Aliaksei Dubavik

Aliaksei Dubavik
ITMO University | SPbNRU ITMO · Department of Photonics and Optical Information Technology

Dr. rer. nat.

About

91
Publications
6,049
Reads
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905
Citations
Introduction
Aliaksei Dubavik currently works at the Faculty of Photonics, ITMO University. Aliaksei does research in Physical Chemistry, Nanotechnology and Materials Chemistry.
Additional affiliations
April 2015 - present
ITMO University
Position
  • Senior Researcher
Description
  • ITMO Fellowship
January 2013 - March 2015
Technische Universität Dresden
Position
  • PostDoc Position
April 2011 - December 2012
Ludwig-Maximilians-University of Munich
Position
  • PostDoc Position

Publications

Publications (91)
Article
Photothermal therapy (PTT) has attracted increasing interest as a complementary method to be used alongside conventional therapies. Despite a great number of studies in this field, only a few have explored how temperatures affect the outcome of the PTT at nanoscale. In this work, we study the necrosis/apoptosis process of cancerous cells that occur...
Article
Multifunctional nanocomposites that combine both magnetic and photoluminescent (PL) properties provide significant advantages for nanomedical applications. In this work, a one-stage synthesis of magneto-luminescent nanocomposites (MLNC) with subsequent stabilization is proposed. Microwave synthesis of magnetic carbon dots (M-CDs) was carried out us...
Article
Full-text available
Magnetic-luminescent composites based on semiconductor quantum dots (QDs) and superparamagnetic iron oxide nanoparticles (SPIONs) can serve as a platform combining visualization and therapy. Here, we report the construction of QD-SPION nanocomposites based on synthesized SPIONs and alloyed QDs (CdxZn1−xSeyS1−y)/ZnS solubilized with L-cysteine molec...
Article
Water-soluble nanocomposites based on CdSe/ZnS quantum dots (QDs) and hydrophobic tetraphenylporphyrin (TPP) molecules passivated by chitosan (CS) have been formed. Magnetic circular dichroism (MCD) spectra evidence TPP presence in both monomeric and agglomerated forms in the nanocomposites. The nanocomposites demonstrate more pronounced singlet ox...
Article
Full-text available
Titania nanoparticle/CdSe quantum dot hybrid structures are a promising bactericidal coating that exhibits a pronounced effect against light-sensitive bacteria. Here, we report the results of a comprehensive study of the photophysical properties and bactericidal functionality of these hybrid structures on various bacterial strains. We found that ou...
Preprint
Water-soluble nanocomposites based on CdSe/ZnS quantum dots (QDs) and hydrophobic tetraphenylporphyrin (TPP) molecules passivated by chitosan (CS) have been formed. Magnetic circular dichroism (MCD) spectra evidence TPP presence in both monomeric and agglomerated forms in the nanocomposites. The nanocomposites demonstrate more pronounced singlet ox...
Article
Full-text available
The kinetics of photoluminescence of CuInS 2 /ZnS quantum dots at room temperature has been studied. We show that the parameters of the photoluminescence band of our quantum dots, i.e. its position and FWHM, do not depend on the delay time after the excitation laser pulse. These may suggest the spectral diffusion of photoluminescence of CuInS 2 /Zn...
Article
Different parameters are used when comparing SERS substrates in the research of most scientific groups. These parameters are more often aimed at comparing theory and experiment. We described experimental models for comparison and explain their applicability. In this work, a reaction mixture volume fixing technique was chosen when comparing differen...
Conference Paper
Full-text available
Magneto-luminescent nanosystems can be widely applied in biomedicine, namely for disease theranostics, early tumor imaging, and as drug delivery and hyperthermia agents. The creation of such systems using superparamagnetic iron oxide nanoparticles (SPIONs) and semiconductor quantum dots (QDs) approach is popular, since SPIONs are characterized by e...
Article
Full-text available
Carbon dots have been modified using UV irradiation (405 nm laser light). UV irradiation of carbon dots has led to various changes in optical properties, which in turn means photomodification of the carbon dots surface. With an increase in light transmission, we have obtained the increasing intensity of photoluminescence and a blue shift by the las...
