A5086064980- Surface and Thin Film Phenomena
- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Advanced Chemical Physics Studies
- Semiconductor materials and devices
- Organic Electronics and Photovoltaics
- Catalysis and Oxidation Reactions
- Advanced Memory and Neural Computing
- Catalytic Processes in Materials Science
- Graphene research and applications
- Force Microscopy Techniques and Applications
- Acoustic Wave Resonator Technologies
- Topological Materials and Phenomena
- Catalysts for Methane Reforming
- nanoparticles nucleation surface interactions
- Porphyrin and Phthalocyanine Chemistry
- Mesoporous Materials and Catalysis
- Material Dynamics and Properties
- Theoretical and Computational Physics
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Thin-Film Transistor Technologies
University of Graz
2015-2025
Nawi Graz
2017-2025
Graz University of Technology
2014-2015
It is becoming accepted that ultrathin dielectric layers on metals are not merely passive decoupling layers, but can actively influence orbital energy level alignment and charge transfer at interfaces. As such, they be important in applications ranging from catalysis to organic electronics. However, the details molecular still under debate. In this study, we present a comprehensive analysis of phenomenon promoted by interlayer with comparative study pentacene adsorbed Ag(001) without an MgO...
Abstract Whether intentional or unintentional, thin dielectric interlayers can be found in technologies ranging from catalysis to organic electronics. While originally considered as passive decoupling layers, recently it has been shown that they actively promote charge transfer the underlying metal adsorbates. This charging have profound effects on surface chemistry of atoms, atomic clusters, and molecules, their magnetic moments, injection at contacts devices. Yet, controlled studies...
For weakly interacting adsorbate/substrate systems, the integer charge transfer (ICT) model describes how across interfaces depends on substrate work function. In particular, function regimes where no occurs (vacuum level alignment) can be distinguished from regions by electron tunneling to adsorbate or vice versa takes place (Fermi pinning). While formation of singly charged molecular anions and cations organic semiconductors various substrates has been well described this model, double...
Electronic surface hardening induced by oxygen atoms deposited on Cu(100) results in a true electronic and physical decoupling of adsorbed organic molecules.
In order to design catalytic materials, we need understand the essential causes for material properties resulting from its composite nature. this paper discuss two, at first sight, diverse aspects: (a) effect of oxide-metal interface on metal nanoparticle and (b) consequences particle modification after activation selectivity hydrogenation reactions. However, these two aspects are intimately linked. The nanoparticle's electronic structure changes as a catalyst is brought different reaction...
Metalation and self-metalation reactions of porphyrins on oxide surfaces have recently gained interest. The mechanism porphyrin oxides is, however, far from being understood. Herein, we show by a combination results obtained with scanning tunneling microscopy, photoemission spectroscopy, DFT computations, that the 2H-tetraphenylporphyrin surface ultrathin MgO(001) films is promoted charge transfer. By tuning work function MgO(001)/Ag(001) substrate, are able to control metalation state...
The fabrication of organic thin film transistors with highly reproducible characteristics presents a very challenging task. We have prepared and analyzed model pentacene under ultra-high vacuum conditions, employing surface analytical tools methods. Intentionally contaminating the gold contacts SiO2 channel area carbon through repeated adsorption, dissociation, desorption proved to be advantageous in creation devices stable parameters. mainly focused on device properties, such as mobility...
In this work we present
Polycyclic aromatic compounds with fused benzene rings offer an extraordinary versatility as next-generation organic semiconducting materials for nanoelectronics and optoelectronics due to their tunable characteristics, including charge-carrier mobility optical absorption. Nonplanarity can be additional parameter customize electronic properties without changing the core. In this work, we report a combined experimental theoretical study in which directly observe large, geometry-induced...
Two-dimensionally ordered monolayers of water on MgO(001) have been extensively studied in the past using diffraction and spectroscopic computational methods, but direct microscopic imaging has not reported so far. Here, we present a scanning tunneling microscopy (STM) study, supported by infrared X-ray photoelectron spectroscopy, c(4 × 2)-10H2O p(3 2)-6H2O structures prepared ultrathin MgO(001)/Ag(001) films. For applied conditions, contrast STM images originates from hydroxyl groups, which...
Ultrathin dielectric/insulating films on metals are often used as decoupling layers to allow for the study of electronic properties adsorbed molecules without interference from underlying metal substrate. However, presence such may effectively change electron donating substrate, example, by lowering its work function and thus enhancing charging molecular adsorbate layer through tunneling. Here, an experimental para -sexiphenyl (6P) ultrathin MgO(100) supported Ag(100) is reported. By...
We discuss in this paper two case studies related to nano-particle catalyst systems: one concerns a model system for the Cr/SiO<sub>2</sub> Phillips ethylene polymerization and other provides additional information on Au nano-particles supported ultrathin MgO(100)/Ag(100) films.
The strongly anisotropic adsorbate system Br/Pt(110) exhibits an anomalous order-order phase transition due to competition between interadsorbate repulsion and charge density wave (CDW) correlations. is preceded by fluctuations a normal $c(2\ifmmode\times\else\texttimes\fi{}2)$ on flat surface $(2\ifmmode\times\else\texttimes\fi{}1)$ involving periodic lattice distortion of the substrate. Here we study fluctuations, determine correlation length in real reciprocal space, report its evolution...
Abstract Das Interesse an Metallierungs‐ und Selbstmetallierungsreaktionen auf Oxidoberflächen ist in jüngster Zeit ständig gewachsen. Der Mechanismus der Selbstmetallierungsreaktion jedoch nicht vollständig geklärt. Hier zeigen wir mithilfe von Rastertunnelmikroskopie, Photoemissions‐Spektroskopie Dichtefunktionaltheorie‐Rechnungen, dass die Selbstmetallierung 2H‐Tetraphenylporphyrin Oberfläche ultradünnen MgO(001)‐Filmen durch Ladungstransfer ermöglicht wird. Es wird gezeigt,...