A5071257548- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Analytical Chemistry and Sensors
- ZnO doping and properties
- Advancements in Solid Oxide Fuel Cells
- Electrocatalysts for Energy Conversion
- Graphene research and applications
- Catalytic Processes in Materials Science
- Fuel Cells and Related Materials
- Transition Metal Oxide Nanomaterials
- Magnetic and transport properties of perovskites and related materials
- Luminescence Properties of Advanced Materials
- Advanced Sensor and Energy Harvesting Materials
- Advanced Chemical Sensor Technologies
- Advanced Sensor Technologies Research
- Diamond and Carbon-based Materials Research
- Acoustic Wave Resonator Technologies
- Advanced Photocatalysis Techniques
- Dielectric materials and actuators
- Magnesium Oxide Properties and Applications
- Ga2O3 and related materials
- Plasma Diagnostics and Applications
- Carbon Nanotubes in Composites
- Conducting polymers and applications
- 2D Materials and Applications
University of Tartu
2016-2025
Czech Academy of Sciences, Institute of Physics
2015-2023
Low-power gas sensors that can be used in IoT (Internet of Things) systems, consumer devices, and point-of-care devices will enable new applications environmental monitoring health protection. We fabricated a monolithic chemiresistive sensor by integrating micro-lightplate with 2D sensing material composed single-layer graphene monolayer-thick TiO2. Applying ultraviolet (380 nm) light quantum energy above the TiO2 bandgap effectively enhanced responses. Low (<1 μW optical) power operation...
As an atomically thin electric conductor with a low density of highly mobile charge carriers, graphene is suitable transducer for molecular adsorption. In this study, we demonstrate that the adsorption properties can be significantly enhanced laser-deposited TiO2 nanolayer on top single-layer CVD graphene, whereas effective transfer between TiO2-adsorbed gas molecules and retained through interface. The formation such heterostructure optimally monolayer thick oxide combined ultraviolet...
Abstract We report room-temperature ferromagnetism in Ca and Mg stabilized zirconia bulk samples thin films. Powders were prepared by the citrate-combustion route, films grown on silicon substrates pulsed laser deposition technique. X-ray diffractograms Raman spectra at room temperature reveal formation of cubic phase zirconia. The observed is robust both as well film samples, although it weaker origin can be related to oxygen vacancies created due divalent (calcium magnesium) substitution...
Gadolinia doped ceria Ce0.9Gd0.1O2-δ (GDC) barrier layer was deposited onto YSZ electrolyte and Ni-YSZ|YSZ half-cell using pulsed laser deposition (PLD), magnetron sputtering (MS) or spray pyrolysis (SP) methods. The first set of GDC layers studied without additional sintering the second additionally sintered for 3 h at 1300°C. Sr mobility initiated by thermal treatment La0.6Sr0.4CoO3-δ cathode 950°C 1100°C systematically with prepared PLD, MS SP Concentration profiles Zr ion in GDC, Ce YSZ,...
Graphene in its pristine form has demonstrated a gas detection ability an inert carrier gas. For practical use ambient atmosphere, sensor properties should be enhanced with functionalisation by defects and dopants, or decoration nanophases of metals or/and metal oxides. Excellent behaviour was found for two types single layer graphenes: grown chemical vapour deposition (CVD) transferred onto oxidized silicon (Si/SiO₂/CVDG), the epitaxial graphene on SiC (SiC/EG). Both samples were...
This paper further discusses a concept of creating self-sensing ionic polymer–metal composite (IPMC) actuating device with patterned surface electrodes where the actuator and sensor elements are separated by grounded shielding electrode. Different patterning methods discussed compared in detail; presented experimental data give an understanding qualitative properties patterns created. Finally, electromechanical model is proposed validated.
ABSTRACT Transparent [90% transmittance at 550 nm a sheet resistance ( R s ) of 279 Ω sq −1 ] poly(3,4‐ethylenedioxythiophene) (PEDOT) films with electrical conductivities up to 1354 S cm are prepared using base‐inhibited vapor phase polymerization atmospheric pressure. The influence reaction conditions, such as temperature and growth time, on the film formation is investigated. A simple convenient two‐electrode method used for in situ measurement resistance, enabling investigate mechanism...