Article
In this paper, we studied the properties of a multifunctional system, in which the luminescent and magnetic properties are combined. The calcium carbonate microspheres are used as porous matrices for complexes combining luminescence properties of AgInS2/ZnS quantum dots and magnetic properties of Fe3O4 nanoparticles. The study investigates the effe...
Article
Semiconductor transistor‐sensors are considered the most widely manufactured device in history. Being invented to switch electronic signals they revolutionized electronics. However, electric switches are hampered by damage from very brief electrical and thermal effects or electromagnetic interference. In article number 2000769, Alina Karabchevsky a...
Article
Full-text available
Heavy metal ions are not subject to biodegradation and could cause the environmental pollution of natural resources and water. Many of the heavy metals are highly toxic and dangerous to human health, even at a minimum amount. This work considered an optical method for detecting heavy metal ions using colloidal luminescent semiconductor quantum dots...
Article
Semiconductor transistors for sensors are considered the most widely manufactured device in history. Being invented to switch electronic signals they revolutionized electronics and paved the way for smaller and cheaper sensors, radios, calculators, and computers. However, electric switches are hampered by damage from very brief electrical and therm...
Article
Full-text available
Anisotropic quantum nanostructures have attracted a lot of attention due to their unique properties and a range of potential applications. Magnetic circular dichroism (MCD) spectra of semiconductor CdSe/ZnS Quantum Rods and CdSe/CdS Dot-in-Rods have been studied. Positions of four electronic transitions were determined by data fitting. MCD spectra...
Article
Full-text available
Hybrid nanomaterials based on graphene and PbS quantum dots (QDs) have demonstrated promising applications in optoelectronics. However, the formation of high-quality large-area hybrid films remains technologically challenging. Here, we demonstrate that ligand-assisted self-organization of covalently bonded PbS QDs and reduced graphene oxide (rGO) c...
Article
Full-text available
Carbon dots have attracted much attention due to the ease of synthetic methods and their stable photoluminescence with relatively high quantum yield. By the doping of carbon dot by heteroatoms the optical transitions can be tuned in a wide spectral range. In this work, the impact of heteroatoms on the optical properties of carbon dots has been inve...
Article
Full-text available
Titania nanoparticles (NPs) demonstrate the highest photocatalytic activity among metal oxides nanoparticles. A combination of Titania nanoparticles with brightly luminescent semiconductor quantum dots (QDs) makes it possible to obtain highly efficient photocatalytic systems activated by visible light due to photoinduced electron transfer. Multilay...
Article
Flat photonic materials such as thin films or metasurfaces form the basis of new optics and laser technology. However, their characteristics, for example, absorption and luminescence, are drastically limited in contrast to bulk materials. This problem can be overcome using plasmonic nanostructures. While the quantum dots absorption is enhanced by t...
Article
The research interest in the transition metal dichalcogenides (TMD) has been reborn a few years ago. This had happened due to the remarkable properties of monolayered TMD (e. g. high carrier mobility and high exciton binding energy) and due to the development of the exfoliation methods. Photoconductive MoS 2 -based devices spectral range can be exp...
Article
The effect of the Schottky barrier height changes on the metal/EDT-treated (1,2-ethanedithiol) PbS nanocrystals film interface is considered. Also, the influence of shunts on the J-V characteristic and the Schottky barrier height is demonstrated, as well, the effect of silver oxide layer on the charge accumulation and tunneling. It is shown that th...
Article
Full-text available
Here, we report an investigation of optical activity which was photochemically induced by illumination of QRs and DiRs with circularly polarized light; the photo-induced circular dichroism was quantitatively estimated, and it was shown that the photo-induced chemical reaction proceeds selectively, depending on the handedness of circularly polarized...
Article
The efficiency of the electron transfer in hybrid structures based on quantum dots of different architectures was studied. Electron transfer efficiency was estimated by two independent methods from the side of the electron donor (quantum dot) and acceptor (Titania nanoparticles). Structures based on core CdSe QDs with small diameter demonstrate the...
