity. In conjunction with the outstanding features of organic electronic devices ... more

Enzymatic Cellulose Hydrolysis: New Approaches in the Investigation of Biocatalytic Processes via In-situ Liquid Atomic Force Microscopy
Thomas Ganner , Stephanie Rosker , Manuel Eibinger , Claudia Mayerhofer Patricia Bubner , Bernd Nidetzky , Harald Plank, Felmi-Zfe

Cellulose, a biopolymer consisting of linked sugar molecules as polymer-units, is used by plants as a structural compound in their cell walls. It is the most abundant polymer of this kind on earth and by degrading it to sugar and further into ethanol it is a valuable resource of ... more
Presentation file: Oberseminar.pptx

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Focused ion beam processing of low melting polymers: new perspectives due to optimized patterning strategies.
Roland Schmied , Center for Electron Microscopy
http://www.felmi-zfe.at

During the last decade focused ion beam (FIB) processing became of increased importance due to its unique possibilities of site specific specimen manipulation. So far, FIB processing has been well established for transmission electron microscopy related ultrathin lamella preparat ... more

A SIMULATION PROCEDURE FOR LIGHT-MATTER INTERACTION AT DIFFERENT LENGTH SCALES
Claude Leiner, Joanneum Research Materials Weiz

The development of photonic devices with tailor-made optical properties requires the control and the manipulation of light propagation within structures of different length scales, ranging from sub-wavelength to macroscopic dimensions. However, optical simulation at different len ... more

Simultaneous photoacoustic and laser-ultrasound imaging
Gerhild Wurzinger, University of Graz, Institute of Physics, KFU
http://physik.uni-graz.at/exp/magnetometrie/magnetometrie.php

The photoacoustic (PA) effect describes the excitation of an ultrasonic (US) wave after irradiating an object with a short laser pulse. Absorption of the diffusely propagating light in tissue leads to a localized temperature rise followed by thermoelastic expansion and the launch ... more