A5071675625- Graphene research and applications
- Carbon Nanotubes in Composites
- Diamond and Carbon-based Materials Research
- Thermography and Photoacoustic Techniques
- Chalcogenide Semiconductor Thin Films
- 2D Materials and Applications
- GaN-based semiconductor devices and materials
- Hygrothermal properties of building materials
- Heat Transfer and Optimization
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Advanced Sensor Technologies Research
- MXene and MAX Phase Materials
- Radiative Heat Transfer Studies
- Heat Transfer and Boiling Studies
- 3D Surveying and Cultural Heritage
- Semiconductor materials and devices
- Semiconductor Quantum Structures and Devices
- Graphene and Nanomaterials Applications
- Climate change and permafrost
- Thermal properties of materials
- Quantum Dots Synthesis And Properties
- Electrocatalysts for Energy Conversion
- Geothermal Energy Systems and Applications
- Advanced battery technologies research
Slovak University of Technology in Bratislava
2013-2025
Slovak Academy of Sciences
2006-2023
Institute of Physics of the Slovak Academy of Sciences
2006-2023
Institute of Chemistry of the Slovak Academy of Sciences
2015-2022
Danubia NanoTech (Slovakia)
2012-2020
Instituto Nacional del Carbón
2019
Czech Academy of Sciences, Institute of Physics
2008-2015
Physikalisch-Technische Bundesanstalt
2005
Abstract A synthesis and characterization of luminescent nano‐heterostructures consisting CdSe nanorod (NR) cores a ZnO shell with up to three monolayers is reported. The core/shell heterostructures show tunable, dual photoluminescence (PL) in visible Near Infrared (NIR) spectral ranges. Upon shelling the PL band attributed carrier recombination within core shifts lower energy by ≈0.05 0.15 eV relative bare NRs, due reduced quantum confinement. NIR band, observed ≈0.4 – 0.5 below core,...
Aberration-corrected transmission electron microscopy of the atomic structure diamond–graphite interface after Ni-induced catalytic transformation reveals graphitic planes bound covalently to diamond in upright orientation. The covalent attachment, together with a significant volume expansion graphite transformed from diamond, gives rise uniaxial stress that is released through plastic deformation. We propose comprehensive model explaining Ni-mediated and bonding at as well mechanism...
Diamond and graphene are carbon allotropes with starkly different physical characteristics. Their combination into graphene-on-diamond heterostructures could benefit from the complementary properties of both components. Graphitization single-crystalline diamond surfaces is a promising synthesis route, but clear understanding growth or graphite solid sources so far missing. Using aberration-corrected transmission electron microscopy, Raman spectroscopy, electrical transport measurements, we...
Catalyst layers play a crucial role in determining the performance of proton exchange membrane fuel cells (PEMFCs). However, deposition catalyst poses challenges PEMFC stack production due to complexity fabrication steps. Herein, we present simplified approach synthesize Pt nanostructures via spark ablation and simultaneously deposit them onto gas diffusion (GDL). The situ deposited on GDL serve as electrodes for electrode assembly (MEA) fabrication. Moreover, carrier process significantly...
Graphene oxide is a complex material whose synthesis still incompletely understood. To study the time evolution of structural and chemical properties oxidized graphite, samples at different temporal stages oxidation were selected characterized through number techniques: X-ray photoelectron spectroscopy for content bonding oxygen, diffraction level intercalation, Raman detection changes, electrical resistivity measurements probing charge localization on macroscopic scale, scanning...
Abstract Group III–V semiconductor multi-junction solar cells are widely used in concentrated-sun and space photovoltaic applications due to their unsurpassed power conversion efficiency radiation hardness. To further increase the efficiency, new device architectures rely on better bandgap combinations over mature GaInP/InGaAs/Ge technology, with Ge preferably replaced by a 1.0 eV subcell. Herein, we present thin-film triple-junction cell AlGaAs/GaAs/GaAsBi dilute bismide. A compositionally...
Carbon nanomaterials such as nanodiamond (ND) and graphene oxide (GO) attract increasing attention for biomedical applications due their unique adjustable properties. Here we report on antibacterial activity of NDs GO evaluated by bacterial colony counting. ND were used in oxidized (O‐ND, GO) or reduced (H‐ND, rGO) forms. are mixed Mueller–Hinton (MH) broth with Escherichia coli at the concentration 1 mg ml −1 . The resulting suspensions cultivated 5 24 h 37 °C a shaker. After each period,...
Abstract The distribution of alloyed atoms in semiconductors often deviates from a random which can have significant effects on the properties materials. In this study, scanning transmission electron microscopy techniques are employed to analyze Bi several distinctly MBE grown GaAs 1−x x alloys. Statistical quantification atomic-resolution HAADF images, as well numerical simulations, interpret contrast Bi-containing columns at atomically abrupt (001) GaAs-GaAsBi interface and onset CuPt-type...
The article investigates the thermophysical parameters of Turkey Oak particleboard with different densities and their response to varying heat pulse power cover possible thermally dependent disturbances during measurement. Samples were measured by Pulse Transient Method using a Cuboid Model estimate all basic Thermophysical parameters. aim was assess properties two particleboards high medium density compare them published data. For model we also calculated uncertainties based on sensitivity...
Abstract Carbon nanowalls (CNWs) were grown by atmospheric dc plasma enhanced chemical vapour deposition method. Maintaining at pressure give us possibility to synthetize CNWs high rate. By using two different liquid carbon sources we can control density. Growth of sparsely distributed be achieved ethanol, while hexane gives densely packed films.
Abstract In this article, we investigate the nanocomposite material formation, particularly deposition of nanocrystalline diamond and carbon nanowalls (CNWs) on single‐wall nanotubes buckypaper (BP). One part substrate was nucleated by nanodiamond powder. The growth carried out in a hot filament chemical vapor (HFCVD) system. Contact angle measurements, scanning electron microscopy, Raman spectroscopy were used for surface morphology analysis characterization phases. Due to different...
Abstract Enhancement of Raman scattering due to optical interference may act as a source error in the issues necessitating determination intensity. Its dependence on thin film thickness is conventional way how examine effects signal. To provide new platform for evaluation signal coming from substrate presence transparent capping, we investigate its relation reflectance ( R ) instead capping thickness. We derived theoretical model, which was experimentally tested simple structures consisting...
Two-dimensional (2D) van der Waals heterostructures combine the distinct properties of individual 2D materials, resulting in metamaterials, ideal for emergent electronic, optoelectronic, and spintronic phenomena. A significant challenge harnessing these future hybrid circuits is their large-scale realization integration into graphene interconnects. In this work, we demonstrate direct growth molybdenum disulfide (MoS2) crystals on patterned channels. By enhancing control over vapor transport...