Graphene has been recognized as a promising gas sensing material. The response of graphene-based sensors can be radically improved by introducing defects in graphene using, e. g., metal or oxide nanoparticles. We have functionalised CVD grown, single layer applying pulsed laser deposition (PLD) V2O5 which resulted thin on with average thickness ~0.6 nm. According to Raman analysis, PLD process also induced graphene. Compared unmodified graphene, the obtained chemiresistive sensor showed...
Miniature and low-power gas sensing elements are urgently needed for a portable electronic nose, especially outdoor pollution monitoring. Hereby we prepared chemiresistive sensors based on wide-area graphene (grown by chemical vapor deposition) placed Si/Si3N4 substrates with interdigitated electrodes built-in microheaters. Graphene of each sensor was individually functionalized ultrathin oxide coating (CuO-MnO2, In2O3 or Sc2O3) pulsed laser deposition. Over the course 72 h, heated were...
Graphene as a single-atomic-layer material is fully exposed to environment and has therefore great potential for creating of sensitive gas sensors. However, in order realize this different polluting gases, graphene be functionalized - adsorption centers type with high affinity target gases have created at its surface. In present work, modification by small amounts laser ablated materials introduced purpose versatile precise tool. The approach was demonstrated two very chosen pulsed...
A novel dual chamber (DC) measurement cell has been implemented for simultaneous monitoring of crystallographic and electrochemical (EC) properties Ni-Ce0.9Gd0.1O2−δ (Ni-GDC) solid oxide fuel (SOFC) anode at different polarizations. The influence system parameters (temperature, oxygen partial pressure in compartment ion flux through the electrolyte membrane from cathode to anode) on structure GDC redox performance Ni studied. leads increase layers close electrolyte. Increase decrease unit...
Some nanocrystalline TiO2 materials are notorious for their photoluminescence (PL), which exhibits a pronounced sensitivity to ambient oxygen and has potential optical gas sensing. Here, we utilized pulsed laser deposition obtain thin (70 nm) anatase films containing 1–2 atom % of either samarium (Sm) or neodymium (Nd) impurity ions. The highly porous nanostructure consisted quite regular, interconnected nanopillars with wall thickness 15–20 nm, fully exposing the material environment. PL...
In this manuscript, we explore the sensor properties of epitaxially grown graphene on silicon carbide decorated with nanolayers CuO, Fe3O4, V2O5, or ZrO2. The devices were investigated in regard to their response towards NH3 as a typical reducing gas and CO, C6H6, CH2O, NO2 gases interest for air quality monitoring. Moreover, impact operating temperature, relative humidity, additional UV irradiation changes sensing environment have been explored properties. Finally, cross-laboratory study is...
The firing voltage (FV) of gas discharge in a test cell plasma display materials was investigated for standard protective layers MgO deposited by electron beam, and ternary BaY2O4 BaGa2O4 oxides grown pulsed laser deposition on the special dielectric coated glass substrates. determined FVs (160 V), (210 V) (257 lead to conclusion that replacement these is not expedient panels. Using results from luminescence spectroscopy, values energy gap Eg ≈ 6.2 5.8 eV were estimated BaGa2O4,...
Abstract A new p-type thin film material for gas sensing was prepared and investigated CO response. The films of CoW O 4 were fabricated by pulsed laser deposition (PLD) characterised XRD, XRR, XPS SEM. substrate temperature oxygen pressure in PLD chamber varied order to examine the relations between parameters, structure sensitivity. Conductometric response measured at 150–350 ∘ C found be highest relatively low temperatures, 200–250 depending on relative humidity or annealing time...
Rare earth oxycarbonates are potential candidate materials for constructing simple and low-cost chemiresistive sensors monitoring carbon dioxide (CO 2 ) gas in the living working environment personal comfort health reasons. Also, measurement of CO concentrations is needed many industrial processes. Specifically, sol-gel made nanoparticles Nd La have been studied previously as novel sensor materials. In this paper, pulsed laser deposition oxycarbonate (La O 3 thin films was structural...