A5035498550- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Transition Metal Oxide Nanomaterials
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Ga2O3 and related materials
- Analytical Chemistry and Sensors
- Thin-Film Transistor Technologies
- Ion-surface interactions and analysis
- Advanced Chemical Sensor Technologies
- Semiconductor materials and devices
- Copper-based nanomaterials and applications
- Silicon Nanostructures and Photoluminescence
- Silicon and Solar Cell Technologies
- Optical Coatings and Gratings
- Acoustic Wave Resonator Technologies
- Photonic and Optical Devices
- Perovskite Materials and Applications
- Semiconductor Quantum Structures and Devices
- Integrated Circuits and Semiconductor Failure Analysis
- Semiconductor Lasers and Optical Devices
- Metal and Thin Film Mechanics
- Semiconductor materials and interfaces
- Photorefractive and Nonlinear Optics
- Surface Roughness and Optical Measurements
Foundation for Research and Technology Hellas
2015-2024
FORTH Institute of Electronic Structure and Laser
2015-2024
University of Crete
2013-2023
Technical University of Crete
2019
Public Power Corporation (Greece)
2019
National and Kapodistrian University of Athens
2019
University Hospital of Heraklion
2016
University of Southampton
2002-2005
FORTH Institute of Computer Science
1996-2004
Science and Technology Park of Crete
1999
Photocatalysis with modified titania is a promising approach to improve both air and health quality. Modified novel photocatalytic properties under indoor light irradiation leads smart coatings, which are benchmark materials suitable for their applications. It generally accepted that the activity affected by absorption, charge creation/recombination rate surface reactivity. In this contribution we focus on TiO2 as catalyst in heterogeneous photo-catalytic processes address efficiency of...
This work presents a study of intrinsic zinc oxide thin film as ozone sensor based on the ultraviolet (UV) photoreduction and subsequent re oxidation fully reversible process performed at room temperature. The films analyzed were produced by spray pyrolysis, dc rf magnetron sputtering. resistivity sputtering constituted nanocrystallites changes more than eight orders magnitude when exposed to an UV dose 4mW∕cm2. On other hand, porous textured pyrolysis low substrate temperature exhibit...
Hybrid lead halide spin coated perovskite films have been successfully tested as portable, flexible, operated at room temperature, self-powered, and ultrasensitive ozone sensing elements. The electrical resistance of the hybrid mixed (CH3NH3PbI3-xClx) element, was immediately decreased when exposed to an (O3) environment manage recover its pristine conductivity values within few seconds after complete removal gas. measurements showed different response times gas concentrations, good...
Abstract Surfaces which can accurately distinguish spatial and temporal changes in temperature are critical for not only flow sensors, microbolometers, process control, but also future applications like electronic skins soft robotics. Realizing such surfaces requires the deposition of thousands thermal sensors over large areas, a task ideally suited printing technologies. Negative coefficient (NTC) ceramics represent industry standard sensing due to their high excellent stability. A drawback...
Ordinary textiles are very often malodorous and the origin of cross-infection. Their microclimate, consisting moisture, contaminants, sweat, provides favorable conditions for microbial growth. Therefore, simple approaches surface modification using functional materials widely adopted to introduce antibacterial properties. This study reports a low cost technique that renders cotton fabrics antibacterial. Manganese (Mn)-doped photocatalytic titanium dioxide (TiO2) nanoparticles ∼150 nm average...
Herein, the physicochemical properties and enhanced adsorption capacity of highly porous thin-layer graphitic carbon nitride (g-C3N4) nanosheets (CNNs) in relation to separation dyes are investigated. Cationic anionic with similar sizes adopted study nitride. Highly g-C3N4 were synthesized via direct thermal polycondensation melamine followed by a exfoliation. A comparative bulk thin-film was carried out. The results revealed formation well-oriented structure adequate chemical stability....
We have developed a new microfabrication technique for the construction of three-dimensional photonic crystals. In particular, we used multiple tilted x-ray lithography exposures in order to construct structures with band gaps infrared region. First polymethylmethacrylate (PMMA) resist layers thickness 500 μm were irradiated, then holes structure filled preceramic polymer and subsequent pyrolysis converts into SiCN ceramic. Theoretical results fitted values dielectric constant are good...
The photocatalytic oxidation of gaseous benzene, toluene and xylene (BTX) over un-doped, 0.1 1 wt% Mn-TiO2 nanoparticles under ultraviolet visible irradiation was studied in atmosphere synthetic air or inert gas. decomposition efficiency the products were determined using a Static Photochemical Reactor coupled with FTIR spectroscopy. BTX underwent efficient photocatalysts UV irradiation, more oxygen presence less without oxygen. More important went substantial mol% presence. main final...
Indium oxide (InOx) films with a thickness of 10–1100 nm were deposited onto Corning 7059 glass and silica substrates at various substrate temperatures. An unusual decrease the lateral grain size increasing temperature during deposition was found. The changes in conductivity after exposure to ultraviolet light vacuum subsequent oxidation ozone atmosphere analyzed related their structural morphological properties. It is suggested that photoreduction treatments affect only thin layer less than...
Ligand-free all-inorganic lead halide nanocubes have been investigated as ozone sensing materials operating at room temperature. It is found that the nanocubes, crystallined in orthorhombic CsPbBr3 structure, can operate temperature, be self-powered and exhibit high sensitivity remarkable repeatability. More importantly, they demonstrate higher (54% 187 ppb) faster response recovery times compared to hybrid mixed perovskite (CH3NH3PbI3-x Cl x ) layers, which only material tested for sensing,...
Photocatalytic materials for degradation of organics and dyes, antibacterial action, fuel generation through water splitting carbon dioxide reduction.
Schematic diagram showing the 2D TOF SIMS overlays of Si<sup>+</sup>, Mn<sup>+</sup>and Zn<sup>+</sup>. The insert corresponds to correlation between sensing response and FMR signal as a function Mn concentration when exposed various gases.
Several parameters, including specific surface area, morphology, crystal size, and dopant concentration, play a significant role in improving the photocatalytic performance of ZnO. However, it is still unclear which these parameters enhancing activity. Herein, undoped Mn-, Co-, Cu-doped platelet-like zinc oxide (ZnO) nanostructures were synthesized via facile microwave synthetic route, their ultraviolet (UV) visible-light-induced activities, by monitoring gaseous acetaldehyde (CH3CHO)...
Single layers of MgF2 and LaF3 were deposited upon superpolished fused-silica CaF2 substrates by ion-beam sputtering (IBS) as well boat electron beam (e-beam) evaporation characterized a variety complementary analytical techniques. Besides undergoing photometric ellipsometric inspection, the samples investigated at 193 633 nm an optical scatter measurement facility. The structural properties assessed with atomic-force microscopy, x-ray diffraction, TEM techniques that involved conventional...