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April 2016 - August 2016
Education
February 2025
September 2020 - July 2022
September 2016 - July 2020
Publications
Publications (32)
Carbon dots (CDs) are fluorescent carbon nanomaterials that are considered for applications in optoelectronics, sensorics, and biofields due to their low‐cost and robust synthesis, and versatile optical properties. Herein, it is demonstrated how chemical functionalization of hydrophilic or amphiphilic CDs with polyethylene glycol influences their e...
Today, the development of nanomaterials with sensing properties attracts much scientific interest because of the demand for low-cost nontoxic colloidal nanoprobes with high sensitivity and selectivity for various biomedical and environment-related applications. Carbon dots (CDs) are promising candidates for these applications as they demonstrate un...
Dissipation of the charge injected into the 0.5 × 0.5 µm² surface areas of [100] – oriented 500 nm-thick epitaxial NaNbO3 film was studied by Kelvin Probe Force Microscopy. The elliptical area of the electric potential spot dissipates during ∼4 ÷ 4.5 h via leakage through the film surface and substrate. At the final stage, a small negative surface...
In recent years, there has been rapid progress in the development of photonic devices based on lead halide perovskite nanocrystals since they possess a set of unique optical and charge transport properties. However, the main limiting factor for their subsequent application is poor stability against exposure to adverse environmental conditions. In t...
On-going development of carbon dots (CDs) for different applications calls for search of novel methods for their synthesis and surface functionalization. For fabrication of photonic devices, CDs should be soluble...
A post-synthetic modification strategy is presented to induce a chirality in red-emissive carbon dots (CDs) by covalent bonding with chiral isocyanates. The resulting chiral CDs exhibit circular dichroism signals in the 300–500 nm range with a dissymmetry factor of 8 × 10− 5 at 345 nm, distinct from their chiral precursors. These chiral CDs maintai...
Potassium niobate (KNbO₃, KN), potassium tantalate (KTaO₃, KT), and their solid solutions (KTN), presenting exceptionally high electro-optic properties (in certain compositions up to 300 times higher than that of conventional electro-optic material LiNbO₃ [1]), are considered as promising materials for nonlinear and electro-optical photonics, piezo...
Despite considerable advancements in the power conversion efficiency (PCE) of lead halide perovskite solar cells (PSCs), their operational durability remains a pivotal challenge for their widespread commercialization. One of the primary sources of instability of PSCs is the halide anion migration in the perovskite layer, causing a lack of stability...
Bioimaging probes based on carbon dots (CDs) can become a useful replacement for existing commercial probes, benefiting clinical diagnostics. While the development of dual-mode CD-based probes for magnetic resonance imaging (MRI), which provides the ability for photoluminescence (PL) detection at the same time, is ongoing, several challenges have t...
Subject of study . This study is focused on luminescent carbon dots derived from o-phenylenediamine and gadolinium chloride or nitrate hexahydrate. Aim of study. The study aims to fabricate long-wavelength photoluminescent gadolinium-doped carbon dots that could function as contrast agents for magnetic resonance imaging. Additionally, the study inv...
Subject of study . The spectral features of nanocrystals with ternary compositions I-V-VI 2 and I-III-VI 2 doped with the rare earth metal ytterbium are investigated and described. Purpose of the study. The aim of this work is to develop a novel synthesis method for these nanocrystals to further examine their optical and morphological properties. M...
In this work, copper-doped carbon nanoparticles with emission in a wide spectral range and the ability to change the relaxation times of water protons during magnetic resonance imaging were fabricated. A high relaxivity value r1 = 0.92 mM–1 s–1 was achieved, which is the highest value of r1 for copper nanoparticles, to our knowledge. The suggested...
Предмет исследования. Люминесцентные углеродные точки, полученные из о-фенилендиамина и гексагидрата хлорида или нитрата гадолиния. Цели работы. Создание углеродных точек с длинноволновой фотолюминесценцией, легированных гадолинием, обладающих свойствами контрастного вещества для магнитно-резонансной томографии. Исследование влияния типа используем...
Предмет исследования. В данной работе исследованы и описаны спектральные особенности нанокристаллов тройного состава I-V-VI2 и I-III-VI2, легированные редкоземельным металлом, иттербием. Цель работы. Создание нового метода синтеза нанокристаллов тройного состава для дальнейшего изучения их оптических и морфологических свойств. Метод. В результате а...
В настоящее время светодиоды представляют собой технологию, нашедшую широкое применение в различных отраслях техники и прочно укоренившуюся в повседневной жизни. Одним из самых используемых типов можно назвать светодиоды на основе органических красителей (OLED), применяемые в производстве
экранов, медицинских датчиков, голографии. Учитывая повсемес...
Представлены результаты исследований по синтезу углеродных точек из бензойной и лимонной кислот и их использованию в светодиодах. Определены оптимальные соотношения компонентов для получения углеродных точек, обладающих наилучшими свойствами. Углеродные точки были внедрены в структуру светодиодов в качестве светоизлучающего материала, максимальная...
Although chirality plays an important role in the natural world, it has also attracted much scientific attention in nanotechnology, in particular, spintronics and bioapplications. Chiral carbon dots (CDs) are promising nanoparticles for sensing and bioimaging since they are biocompatible, ecofriendly, and free from toxic elements. Herein, green and...
