Institute of Solid State Physics

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Monday 28 September 2015      Hörsaal I, Alte Technik

Opening, Welcome
Klaus Reichmann

Nanoporous materials of single-atom thickness: Concept studies on graphene-based membranes and two-dimensional MOFs for molecular sieving
A. W. Hauser, Institute of Experimental Physics, Graz University of Technology

An increased demand for energy and the need to use natural resources more efficiently are widely recognized challenges of our time. Many emerging membrane-based environmental technologies including gas storage, gas separation or water filtration have not yet reached full maturity ... more

Vortex Assisted Growth of Metallic Nanowires in Superfluid Helium Droplets
A.Volk, Institute of Experimental Physics, Graz University of Technology

Helium droplets provide an ideal matrix for the aggregation of tailored metallic nanoclusters and nanowires. The vortex guided growth process of the wires in the superfluid helium environment is not fully understood yet. Silver represents a special case among the metals studied ... more

Formation of Ag-Au core-shell clusters in superfluid helium nanodroplets studied by atomic resolution electron tomography
P. Thaler, Institute of Experimental Physics, Graz University of Technology

The past decades have seen an increasing interest in metal nanoparticles, and especially in core-shell systems which offer great prospects in many fields of nanophysics, ranging from nanoelectronics to catalysis. We utilize superfluid helium droplets to grow Ag-Au core-shell na ... more

Electron Beam Induced Oxidation of Nickel Nanoclusters
D. Knez, Institute for Electron Microscopy and Nanoanalysis, Graz University of Technology

Electron beam induced oxidation and rearrangement of metallic nanostructures, driven by the nanoscale Kirkendall effect, was reported recently by several authors (1–3). This effect can be used as a new route for the modification of such structures with the high spatial resoluti ... more

Coffee Break

Anisotropy effect on the creep properties of a Al-Cu-Si-Mg alloy: from 1D specimen tests to material modelling and its experimental validation
Elisabetta Gariboldi, Departimento di Meccanica, Politecnico di Milano

The mechanical properties of aluminium alloy forgings are widely affected by the extent and direction of plastic flow as well as by their heat treatment. Further, when service conditions combine high temperature and mechanical loading, creep phenomena are involved and anisotropy ... more

In-situ observation of recrystallization in an AlMgScZr alloy
J. Taendl, Institute of Materials Science and Welding, Graz University of Technology, Graz, Austria

Static recrystallization in metals is classically studied as alternating series of heat treatments and microstructural investigations often combined with a modeling approach, in general using a JMAK-type of equation. For alloys with constant growth rates this approach requires on ... more

Analytical Electron Tomography of Aluminum Alloys with Nano-Precipitates and its Physical Challenges
A. Orthacker, Graz Centre for Electron Microscopy and Institute for Electron Microscopy and Nanoanalysis, Graz University of Technology

For a thorough understanding of a material, investigations at the nanoscale are often essential. Analytical techniques like electron energy loss spectroscopy (EELS) and energy dispersive X-ray spectroscopy (EDXS) in scanning transmission electron microscopy (STEM) can reveal impo ... more

Optimizing the environmental scanning electron microscope for the investigation of wet samples
H. Fitzek, Institute for Electron Microscopy and Nanoanalysis, Graz University of Technology

In environmental scanning electron microscopy applications in the kPa regime are of increasing interest for the investigation of wet and biological samples, because neither sample preparation nor extensive cooling is necessary [1]. Unfortunately the applications are limited by ... more

Lunch Break / Coffee

CVD of polymers from material properties to device fabrication
A. M. Coclite, Institute of Solid State Physics, Graz University of Technology

Functional thin films offer innovative solutions for many technological applications: organic electronics, smart devices for biotechnology, microfluidics, membrane technology, sensors and drug delivery systems. The development of functional thin films, engineered to achieve all t ... more

Polymorphism in Organic Thin Films
A.O.F. Jones, Institute of Solid State Physics, Graz University of Technology

An increase or change of structural order in the vicinity of a solid substrate is known for a wide variety of materials. For molecular materials crystallizing on a solid surface, it has been observed that new polymorphic forms may exist near the interface with the substrate which ... more

In-operando magnetic studies on Li-ion battery cathodes during charging/discharging
S. Topolovec, Institute of Materials Physics, Graz University of Technology

In-situ magnetic measurements during electrochemical charging, with the purpose to tune magnetic properties by electrochemical processes, have recently attracted considerable attention (i.e. [1-3]). As the magnetic properties of the technologically important Li-ion battery electr ... more

Small change ¨D great effect: Steep increase of Li ion dynamics in Li4Ti5O12 at the early stages of chemical Li insertion (x = 0.1, x = 0.3)
W. Schmidt, Christian Doppler Laboratory for Lithium Batteries, Institute of Chemistry and Technology of Materials, Graz University of Technology