Article
Full-text available
Graphene-quantum dot nanocomposites attract significant attention for novel optoelectronic devices, such as ultrafast photodetectors and third-generation solar cells. Combining the remarkable optical properties of quantum dots (QDs) with the exceptional electrical properties of graphene derivatives opens a vast perspective for further growth in sol...
Article
Full-text available
A green and efficient strategy was developed for one-step synthesis of sulfur and nitrogen co-doped carbon dots using urea, thiourea and thioacetamide as nitrogen and sulfur source and citric acid as carbon source. The influence of nitrogen and/or sulfur doping of the carbon dots on their optical transitions is investigated. The as synthesized carb...
Article
Carbon dots (CDs) are luminescent nanomaterials, with a perspective of use in bioimaging and sensorics. Here, influence of the surrounding solvent media on the optical properties of CDs synthesized from the most commonly employed precursors, namely citric acid and ethylenediamine is investigated. The position of optical transitions of CDs can be tu...
Article
Full-text available
Over recent years, quantum dots (QDs) based on ternary metal dichalcogenides have attracted a lot of attention due to their unique properties and a range of potential applications. Here, we review the latest studies on the optical properties of AgInS2/ZnS QDs with emphasis on their theoretical modeling, and present our investigations of electronic...
Article
Full-text available
Iodide atomic surface passivation of lead chalcogenides has spawned a race in efficiency of quantum dot (QD)-based optoelectronic devices. Further development of QD applications requires a deeper understanding of the passivation mechanisms. In the first part of the current study, we compare optics and electrophysical properties of lead sulfide (PbS...
Article
Full-text available
Synthetic organic and inorganic carriers often meet limitations associated with problematic targeting ability or non-optimized pharmacokinetics, and therefore they have restricted therapeutic potential. Natural drug carriers (e.g. mesenchymal stem cells, MSCs) are able to natural recruitment towards tumor site and migrate through cancerous cells. T...
Article
The understanding of the physical mechanisms of the nanoobjects interaction within the nanostructured complex materials is one of the main tasks for the development of novel materials with tunable properties. In this work, we develop a formation procedure of the colloidal complexes based on alloyed CdZnSe/ZnS quantum dots and gold nanoparticles whe...
Article
Nanostructured luminescent materials based on perovskite nanocrystals are attractive since their optical properties can be tuned in a wide spectral range with high luminescence quantum yields and lifetimes. However, they lack stability. In this work, the optical properties of highly luminescent colloidal perovskite nanocrystals (CsPbX3, where X= Cl...
Conference Paper
Full-text available
In this work, we studied fluorescence (or Förster) resonance energy transfer between thiol- and cysteamine-capped green-emitting quantum dots (QDs) CdSe/ZnS (donor) and erythrosin B (acceptor) upon binding to bovine serum albumin in aqueous solution. Both steady-state and time-resolved fluorescent measurements revealed more effective resonance ener...
Article
Full-text available
Quantum dots (QDs) have been envisaged as very promising materials for the development of advanced optical sensors. Here we report a new highly porous luminescent material based on colloidal QDs for potential applications in optical sensing devices. Bulk flower-like porous structures with sizes of hundreds of microns have been produced by slow dest...
Article
The fast and accurate detection of disease-related biomarkers and potentially harmful analytes in different matrices is one of the main challenges in the life sciences. In order to achieve high signal-to-background ratios with frequently used photoluminescence techniques, luminescent reporters are required that are either excitable in the first dia...
Article
Ternary hybrid photovoltaics based on polymers, fullerenes, and colloidal semiconductor quantum dots (QDs) bring together high efficiency and technological flexibility. In order to increase the performance of such hybrid solar cells, thorough control over both film morphology and charge transport is required. In the present work, the morphology and...
