A5007172509- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Catalytic Processes in Materials Science
- Gas Sensing Nanomaterials and Sensors
- Pigment Synthesis and Properties
- Transition Metal Oxide Nanomaterials
- Catalysis and Oxidation Reactions
- Anodic Oxide Films and Nanostructures
- Perovskite Materials and Applications
- Geophysics and Gravity Measurements
- Laser Design and Applications
- Material Properties and Failure Mechanisms
- Security, Politics, and Digital Transformation
- Chalcogenide Semiconductor Thin Films
- Spectroscopy and Laser Applications
- Crystallography and Radiation Phenomena
- Thermal and Kinetic Analysis
- Luminescence Properties of Advanced Materials
- Material Properties and Applications
- Historical and Political Studies
- Radiation Effects and Dosimetry
- Electric Power Systems and Control
- Solid-state spectroscopy and crystallography
- Physics of Superconductivity and Magnetism
- Nuclear Physics and Applications
St Petersburg University
2014-2023
Ulyanovsk State University
2020-2021
Saint Petersburg State University of Civil Aviation
2019
Institute of Physics
1985-2014
University of Pavia
2006-2007
Joint Institute for Nuclear Research
2004
All-Russian Research Institute for Optical and Physical Measurements
2003
Troitsk Institute for Innovation and Fusion Research
1999
Czech Academy of Sciences, Institute of Physics
1992-1993
All-Russian Research Institute of Relay Engineering
1991
A set of heat-induced and photoinduced absorption spectra various compositions Degussa P25 TiO2 different polymers has been examined. The are described as the sum overlapping bands (ABs) with maxima at 2.90 eV (427 nm, AB1), 2.55 (486 AB2), 2.05 (604 AB3); correlate entirely experimentally observed after reduction TiO2. Absorption visible-light-active photocatalysts reported recently in literature have also analyzed. Relatively narrow very similar independent method photocatalyst...
This article presents a systematic analysis of the absorption spectral features various titanium dioxide specimens, whether doped or undoped, in visible domain reported extensively literature; also it briefly examines origins such bands what have become known as visible-light-active TiO2 photocatalysts second-generation photocatalysts. We deduced that at energies hν less than 2.0 eV (λ > ∼600 nm) three occurring near-infrared and infrared regions originate from Tin+-related (n = 3, 2) color...
This article briefly reviews some factors that have impacted heterogeneous photocatalysis with next generation TiO 2 photocatalysts, along issues of current debate in the fundamental understanding science underpins field. Preparative methods and characteristics features N‐doped are presented described briefly. At variance experimental results interpretations X‐ray photoelectron spectra (XPS) regard to assignments N 1s binding energies systems. Relative pristine nominally clean absorption...
Water splitting occurring on a semiconductor photocatalyst has become the Holy Grail process to produce solar fuel, hydrogen, irradiation with sunlight (or simulated sunlight) in heterogeneous media. Authors often claim highly efficient evolution of hydrogen and oxygen from water through or presence some sacrificial electron donor, whether photocatalytically photoelectrochemically. Perusal scientific patent literature reveals that yields are disappointingly low even after decades remarkable...
The present article examines the photocoloration of TiO2/polymer compositions with various polymers and photobleaching color centers at selected irradiation wavelengths from UV region to near-infrared region. Photoactivation was examined by irradiating into absorption bands (ABs) maxima 2.90 eV (427 nm, AB1), 2.55 (486 AB2), 2.05 (604 AB3). Two principal types photostimulated absorbance changes were observed: (i) increases in (ii) decreases absorbance. latter is a direct experimental...
This Article reports on the thermo- and photo-stimulated effects optical properties of rutile titania ceramic layers fabricated in an air atmosphere by high-temperature calcination (technical grade) titanium substrates. The so-formed peeled off spontaneously during cooling phase back to ambient temperature reveal a yellow-colored upper surface cream-colored bottom that was contact with plate. two surfaces powdered specimen (formed from grinding peeled-off layers) were characterized X-ray...
The reduction of TiO2 nanoparticle through interaction with H atom and characterization resulting defect species O2 molecule adsorption were investigated by DFT calculations in a molecular cluster approach. isolated Ti8O16 was used as model. It found that between atomic hydrogen every oxygen has the following features: (1) formation stable OH group, (2) low activation energy process, (3) appearance reduced Ti3+ ion together one corresponding d-type singly occupied level cluster's "band gap"....
We herein report a real-time optical reflectance/absorption study of the photochromic behavior visible light absorbing (yellow) titania carried out using newly designed novel accessory for fluorescence spectrophotometer. Yellow rutile titania, thermochemically synthesized from technical grade titanium substrate, displays fully reversible sequence electronic processes controllable by photostimulated UV or light; three absorption bands appeared in range 2.16–1.52 eV that could be thermally...
This article reports the optical properties of visible–NIR light absorbing titania powders fabricated by thermochemical oxidation in air technically pure titanium (99T) and three alloys (Ti-4Al-2Mn, Ti-6Al-3Sn, Ti-7Al-2Mo-1Cr) that contained aluminum as major impurity (from 0.21 to 6.5 at. %) other metals indicated notations. The resulting specimens were characterized X-ray diffraction (XRD), photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy. samples obtained from are...
The vis–NIR-stimulated bleaching and thermostimulated of UV–vis-induced Ti3+ color centers in visible-light-active rutile titania were revisited to gain a fuller understanding the photoinduced formation separation charge carriers. prime photophysical process photostimulated is absorption light quanta by centers. However, as expected from photoexcitation ionization certain type centers, no selectivity could be ascertained. Moreover, thermoprogrammed annealing showed that photogenerated holes...
The present article reports novel opportunities of diffuse reflectance (DR) spectroscopy extended through the use a cryostat accessory for UV-vis-NIR spectrophotometers to investigate temperature dependences DR spectra at fundamental absorption edge semiconductors T = 90-600 K. Examined are rutile TiO2, photochromic TiO2 with strong in visible region, and halide double perovskite Cs2AgBiBr6 that exhibited two optical band-to-band transitions low-temperature spectra. Also reported spectral...
The goal of this Article is to elucidate the manifestation charge-transfer transitions in absorption spectra 1D perovskites based on a single six-membered ring molecule as "A"-site cation. temperature behavior spectral features pyridinium lead triiodide (PyPbI3) was examined range 100–300 K using variable UV–vis diffuse reflectance (DR) spectroscopy. At room temperature, absorption/DR spectrum displayed typical iodide perovskites: resonance at 3.13 eV and an edge 2.73 eV. Cooling sample...