Персона: Набиев, Игорь Руфаилович
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Инженерно-физический институт биомедицины
Цель ИФИБ и стратегия развития – это подготовка высококвалифицированных кадров на базе передовых исследований и разработок новых перспективных методов и материалов в области инженерно-физической биомедицины. Занятие лидерских позиций в биомедицинских технологиях XXI века и внедрение их в образовательный процесс, что отвечает решению практикоориентированной задачи мирового уровня – диагностике и терапии на клеточном уровне социально-значимых заболеваний человека.
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Набиев
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Игорь Руфаилович
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109 results
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- ПубликацияТолько метаданныеQuantum dot-based plasmon-exciton emitters with improved one- And two-photon emission properties(2021) Rakovich, Y.; Krivenkov, V.; Samokhvalov, P.; Nabiev, I.; Самохвалов, Павел Сергеевич; Набиев, Игорь Руфаилович© 2021 SPIE.Photoluminescence (PL) properties of semiconductor quantum dots (QDs) may be significantly improved by forming hybrid structures with plasmonic nanoparticles (PNPs). In general, three main effects can be observed when QDs are placed near PNPs - a local enhancement of excitation, acceleration of radiative recombination rate (Purcell effect), and acceleration of nonradiative relaxation rate due to the metal-induced energy transfer. All these effects lead to an increase in PL quantum yield (QY), excitonic (EX) and biexcitonic (BX) states and to the strong reduction of PL lifetime. In this study, we investigated the EX and BX PL parameters of single QDs in the vicinity of PNPs at different overlapping between the excitation wavelength, QDs PL, and PNPs extinction spectra. Here, we have fabricated thin films of QDs separated from the environment by the polymer spacer, and placed PNPs atop of these structures under the continuous observation of optical parameter of the same single QD. We have found that the excitation may be strongly increased in the case of a strong spectral overlap between excitation band and PNPs extinction. Nevertheless, the EX QY is strongly reduced by the energy transfer. In the case of strong spectral overlap between QDs PL and PNPs extinction, the radiative rate is increased, which leads to an increase of both EX and BX QYs and to a near-unity BX-to-EX QY ratio. Finally, we managed to combine these two effects in one material with a synergistically increased PL intensity, ultrashort PL lifetime, and levelling of EX and BX QY.
- ПубликацияОткрытый доступDouble Rabi Splitting in a Strongly Coupled System of Core-Shell Au@Ag Nanorods and J-Aggregates of Multiple Fluorophores(2019) Melnikau, D.; Govyadinov, A. A.; Sanchez-Iglesias, A.; Grzelczak, M.; Nabiev, I. R.; Liz-Marzan, L. M.; Rakovich, Y. P.; Набиев, Игорь РуфаиловичCopyright © 2019 American Chemical Society.The interaction of several components in the strong coupling regime yielding multiple Rabi splittings opens up remarkable possibilities for studies of multimode hybridization and energy transfer, which is of considerable interest in both fundamental and applied science. Here we demonstrate that three different components, such as core-shell Au@Ag nanorods and J-aggregates of two different dyes, can be integrated into a single hybrid structure, which leads to strong collective exciton-plasmon coupling and double-mode Rabi splitting totaling 338 meV. We demonstrate strong coupling in these multicomponent plexitonic nanostructures by means of magnetic circular dichroism spectroscopy and demonstrate strong magneto-optical activity for the three hybridized states resulting from this coupling. The J-aggregates of two different nonmagnetic dyes interact with metal nanoparticles effectively, achieving magnetic properties due to the hybridization of electronic excitations in the three-component system. ©
- ПубликацияТолько метаданныеOptical properties of PBS-GO and PBS-RGO system for solar cells fabrication(2019) Babaev, A.; Dubavik, A.; Cherevkov, S.; Parfenov, P.; Nabiev, I.; Набиев, Игорь Руфаилович© NANOCON 2018 - Conference Proceedings, 10th Anniversary International Conference on Nanomaterials - Research and Application. All rights reserved. Quantum dots (QDs) are of great interest for creating optoelectronic devices due to their tunable bandgap, high stability and simple solution processability for device fabrication. One of the ways to increase the efficiency of such devices is to combine QDs with different carbon nanostructures. Lead sulfide PbS QDs with a ligand shell of oleic acid (OA), methylammonium iodide (MAI) and PbI2 were employed to study the process of charge transfer process between QDs and sheets of reduced graphene oxide (rGO) and graphene oxide (GO). QDs have been linked to graphene sheets by the (3-mercaptopropyl) trimethoxysilane in colloidal solution. As a result, we observed a change in intensity and kinetics of QDs PL, that allowed to estimate the efficiency of the charge transfer. The transfer efficiency for the QD-rGO system was found to be higher than that of the QD-GO system, ~ 80 % vs. 66 % respectively. Modification of the QDs surface with MAI and PbI2 allowed to achieve a charge transfer efficiency of up to 83 % and 89 %, respectively.
