A5025191759- Advanced Thermoelectric Materials and Devices
- Anodic Oxide Films and Nanostructures
- Force Microscopy Techniques and Applications
- Nanowire Synthesis and Applications
- Mechanical and Optical Resonators
- Topological Materials and Phenomena
- ZnO doping and properties
- Graphene research and applications
- 2D Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Carbon Nanotubes in Composites
- Advancements in Battery Materials
- Molecular Junctions and Nanostructures
- Thermal Radiation and Cooling Technologies
- Semiconductor materials and interfaces
- Electronic and Structural Properties of Oxides
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced MEMS and NEMS Technologies
- Thermal properties of materials
- Conducting polymers and applications
- Surface and Thin Film Phenomena
- Copper-based nanomaterials and applications
- Advanced Battery Materials and Technologies
- Semiconductor materials and devices
- Silicon Nanostructures and Photoluminescence
University of Latvia
2016-2025
Riga Stradiņš University
2023
Riga Technical University
2023
Liga Contra el Cancer
2022
Sumy State University
2019
Faculty (United Kingdom)
2019
University College Cork
2003-2009
Trinity College Dublin
2005-2009
National University of Ireland
2009
Chalmers University of Technology
1994-2006
Metallic nanowires of cobalt, copper, and iron oxide magnetite (Fe3O4) have been synthesized within the pores mesoporous silica using a supercritical fluid inclusion technique. The matrix provides means producing high density stable, hexagonally ordered arrays highly crystalline nanowires. formation metal mesopores was confirmed by transmission electron microscopy (TEM), N2 adsorption experiments, powder X-ray diffraction (PXRD). mechanism nanowire appears to occur through initial binding...
Nanolaminates are of great interest for their unique properties such as high dielectric constants and advanced mechanical, electrical, optical properties. Here we report on the tuning structural Al2O3/ZnO nanolaminates designed by atomic layer deposition (ALD). Structural were studied SEM, GIXRD, AFM. Optical characterization was performed transmittance photoluminescence (PL) spectroscopy. Complex study monolayer ellipsometry. Al2O3 ZnO calculated. The band gap single layers excitonic PL...
For high-performance lithium-ion batteries (LIBs), Bi 2 Se 3 /MXene/SWCNT heterostructures emerge as a possible anode choice.
Semiconducting nanowires (NWs) are important "building blocks" for potential electrical and electromechanical devices. Here, we report on the mechanical properties of supercritical fluid-grown Ge NWs with radii between 20 80 nm. An analysis bending tensile stresses during deformation failure reveals that while have a Young's modulus comparable to bulk value, they an ultimate strength 15 GPa, which is maximum theoretical these materials. This exceptional highest reported any conventional...
A study of transmittance and photoluminescence spectra on the growth oxygen-rich ultra-thin ZnO films prepared by atomic layer deposition is reported. The structural transition from an amorphous to a polycrystalline state observed upon increasing thickness. unusual behavior energy gap with thickness reflected optical properties attributed improvement crystalline structure resulting decreasing concentration point defects at grains. UV visible emissions correspond transitions near band-edge...
Zinc oxide (ZnO) and graphene (G) have been extensively studied because of their unique physical properties. Here, graphene–zinc (G/ZnO) nanolaminates were fabricated, respectively, by chemical vapor deposition low-temperature atomic layer technique. The number obtained G/ZnO layers was tuned from 1 to 11 with a total thickness 100 nm for all prepared nanolaminates. structure, optical properties, interaction between G ZnO X-ray methods, TEM, AFM, Raman, spectroscopy. results interpreted...
Abstract Knowledge of nucleation and further growth Bi 2 Se 3 nanoplates on different substrates is crucial for obtaining ultrathin nanostructures films this material by physical vapour deposition technique. In work, were deposited under the same experimental conditions types graphene (as-transferred post-annealed chemical grown monolayer graphene, silicon carbide substrate). Dimensions compared with dimensions mechanically exfoliated mica highly ordered pyrolytic graphite flakes used as...
We explored for the first time ability of a three-dimensional polyacrylonitrile/ZnO material—prepared by combination electrospinning and atomic layer deposition (ALD) as new material with large surface area—to enhance performance optical sensors volatile organic compound (VOC) detection. The photoluminescence (PL) peak intensity these one-dimensional nanostructures has been enhanced factor 2000 compared to flat Si substrate. In addition, phase transition ZnO ALD coating from amorphous...
We report on the influence of localized plasmons resonance dispersion function Au layer and strong enhancement UV PL peak in ZnO for Au/ZnO nanostructures synthesized by PVD/ALD.