Polycrystalline Li4+xTi5O12 (LTO, 0 < x ¡Ü 3) is one of the most promising negative electrode materials for lithium-ion batteries. It shows a flat Li insertion plateau of about 1.5 V vs. Li/Li+; its theoretic specific capacity is approximately 175 mAh/g. The increased use of LT ... more

Mechanochemistry of Fluorine Ion Conductors: Insights into Synthesis and
F. Preishuber-Pflügl, Christian Doppler Laboratory for Lithium Batteries, Institute of Chemistry and Technology of Materials, Graz University of Technology

Mechanochemistry is a powerful tool in solid-state chemistry, which is represented by some very recent, comprehensive reviews on this topic that outline the manifold potential of this technique.[1,2] For solid ion conductors, it has been demonstrated as a very useful method that ... more

Posters Monday 28 September 2015      Foyer Alte Technik

Hole-Transport Layers Beyond PEDOT:PSS – Low-Temperature Solution-Processed MoOx Derivatives in Organic Solar Cells
Huei-Ting Chien, Institute of Solid State Physics, Graz University of Technology

Organic photovoltaic cells (OPV) have received considerable attention as potential source of renewable energy for their advantages as easy fabrication, light weight, low manufacturing cost and mechanical flexibility. Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: ... more

SiC Nanoparticles from Laser Ablation of Sol-Gel Prepared Materials for Hybrid Solar Cells
O. Kettner, Institute of Solid State Physics, Graz University of Technology

Silicon carbide (SiC) is an interesting material for a lot of different fields, ranging from high power electronics, as high temperature stable wide-band gap semiconductor, to material engineering, with its high Mohs hardness of 9.6 and little sensitivity to degradation. One nove ... more

Fast Li Ion Transport in the Li7P3S11 Glass Ceramic as Seen by 6,7Li
D. Wohlmuth, Christian Doppler Laboratory for Lithium Batteries, Institute of Chemistry and Technology of Materials, Graz University of Technology

The glass ceramic Li7P3S11 (LPS), intensively studied by Tatsumisago [1], is a wellknown fast ion conductor [2]. Hence, it is undoubtedly a promising ceramic to be used in bulk-type all-solid-state batteries. The complex Li dynamics in LPS is, however, far from being understood c ... more

Preparation and Characterization of Conductive Cellulose Films
J. Köhler, Institute of Solid State Physics, Graz University of Technology

Cellulose is one of the most common polymers in nature and therefore a very attractive candidate as transparent electrode/substrate material in organic electronics. At present indium tin oxide (ITO)-coated glass or plastic substrates are commonly used as transparent conductive ... more

Mechanochemical synthesis and characterization of the metastable, nanocrystalline F ion conductor (BaxCay)La(1–x–y)F(3–x–y)
S. Breuer, Christian Doppler Laboratory for Lithium Batteries, Institute of Chemistry and Technology of Materials, Graz University of Technology

Solid ion conductors are important materials as they find applications in many electrochemical devices, e.g., in lithium-ion batteries, fuel cells or in super capacitors.[1] Compared to their liquid analogues they are expected to feature a number of advantages such as longer life ... more

Extremely High Li+ Diffusivity in NASICON-type Li1.5Al0.5Ti1.5(PO4)3
V. Epp, Christian Doppler Laboratory for Lithium Batteries, Institute of Chemistry and Technology of Materials, Graz University of Technology

The continuing demand for efficient electrochemical energy storage systems is hoped, in the medium term, to be met by rechargeable Li-based batteries. This requires improved battery characteristics in terms of power, capacity, longevity, and safety compared with the state-of-the- ... more

Synthesis and Characterisation of Naphthalimide functionalized polynorbronenes
M. Hollauf, Institute for Chemistry and Technology of Materials

1,8-Naphthalimide derivatives are highly fluorescent and photo stable and thus precursors for different applications e.g. in fluorescent synthetic polymers and textiles, fluorescent down shift materials as electro-optically sensitive materials, in laser technology, as liquid–c ... more

Filler Material Insertion for Electron Beam Welding of Thick Copper Components
C. Voglreiter, Institute of Materials Science and Welding, Graz University of Technology, Graz, Austria

Due to its high thermal and electric conductivity, copper (Cu) is used in industrial applications like cooling and in electric components. However, conventional welding of thick walled copper components can be difficult, due to the fast dissipation of the welding energy. Electron ... more

Determination of the self-assembled supermolecular structure of perylene bisimide and oxygenic polyoxometalates
M. Burian, Institute of Inorganic Chemistry, Graz University of Technology

Upon addition of perylene bisimide (PBI2+) to ruthenium polyoxometalate (RuPOM) in aqueous solution a spontaneous self-assembly into a nano-scaffold occurs. In both TEM and SEM images of the hybrid material various morphologies were observed from which no detailed information on ... more

Novel methods for testing the durability of eco-friendly concrete
C. Baldermann, Institute of Technology and Testing of Building Materials, Graz University of Technology