Article
Colloidal ternary quantum dots of AgInS2 and AgInS2/ZnS were synthesized in water in the presence of mercapto alkyl carboxylic acid. Selective size separation of AIS and AIS/ZnS hydrophilic nanoparticles was performed as well as the ligand exchange by thiolated methoxypolyethylene glycol molecules having an amphiphilic nature. The influence of nano...
Article
Luminescent images of a few distinguishable alloyed semiconductor quantum dots obtained at room temperature using confocal scanning microscopy with spectral and temporal resolution demonstrate blinking of spatially distinguishable spots and local luminescence spectra varying within the ensemble.
Article
The interaction of semiconductor quantum dots CdZnSe/ZnS (QDs) and gold nanoparticles (Au NPs) in colloidal solutions was investigated. The replacement of ligands on the Au NP surface by mercaptocarboxylic acid molecules is shown to produce stable complexes of bound Au NPs and hydrophobic QDs with surface purified of organic ligands.
Article
The effect of temperature on luminescence of semiconductor nanocrystals is used for monitoring local heating of specimens studied at laser scanning microscope. The spectral position of luminescence maximum is a convenient parameter to be followed; its thermal shift remains nearly linear within a broad temperature range. Nanoplatelets are found adva...
Article
The techniques of preparation of layers of Cu2 – xSe semiconductor plasmonic nanocrystals (SPNC) with plasmonic resonances in near infrared region from toluene colloidal solution are described. It is shown that combining QDs with SPNC layers lead to the enhancement of optical response from the QDs. The PVA film makes it possible to optimize the QDs...
Article
Full-text available
Local fields of metal nanoparticles can change quantum dots (QDs) absorption and luminescence. In this work, we have investigated the interaction of granulated Ag NPs films with CdSe/ZnS semiconductor QDs in hybrid structure with a-C:H thin films. We have studied hybrid structure with two a-C:H films on a quartz substrate having wider optical gap o...
Article
We prepared thin films containing colloidal quantum dots CdSe/ZnS of four different mean core sizes, with photoluminescence maximum in the range 530–610 nm, and covered by different ligands, on the surface of water by the Langmuir method. We obtained Surface pressure–Area curves (π–A isotherms) of the formed films at room temperature under differen...
Article
Semiconductor plasmonic nanocrystals (PNCs) are a novel class of materials for near-infrared (NIR) plasmonics possessing strong and tunable localized surface plasmon resonances (LSPRs). In this work, we used PNCs to fabricate an active substrate for the enhancement of optical responses from near-infrared emitters: a thin film of PNCs in poly(vinyl...
Article
Understanding of different processes in the modern multicomponent metamaterials is a crucial task for their development. This includes the investigation of superstructures that can be formed by the nanoparticles self-assembly. Here we present a destabilization-based synthetic protocol for the preparation of porous superstructures with flower, spher...
Article
The interaction of gold nanoparticles (NPs) and semiconductor alloyed CdZnSe/ZnS quantum dots (QDs) in colloidal solutions is studied. It is shown that the photoluminescence intensity of QDs in a mixture decreases compared to that in the initial QD solution, which is caused by resonance nonradiative energy transfer from QDs to Au NPs in spontaneous...
Article
Strong enhancement of near-infrared (NIR) emission of lead sulfide quantum dots (QDs) induced by Cu2−xSe semiconductor plasmonic nanocrystals (PNCs), both embedded into nanoporous silicate matrix is reported. The emission enhancement comes from resonant interaction of QD optical transition dipole with the near field of plasmons of semiconductor PNC...
Article
Full-text available
Abstract—Local fields of metal nanoparticles can change quantum dots (QDs) absorption and luminescence. In this work, we have investigated the interaction of granulated Ag NPs films with CdSe/ZnS semiconductor QDs in hybrid structure with a-C:H thin films. We have studied hybrid structure with two a-C:H films on a quartz substrate having wider opti...
Article
Full-text available
Microfluidic devices present the basis of modern life sciences and chemical information processing. To control the flow and to allow optical readout, a reliable sensor material that can be easily utilized for microfluidic systems is in demand. Here, we present a new optical readout system for pH sensing based on pH sensitive, photoluminescent gluta...