The formation of red-emissive optical centers in carbon dots based on citric acid and formamide was investigated by varying the synthesis parameters with focus on finding optimal─necessary and sufficient─amount of precursors to decrease byproduct amount and to increase the chemical yield of red-emissive carbon dots. The emission is observed at 640...
In this work, carbon nanoparticles (C-dots) were obtained from solution of chiral L-glutathione molecules in formamide. The resulting C-dots have photoluminescence (PL) in the red region of the spectrum at 370−470 nm and a high quantum yield for this band, reaching 10.8%. In the circular dichroism spectra of these C-dots, a signal in the optical tr...
On-going development of carbon dots (CDs) for different applications calls for search of novel methods for their synthesis and surface functionalization. For fabrication of light-emitting devices (LEDs), CDs should be soluble in non-polar solvents that are used for ink-printing of their functional layers, apart from the obvious requirement of brigh...
In the work Cu-doped carbon nanodots (CDs) with luminescence in the long-wavelength region were fabricated from citric acid, formamide and copper (II) chloride dihydrate. A high value of relaxivity r1 = 0.92 mM-1∙s-1 was obtained for Cu-CDs, which is the highest, to the best of our knowledge, for copper nanoparticles. The developed CDs are promisin...
Luminescent carbon nanodots (CDs) are a low-toxic nanomaterial with a tunable emission in a wide spectral range and with various functional groups on the surface. Therefore, CDs can prospectively serve as luminescent nanoprobes for biomedical applications, such as drug-delivery, visualization, sensing, etc. The doping of CDs with paramagnetic or tr...
Chemically synthesized carbon dots (CDs) have attracted a lot of attention as an eco-friendly and cost-efficient light-emitting material, and functionalization of CD surfaces with additives of different natures is a useful way to control their properties. In this study, we show how a post-synthetic treatment of CDs with citric acid, benzoic acid, u...
In this work, copper-doped carbon nanoparticles with emission in a wide spectral range and the ability to change the relaxation times of water protons during magnetic resonance imaging were fabricated. A high relaxivity value r1=0.92 mM-1·s-1 was achieved, which is the highest value of r1 for copper nanoparticles, to our knowledge. The suggested ca...
In this work, copper-doped carbon nanoparticles with emission in a wide spectral range and the ability to change the relaxation times of water protons during magnetic resonance imaging were fabricated. A high relaxivity value r1 = 0.92 mM-1∙s-1 was achieved, which is the highest value of r1 for copper nanoparticles, to our knowledge. The suggested...
Получены углеродные наночастицы (С-точки) из хиральных молекул L-глутатиона в формамиде. С-точки обладают фотолюминесценцией (ФЛ) в красной области спектра на 690 nm и высоким для данной полосы квантовым выходом, достигающим 10.8%. Кроме того, в спектрах кругового дихроизма С-точек наблюдается сигнал в области 370–470 nm, где находится оптический п...
In this work disposable pH sensors based on carbon dots synthesized from o-phenylenediamine. The dots were embedded into paper and cellulose strips, allowing pH estimation via UV-induced color changes, observable with a smartphone. Optical responses to pH and solvent polarity (ENT) were studied, with excitation at 450 nm showing the strongest sensi...
The optical characteristics of lead-free nanocrystals with a crystal structure of the double perovskite type with the chemical composition Cs2AgInCl6, doped with bismuth and coated with silicon dioxide were studied, and the possibility of their further application was shown. The optical properties of the nanocrystals under study are analyzed by abs...
Проведено исследование оптических характеристик бессвинцовых нанокристаллов с кристаллической структурой типа двойного перовскита с химическим составом Cs2AgInCl6, легированных висмутом и покрытых оболочкой из диоксида кремния, а также показана возможность их дальнейшего применения. Проведен анализ оптических свойств исследуемых нанокристаллов мето...
Mössbauer and magnetization studies of 0.5BiFeO₃-0.5ATiO₃ (A=Pb, Sr) solid solution compositions prepared using solid phase reactions route have been carried out. Temperature Tₙ of magnetic phase transition for 0.5BiFeO₃-0.5PbTiO₃ is about 150 K, while for 0.5BiFeO₃-0.5SrTiO₃ it is only ≈ 20 K. This dramatic difference in Tₙ values is ascribed to a...
The barium-strontium niobate thin films SrxBa1-xNb2O6 (SBN, 0< x< 1) are one of the most promising practically significant lead-free ferroelectric materials with good piezoelectric characteristics, for example, to create a ferroelectric RAM. The SBN lattice is of the tetragonal tungsten bronze (TTB) type and comparing to the cubic oxides with a per...
Sr x Ba 1-x Nb 2 O 6 (SBN), 0 < x < 1, применяются в сенсорах, акту-аторах, нелинейной оптике. В этом материале вектор спонтанной поляризации P s имеет одну компоненту, направленную вдоль оси с, а струк-тура принадлежит к типу тетрагональной воль-фрамовой бронзы (ТВБ). Важной особенностью SBN является нали-чие релаксорных свойств, природа которых п...