The development of so-called eco-friendly concrete has a huge potential in reducing the global warming potential (by up to 30%) and in particular in the lowering of primary energy input, i.e. by substitution of cement by eco-friendly additives and optimization of packing density. ... more

Hydrogels produced with Initiated Chemical Vapour Deposition
K. Unger, Institute of Solid State Physics, Graz University of Technology

A hydrogel is an unsolvable polymer network with hydrophilic groups. Properties like the swelling or the elastic modulus can be tuned by embedding additional functional groups during the manufacturing process. Synthesizing hydrogels with solution-based methods is often problemati ... more

Fluorinated Copolymers by Initiated Chemical Vapor Deposition
P. Christian, Institute of Solid State Physics, Graz University of Technology

Ion-conductive polymer membranes assume a crucial function in various modern-day technologies, ranging from fuel cell application to drug delivery or water treatment. [1] Nevertheless, a detailed understanding on the actual proton conduction mechanism is still missing and accessi ... more

Electronic, magnetic, and optical properties of manganese pnictides
M. Zingl, Institute of Theoretical and Computational Physics, Graz University of Technology

Strong electronic correlations happen very often in open d- or f- shells close to half filling. As an example of such systems we study BaMn2As2 and LaOMnAs, two manganese pnictides. They are similar to the extensively studied iron pnictide high-temperature supercondductors BaFe2A ... more

Lithium ion dynamics in amorphous Li-Si electrochemically prepared from semiconductor grade, monocrystalline silicon — An NMR Study
A. Dunst, Christian Doppler Laboratory for Lithium Batteries, Institute of Chemistry and Technology of Materials, Graz University of Technology

Silicon is one of the most promising anode materials for lithium-based rechargeable batteries. Provided the volume changes during Li uptake can be brought under control, Li ion diffusivity is expected to crucially determine the performance of such energy storage systems. Therefor ... more

Spatially Confined Li Diffusion in Channel-Structured LiBi3S5
B. Stanje, Christian Doppler Laboratory for Lithium Batteries, Institute of Chemistry and Technology of Materials, Graz University of Technology

The growing demand for clean and sustainable energy has created a pursuit of finding and developing new materials for the usage in energy storing devices especially for Li ion batteries. While usually the electrochemical properties of potential and novel candidates are extensivel ... more

Joining of tantalum titanium by electron beam technique for medical application
P. Christoefl, Institute of Materials Science and Welding, Graz University of Technology, Graz, Austria

Titanium and titanium alloys play an essential role as biomaterials to replace bone tissue that has become diseased or damaged. Although there are good experiences with the use of titanium, an aseptic loosening of the prostheses can be observed – under certain circumstances – ... more

Advanced evaluation of the instrumented Charpy V-notch test
B. Krenmayr, Institute of Materials Science and Welding, Graz University of Technology, Graz, Austria

One important material property in mechanical engineering is the fracture toughness, which describes the resistivity of the material against crack propagation. However, this material property is very expensive to evaluate. Therefore, a simplified technological test setup was intr ... more

Architecture-Specific Contributions to Short Channel Effects in Organic Transistors
A. F. Fernandez, Institute of Solid State Physics, Graz University of Technology

Organic thin film transistors still suffer from an insufficient stability and cannot compete with the performance of their inorganic counterparts. Nevertheless, highly promising advances in switching speeds were achieved upon aggressive scaling of device dimensions such as the ch ... more

Adsorption behavior of nonplanar GaCl-phthalocyanine on Cu(111): Geometric and electronic properties
E. Wruss, Institute of Solid State Physics, Graz University of Technology

The geometric and electronic properties of nonplanar chlorogallium-phthalocyanine GaClPc upon adsorption on Cu(111) are investigated, building on a study by Gerlach et al. [1]. There, X-ray standing wave (XSW) and ultraviolet photon spectroscopy (UPS) experiments in combination w ... more

Subphthalocyanine on Different Metal Surfaces
S. S. Harivyasi, Institute of Solid State Physics, Graz University of Technology

The detailed energetics of a metal-organic interface is influenced by multiple factors such as the nature of the interaction between the metal and the molecule as well as the geometry of the adsorbed molecule. Here we present our results from ab-initio calculations that analyze t ... more

Investigation of Defect Complexes in Silicon Generated by High Dose Proton Implantation
M. Faccinelli, Institute of Solid State Physics, Graz University of Technology

When silicon is implanted with high-energy protons, there is a peak in the concentration of hydrogen, vacancies and interstitials at the projected range of the protons. This projected range depends on the energy of the implanted protons. During a subsequent anneal, these defects ... more

Influence of oxide processing on the defects at the SiC-SiO2 interface measured by electrically detected magnetic resonance
Gernot Gruber, Institute of Solid State Physics

Silicon carbide (SiC) is a promising material for next generation power semiconductor devices. However, the development of SiC MOSFETs is still facing problems. The channel mobility is still significantly lower than the bulk mobility due to defects at the SiC/SiO2 interface. Anne ... more