A5003861455- ZnO doping and properties
- Graphene research and applications
- Semiconductor materials and devices
- Transition Metal Oxide Nanomaterials
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Intermetallics and Advanced Alloy Properties
- Copper-based nanomaterials and applications
- Microfluidic and Capillary Electrophoresis Applications
- Electronic and Structural Properties of Oxides
- Nanopore and Nanochannel Transport Studies
- Carbon Nanotubes in Composites
- Thin-Film Transistor Technologies
- Engineering Technology and Methodologies
- Ga2O3 and related materials
- Metal and Thin Film Mechanics
- Field-Flow Fractionation Techniques
- Heat Transfer and Boiling Studies
- Material Properties and Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced ceramic materials synthesis
- Nuclear materials and radiation effects
- Microfluidic and Bio-sensing Technologies
- Plasma Applications and Diagnostics
- Silicon Nanostructures and Photoluminescence
Trinity College Dublin
2019-2025
Nazarbayev University
2014-2025
The ability of VO2 to undergo semiconductor-to-metal phase transition (SMT) upon heating makes it a very attractive material for uncooled bolometers. SMT represents large temperature coefficient resistance, which is an important parameter the development highly responsive microbolometers. However, other characteristics such as its high (341.2 K), sharpness transition, hysteresis, and room resistivity limit performance this in In work, we grow high-quality epitaxial ultrathin film on c-plane...
Abstract Titanium (Ti)-doped hematite (α-Fe 2 O 3 ) films were grown in oxygen-depleted condition by using the spray pyrolysis technique. The impact of post-deposition annealing oxygen-rich on both conductivity and water splitting efficiency was investigated. X-ray diffraction pattern revealed that are rhombohedral α-Fe structure dominantly directed along (012). as-grown found to be highly conductive with electrons as majority charge carriers (n-type), a carrier concentration 1.09×10 20 cm...
Abstract High-quality epitaxial p-type V 2 O 3 thin films have been synthesized by spray pyrolysis. The exhibited excellent electrical performance, with measurable mobility and high carrier concentration. conductivity of the varied between 115 1079 Scm −1 while optical transparency ranged from 32 to 65% in visible region. observed limitations thinner films’ were attributed nanosized granular structure presence two preferred growth orientations. 60 nm thick film demonstrated a highly...
Significant advancements have been made in the past few decades precise control of VO2 synthesis, enabling creation structures with diverse morphologies and distinct phase transition properties. Existing synthesis methods used research settings are often inadequate for large-scale production, particularly concerning high-quality thin films. Addressing these obstacles is crucial to unlocking full potential harnessing its multifunctional properties a broad range practical applications. In this...
In this report, 38 nm-thick amorphous zinc–tin oxide (a-ZTO) films were deposited by radio frequency magnetron cosputtering. a-ZTO annealed in situ monitoring of the sheet resistance improvements during annealing process. A sharp drop slope curve was observed. The activation energies for calculated. energy reaction a is much higher than rest slope. Based on values, six temperatures selected to saturate highest conductivity at lower and identify effects associated with time. We found direct...
The electronic and optical properties of transparent conducting oxides (TCOs) are closely linked to their crystallographic structure on a macroscopic (grain sizes) microscopic (bond structure) level. With the increasing drive towards using reduced film thicknesses in devices growing interest amorphous TCOs such as n-type InGaZnO 4 (IGZO), ZnSnO 3 (ZTO), p-type Cu x CrO 2 , or ZnRh O task gaining in-depth knowledge crystal by conventional X-ray diffraction-based measurements becoming...
Combustion of the metal, magnesium, and aluminum oxides based multicomponent systems in revolving reactor has been studied. Mullite, corundum, spinels have synthesized out-of-furnace by means self-propagating high-temperature synthesis. Both composition structure ceramic materials identified using certain correlation initial components centrifugal acceleration rate. The conditions synthesizing tubular combustion magnesium – oxide nickel system determined. tube represented corundum spinel.
Multiscale study of single and multilayer graphene irradiation is presented in this paper. Ab-initio density-functional theory (DFT) was used to point defects, a large scale parallel molecular-dynamics (MD) simulations were for studying formation gas cluster ion impacts. Moreover, Raman spectra pure defect samples studied from DFT calculations. Threshold energies creating craters on the surface obtained MD compared with published papers. The results also experimental shape.
The method of producing clusters various metals by using self-propagating high-temperature synthesis (SHS) in the conditions high-speed rotation is presented. purpose a study development technology acceleration strong- endothermic reactions and ceramic materials products. task experimental consists observation wave combustion effective layer, determination coordinate its passage adiabatic regime arrangement here less layer for obtaining gradient composite materials. possibility output...
Extension of the possibilities using SHS based on combustion with aim to obtain impurity-free alloys, special ceramic materials enhanced strength and thermal characteristics due effect centrifugal acceleration is a practical task this investigation. The use centripetal force in method layer oxide systems opens prospect high temperature effects for creation wide spectrum target products differing composition properties.
Gas cluster ion beams are proposed as a new tool for producing nanometer sized holes in ultrathin 2D films. Surfaces of films graphene, graphene oxide, MoS2, and HOPG, also silicon reference, were irradiated by Ar gas (Exogenesis Corporation, Billerica, MA USA). The results analyzed using atomic force microscopy (AFM) Raman spectroscopy. acceleration energy was 30 keV total fluences ranged from 1×108 to 1×1013 cm-2. Uniformly distributed holes, typically the range 10 25 nanometers diameter,...
Comsol finite element technique was applied to study heating and cooling of a microspot on the cathode surface. The reasons why there seems be no common model for vacuum arcs, in spite importance this field level effort expended over more than one hundred years, were explored.