A5025664562- Molecular Junctions and Nanostructures
- Organic Electronics and Photovoltaics
- Porphyrin and Phthalocyanine Chemistry
- Magnetic properties of thin films
- Organic Light-Emitting Diodes Research
- ZnO doping and properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magneto-Optical Properties and Applications
- Magnetism in coordination complexes
- Thin-Film Transistor Technologies
- Conducting polymers and applications
- Surface Chemistry and Catalysis
- Electronic and Structural Properties of Oxides
- Photochemistry and Electron Transfer Studies
- Luminescence and Fluorescent Materials
- Semiconductor materials and devices
- Characterization and Applications of Magnetic Nanoparticles
- Gold and Silver Nanoparticles Synthesis and Applications
- Force Microscopy Techniques and Applications
- 2D Materials and Applications
- Spectroscopy and Quantum Chemical Studies
- Copper-based nanomaterials and applications
- Semiconductor Quantum Structures and Devices
- Quantum Dots Synthesis And Properties
Chemnitz University of Technology
2016-2025
Material Physics Center
2020
University of Florence
2008-2009
National Interuniversity Consortium of Materials Science and Technology
2008-2009
Princeton University
2009
SLAC National Accelerator Laboratory
2009
Stanford University
2009
Imperial College London
2003
Institute of Semiconductor Physics
2001
Babeș-Bolyai University
1999-2000
Abstract Magneto-optical (MO) effects, viz. magnetically induced changes in light intensity or polarization upon reflection from transmission through a magnetic sample, were discovered over century and half ago. Initially they played crucially relevant role unveiling the fundamentals of electromagnetism quantum mechanics. A more broad-based relevance wide-spread use MO methods, however, remained quite limited until 1960s due to lack suitable, reliable easy-to-operate sources. The advent...
Epitaxial films and ordered arrays of submicron structures nickel cobalt ferrites were deposited on Nb doped SrTiO3 by pulsed laser deposition. X-Ray diffraction atomic force microscopy showed that the have a good crystalline quality smooth surfaces. A larger number phonon bands was observed in polarization dependent Raman spectra ferrite than expected for cubic spinel structures. This is explained short range ordering Ni2+ (or Co2+) Fe3+ cations at octahedral sites inducing lowering...
Abstract The use of an appropriate delivery system capable protecting, translocating, and selectively releasing therapeutic moieties to desired sites can promote the efficacy active compound. In this work, we have developed a nanoformulation which preserves its magnetization load model anticancerous drug explore controlled release in cancerous environment. For preparation nanoformulation, self-assembled magnetic nanospheres (MNS) made superparamagnetic iron oxide nanoparticles were grafted...
Organic diodes consisting of molecular nano-pyramid structures sandwiched between metal and strained nanomembrane electrodes are created. The robust smooth contacts provided by self-curled layers render the nano-pyramids efficent channels for detecting nitrogen dioxide airflow.
The influence of the substrate temperature on pulsed laser deposited (PLD) CoFe2O4 thin films for supercapacitor electrodes was thoroughly investigated. X-ray diffractometry and Raman spectroscopic analyses confirmed formation phase at a 450 °C. Topography surface smoothness measured using atomic force microscopy. We observed that room showed improved electrochemical performance supercapacitive properties compared to those Specific capacitances about 777.4 F g-1 258.5 were obtained RT °C,...
Exposure of organisms to nanoplastics (NPs) is inevitable given their global abundance and environmental persistence. Polyethylene terephthalate (PET) a common plastic used in wide range products, including clothing food beverage packaging. Recent studies suggest that NPs can cross the blood-brain barrier cause potential neurotoxicity. It widely known aggregation amyloid beta (Aβ) peptides brain pathological hallmark Alzheimer's disease (AD). While impact such as polystyrene (PS) on...
Exposure of organisms to nanoplastics (NPs) is inevitable given their global abundance and environmental persistence. Polyethylene terephthalate (PET) a common plastic used in wide range products, including clothing food beverage packaging. Recent studies suggest that NPs can cross the blood-brain barrier cause potential neurotoxicity. It widely known aggregation amyloid beta (Aβ) peptides brain pathological hallmark Alzheimer’s disease (AD). While impact such as polystyrene (PS) on has been...