- ПубликацияОткрытый доступTwo-photon photoluminescence of a thin-film hybrid material based on CdSe(core)/ZnS/CdS/ZnS(multishell) semiconductor quantum dots(2019) Dyagileva, D. V.; Krivenkov, V. A.; Samokhvalov, P. S.; Nabiev, I.; Rakovich, Yu. P.; Самохвалов, Павел Сергеевич; Набиев, Игорь Руфаилович© Published under licence by IOP Publishing Ltd.Semiconductor quantum dots (QDs) are widely used as components of hybrid materials for development of efficient light emitters and convertors. Their unique nonlinear optical properties, such as two-photon absorption and two-photon photoluminescence from biexcitons, make them promising materials for photovoltaic and optoelectronic applications. In this study, thin-film hybrid materials based on the CdSe(core)/ZnS/CdS/ZnS(multishell) QDs have been fabricated, and the two-photon photoluminescence (PL) from the generated biexcitons have been studied. The results show that fabricated thin-film hybrid materials based on the QDs are efficient fluorophores in the one- and two-photon PL regimes for applications in optoelectronics and biosensing.
- ПубликацияТолько метаданныеAbsolute two-photon absorption cross-sections of single-exciton states in semiconductor nanocrystals(2020) Krivenkov, V.; Samokhvalov, P.; Dyagileva, D.; Nabiev, I.; Самохвалов, Павел Сергеевич; Набиев, Игорь Руфаилович© 2020 SPIE.Semiconductor nanocrystals (SNCs), in particular, quantum dots (QDs) and nanoplatelets (NPLs), have orders of magnitude higher two-photon absorption cross-sections (TPACS) than organic dyes, what paves the way to their advanced applications in bioimaging, sensing, and optoelectronics. Traditionally, z-scan and two-photon photoluminescence (PL) excitation spectroscopy are used to determine the TPACS values. The main disadvantage of both methods is the necessity to know the exact sample concentration. In this study, we describe an approach to the TPACS determination from the analysis of two-photon-excited (TPE) PL saturation in CdSe(core)/ZnS/CdS/ZnS(multishell) QDs and CdSe NPLs. The results obtained for NPLs using developed approach are significantly smaller than those obtained by the z-scan method and are close to the values obtained for QDs. We assume that this discrepancy occurs due to the fact, that unlike the z-scan technique, the TPE PL saturation method measures the TPACS only for single-exciton states because of the low PL quantum yields of multiexciton states. Therefore, there is no need to know the concentration, which eliminates the corresponding estimation error. Thus, the measurement of TPE PL saturation in SNCs makes it possible to determine the absolute values of the TPACS of single-exciton states, which are more informative for applications of TPE PL than the TPACS of mixed multiexciton states.
- ПубликацияТолько метаданныеFine Tuning Phosphonate Synthesis Yields of CsPbBr3 Perovskite Nanocrystals with Enhanced Stability for Applications in Quantum Technologies(2024) Samokhvalov, P. S.; Gusev, A. S.; Siglovaya, N. V.; Kargin, N. I.; Nabiev, I. R.; Самохвалов, Павел Сергеевич; Гусев, Александр Сергеевич; Сигловая, Наталия Владимировна; Каргин, Николай Иванович; Набиев, Игорь Руфаилович
- ПубликацияОткрытый доступBiosensors Based on Inorganic Composite Fluorescent Hydrogels(2023) Sokolov, P.; Samokhvalov, P.; Sukhanova, A.; Nabiev, I.; Соколов, Павел Михайлович; Самохвалов, Павел Сергеевич; Набиев, Игорь РуфаиловичFluorescent hydrogels are promising candidate materials for portable biosensors to be used in point-of-care diagnosis because (1) they have a greater capacity for binding organic molecules than immunochromatographic test systems, determined by the immobilization of affinity labels within the three-dimensional hydrogel structure; (2) fluorescent detection is more sensitive than the colorimetric detection of gold nanoparticles or stained latex microparticles; (3) the properties of the gel matrix can be finely tuned for better compatibility and detection of different analytes; and (4) hydrogel biosensors can be made to be reusable and suitable for studying dynamic processes in real time. Water-soluble fluorescent nanocrystals are widely used for in vitro and in vivo biological imaging due to their unique optical properties, and hydrogels based on these allow the preservation of these properties in bulk composite macrostructures. Here we review the techniques for obtaining analyte-sensitive fluorescent hydrogels based on nanocrystals, the main methods used for detecting the fluorescent signal changes, and the approaches to the formation of inorganic fluorescent hydrogels via sol–gel phase transition using surface ligands of the nanocrystals.