Abstract Molecularly imprinted polymers are important tools for the design of sensors and other molecular recognition based analytical systems. In this paper development a photoelectrochemical sensor selective bisphenol determination is reported. The on glass/ZnO/MIP‐Ppy structure consisting glass modified by ZnO layer (glass/ZnO), which functionalized molecularly conducting polymer polypyrrole (MIP‐Ppy). sensitivity to in range 0.7–12.5 µ m . Selectivity tests bisphenolic compounds...
The development of semiconductor nanowires has recently been the focus extensive research as these structures may play an important role in next generation nanoscale devices. Using building blocks, a number high performance electronic devices have fabricated. In this review, we discuss synthetic methodologies and electrical characteristics Si, Ge, Ge/Si core/shell nanowires. particular fabrication properties variety nanowire-based field effect transistors (FETs) are discussed. Although...
ZnO nanorods grown by gaseous-disperse synthesis are confirmed XRD analysis to have the wurtzite crystal structure. The obtained crystallites, as found from SEM studies, 57 ± 9 nm in diameter and 470 30 long on average. Two emission bands of photoluminescence observed at room temperature centered 376 520 nm. A biosensitive layer is prepared immobilization anti-Salmonella antibodies liquid solutions surface. Immobilization onto increase intensity PL. After further reaction with Salmonella...
Plasmonic metal nanoparticles arranged in periodic arrays can generate surface lattice plasmon resonances (SLRs) with high Q-factors. These collective are interesting because the associated electromagnetic field is delocalized throughout plane of array, enabling applications such as biosensing and nanolasing. In most cases nanostructures created via top-down nanofabrication processes. Here we describe a capillary-force-assisted particle assembly method (CAPA) to assemble monodisperse...
Background/Objectives: Despite advances in diagnostic techniques, accurate classification of lung cancer subtypes remains crucial for treatment planning. Traditional methods like genomic studies face limitations such as high cost and complexity. This study investigates whether integrating atomic force microscopy (AFM) measurements with conventional clinical histopathological data can improve subtype classification. Methods: We developed analyzed a novel dataset combining clinical,...
We have investigated the conductance of gold point contacts using a scanning tunneling microscope (STM) inside transmission electron (TEM). Measuring these as function radius, we could directly compare it with theories both in ballistic regime (Sharvin) well diffusive (Maxwell). The width were between single atom and 20 nm. Using an interpolation formula (Wexler) two limits, obtain mean free path 4 nm, which is about ten times shorter than room-temperature bulk value. low value indicates...
We report a "clean" and fast process, utilizing supercritical carbon dioxide, for producing ultrahigh densities, up to 1012 nanowires per square centimeter, of ordered germanium on silicon quartz substrates. Uniform mesoporous thin films were employed as templates the nucleation growth unidirectional nanowire arrays orientated almost perpendicular substrate surface. Additionally, these nanocomposite materials display room-temperature photoluminescence (PL), energy which is dependent diameter...
A combined transmission electron microscopy-scanning tunneling microscopy (TEM-STM) technique has been used to investigate the force interactions of silicon and germanium nanowires with gold electrodes. The I(V) data obtained typically show linear behavior between electrode at all contact points, whereas linearity curves for were dependent on point contact. Bistable nanowire-based nanoelectromechanical programmable read-only memory (NEMPROM) devices demonstrated by TEM-STM. These nonvolatile...
A two-terminal bistable device, having both ON and OFF regimes, has been demonstrated with Ge nanowires using an in situ TEM−STM technique. The function of the device is based on delicately balancing electrostatic, elastic, adhesion forces between contacts, which can be controlled by applied voltage. operation failure conditions were investigated, i.e. influence nanowire diameter, surface oxide layer current density. During ON/OFF cycles observed to more stable than carbon nanotubes, working...
We present a simple two-stage vapour–solid synthesis method for the growth of bismuth chalcogenide (Bi2Te3, Bi2Se3) topological insulator nanowires/nanobelts by using Bi2Se3 or Bi2Te3 powders as source materials. During first stage process nanoplateteles, serving "catalysts" further nanowire/nanobelt growth, are formed. At second synthesis, introduction N2 flow at 35 Torr pressure in chamber induces formation free standing nanowires/nanobelts. The synthesised nanostructures demonstrate...
One way to improve characteristics of oxide coatings prepared by plasma electrolytic oxidation (PEO) method in suspensions lies variation solid particle properties. In this study, the effect crystallinity on different physicochemical properties and bioactivity Ti Ti6Al4V substrates was studied, repeatability resulting assessed depending selected substrates. PEO performed direct current mode at a voltage 350 V electrolytes containing 0.1 M KH2PO4 100 g.L-1 stoichiometric crystalline...