Polyalanine molecules (PA) with an α-helix conformation have recently attracted a great deal of interest, as the propagation electrons through chiral backbone structure comes along spin polarization transmitted electrons. By means scanning tunneling microscopy and spectroscopy under ambient conditions, PA adsorbed on surfaces epitaxial magnetic Al2O3/Pt/Au/Co/Au nanostructures perpendicular anisotropy were studied. Thereby, correlation between ordering at surface electron across this hybrid...
Bulky organic semiconductors have been widely applied on a variety of devices including transistors, sensors, and light-emitting diodes. Recently, the capability producing stable ultrathin semiconductor-based junctions has opened possibility novel device concepts, high-speed spin valves, biosensors. In such context, investigation charge transport mechanisms across is key for engineering emerging organic-based technologies. Here, heterojunctions based physisorbed copper phthalocyanine gold...
Abstract We present the development of multifunctional blue-emission organic light-emitting diodes (OLEDs) using TADF-exciplex materials. These OLEDs exhibit sensitivity to external stimuli and achieve a maximum quantum efficiency (EQE) 11.6% through partly liquid processing. This technique allows for large-scale production on arbitrary geometries. The potential multifunctionality devices arises from their response low magnetic fields (up 100 mT) with an up 2.5% magnetoconductance, while...
Thin films of organic molecular semiconductors from the class phthalocyanines are investigated by means magneto-optical Kerr effect (MOKE) spectroscopy at room temperature. A numerical analysis energy dispersion real and imaginary part complex rotation angle in visible to near ultraviolet spectral range allows first determination material constant, so-called Voigt for a results compared density-functional theory calculations. The constant is only 1--2 orders magnitude smaller with soft...
The optical constants together with the magneto-optical Voigt of several phthalocyanine (Pc) and methoxy functionalized tetraphenylporphyrin (TMPP) thin films prepared on silicon substrates are presented. materials investigated MePc Me = Fe, Co, Ni, Cu, Zn MeTMPP Ni. We also compared our results to metal-free H2Pc, H2TPP H2TMPP. experimental will be supported by electronic structure calculations based density functional theory (DFT) interpreted using perimeter model initially proposed Platt....
The geometrical structure of potassium-doped Alq3 [tris-(8-hydroxyquinoline) aluminum] and the interaction between molecule potassium were studied using infrared reflection absorption spectroscopy (IRRAS), surface-enhanced Raman scattering (SERS), density functional theory calculations. A major aim this study was to examine theoretically predicted isomerization molecules from meridional form facial upon alkali-metal doping. observed spectra show significant changes with deposition on a thin...
The interface formation between manganese phthalocyanine (MnPc) and cobalt was investigated combining ultraviolet photoelectron spectroscopy inverse spectroscopy. transport band gap of the MnPc increases with film thickness up to a value (1.2 ± 0.3) eV while optical as determined from spectroscopic ellipsometry amounts 0.5 eV. values are smaller compared other phthalocyanines due metallic Mn 3d states close Fermi level. found open upon air exposure result disappearance occupied electronic states.
We demonstrate that the direction of all-optical switching (AOS) in rare-earth transition-metal (RE-TM) alloy Tb-Fe thin films depends on orientation sublattice magnetization and not resulting net magnetization. For this purpose, we investigated AOS ability for a sample dominated by Fe (Tb24Fe76) another Tb (Tb30Fe70). This finding dependence contributes to understanding RE-TM multilayered heterostructures.
Ferromagnetism can occur in wide-band gap semiconductors as well carbon-based materials when specific defects are introduced. It is thus desirable to establish a direct relation between the and resulting ferromagnetism. Here, we contribute revealing origin of defect-induced ferromagnetism using SiC prototypical example. We show that long-range ferromagnetic coupling be attributed p electrons nearest-neighbor carbon atoms around VSiVC divacancies. Thus, traced down its microscopic, electronic origin.