A5037057184- Advanced Thermoelectric Materials and Devices
- ZnO doping and properties
- Mechanical and Optical Resonators
- Copper-based nanomaterials and applications
- Nanowire Synthesis and Applications
- Electronic and Structural Properties of Oxides
- Gas Sensing Nanomaterials and Sensors
- Topological Materials and Phenomena
- Graphene research and applications
- Advanced MEMS and NEMS Technologies
- GaN-based semiconductor devices and materials
- Physics of Superconductivity and Magnetism
- Advanced Sensor and Energy Harvesting Materials
- Transition Metal Oxide Nanomaterials
- Photonic and Optical Devices
- Force Microscopy Techniques and Applications
- Thermal Expansion and Ionic Conductivity
- Advanced Radiotherapy Techniques
University of Latvia
2019-2023
Liga Contra el Cancer
2022
The near-room temperature thermoelectric properties of self-assembling ZnO nanowire networks before and after encapsulation in nonconductive polymers are studied. were synthesized via a two-step fabrication technique involving the deposition metallic Zn by thermal evaporation, followed oxidation. Synthesized encapsulated polyvinyl alcohol (PVA) or commercially available epoxy adhesive. Comparison electrical resistance Seebeck coefficient showed significant increase network's conductivity...
Size distribution, Young’s moduli and electrical resistivity are investigated for CuO nanowires synthesized by different thermal oxidation methods. Oxidation in dry wet air were applied synthesis both with without an external field. An increased yield of high aspect ratio diameters below 100 nm is achieved combining electric field growth conditions additional water vapour at the first stage synthesis. determined from resonance bending experiments show similar diameter dependencies increase...
This work presents the synthesis of novel copper oxide-multiwalled carbon nanotube (CuO-MWCNT) hybrid nanostructured composites and a systematic study their thermoelectric performance at near-room temperatures as function MWCNT wt% in composite. The CuO-MWCNT were synthesized by thermal oxidation thin metallic Cu layer pre-deposited on network. resulted complete incorporation MWCNTs CuO matrix. properties fabricated compared with networks prepared mechanical mixing previously reported [CuO]
Mechanical resonance and bending tests on crystalline GeSn nanowires revealed size-dependent Young's moduli strengths close to theoretical values.
Electrostatically actuated nanoelectromechanical (NEM) switches hold promise for operation with sharply defined ON/OFF states, high current ratio, low OFF state power consumption, and a compact design. The present challenge the development of system (NEMS) technology is fabrication single nanowire based NEM switches. In this work, we demonstrate first application CuO nanowires as switch active elements. We develop bottom-up top-down approaches fabrication, such synthesis, lithography,...
In this work, a simple catalyst-free physical vapor deposition method is optimized by adjusting source material pressure and evaporation time for the reliable obtaining of freestanding nanoribbons with thicknesses below 15 nm. The optimum synthesis temperature, were determined an increased yield ultrathin Bi2Se3 8–15 Physical electrical characterization synthesized nm revealed no degradation properties nanoribbons, as well absence contribution trivial bulk charge carriers to total...
The yield and morphology (length, width, thickness) of stoichiometric Bi2Se3 nanoribbons grown by physical vapor deposition is studied as a function the diameters areal number density Au catalyst nanoparticles mean 8–150 nm formed dewetting layers thicknesses 1.5–16 nm. highest reached when synthesized on dewetted 3 thick layer (mean diameter ~10 nm) exceeds nanoribbon obtained in catalyst-free synthesis almost 50 times. lengths are directly proportional to nanoparticles. In contrast, widths...
This work is devoted to the development of epoxy-encapsulated zinc oxide-multiwalled carbon nanotubes (ZnO-MWCNT) hybrid nanostructured composites and investigation their thermoelectric performance in relation content MWCNTs composite. For preparation nanocomposites, self-assembling Zn networks were coated with a layer dispersed subjected thermal oxidation. The resulting ZnO-MWCNT encapsulated commercially available epoxy adhesive. It was found that encapsulation adhesive resulted...
Electrochemical impedance spectroscopy was applied for studying copper oxide (CuO) nanowire networks assembled between metallic microelectrodes by dielectrophoresis. The influence of relative humidity (RH) on electrical characteristics the CuO nanowire-based system assessed measurements Z. A slight increase Z with increasing RH at low followed a three orders magnitude decrease above 50-60%. two opposite trends observed across range examined 5-97% can be caused water chemisorption and...