- ПубликацияТолько метаданныеLabel-Free Multiplexed Analysis Using Photonic Crystal-Based Biosensors(2022) Nifontova, G.; Nabiev, I.; Sukhanova, A.; Набиев, Игорь РуфаиловичAbstract Label-free bioanalytical methods have been widely employed in biomedical research, in particular, in drug screening and discovery, diagnostics, and proteomics. Photonic crystals (PCs) represent a modern alternative to surface plasmon resonance (SPR) techniques. Imaging of PC surface modes has been demonstrated as a promising label-free approach allowing for multiplexed detection. Surface modification of PC sensors is an important stage determining the effectiveness of the analysis of biomolecule interactions. Here, we describe the results of the development of a label-free PC-based sensor, the key steps of the modification and functionalization of the PC surface with proteins, as well as the evaluation of its suitability for sensing via 2D imaging of binding events. Our data demonstrate the efficiency of the designed PC-based sensor for analysis of proteins interactions and pave the way for the engineering of a label-free biosensing platform based on PCs.
- ПубликацияТолько метаданныеA nano-hybrid plasmon-exciton material with an enhanced biexciton emission increases the efficiency of the photodetector at high excitation intensities(2022) Rakovich, Y.; Krivenkov, V.; Samokhvalov, P.; Martynov, I. L.; Nabiev, I.; Самохвалов, Павел Сергеевич; Мартынов, Игорь Леонидович; Набиев, Игорь Руфаилович© 2022 SPIE.Semiconductor quantum dots (QDs) have a wide absorption spectrum spreading from UV to the visible region and high photoluminescence (PL) quantum yield (QY) what determine possible use of their films for re-emitting coatings enhancing the photodetector spectral range. Unlike fluorescent organic dyes, the QDs absorption doesn't saturate at high excitation intensities and can absorb more than one photon per particle due to the biexciton generation. However, due to the high rate of the Auger nonradiative relaxation, the QDs biexciton PL QY is much lower than the single-exciton one, what reduces the overall PL QY and the photodetector photosensitivity at the high excitation intensities. An employment of the Purcell effect in the plasmon nanocavities should increase the biexciton PL QY thus overcoming this limitation. To use this effect, we designed a thin-film plasmon-exciton material containing QDs and silver nanoplates (SNPs) in which the QDs' PL band and the SNPs' absorption band are overlapped. To demonstrate the advantage of the designed (QD-SNP)-film, we have compared effects of QD-film and (QD-SNP)-film on the photoresponse of the Si-based photodetector. The response of a photodetector to pulse excitation at 266 nm was negligible and increased after the deposition of the QD-film on its surface. However, at the high excitation intensities, the photosignal was reduced due to the biexcitons formation. The addition of SNPs increased the photoresponse at high excitation intensities. We attribute this improvement to a strong enhancement of QD biexciton PL in the QD-SNP material, which became predominate at high excitation intensities.
- ПубликацияОткрытый доступLabel-Free Multiplexed Microfluidic Analysis of Protein Interactions Based on Photonic Crystal Surface Mode Imaging(2023) Nifontova, G.; Petrova, I.; Gerasimovich, E.; Nabiev, I.; Герасимович, Евгения Семёновна; Набиев, Игорь РуфаиловичHigh-throughput protein assays are crucial for modern diagnostics, drug discovery, proteomics, and other fields of biology and medicine. It allows simultaneous detection of hundreds of analytes and miniaturization of both fabrication and analytical procedures. Photonic crystal surface mode (PC SM) imaging is an effective alternative to surface plasmon resonance (SPR) imaging used in conventional gold-coated, label-free biosensors. PC SM imaging is advantageous as a quick, label-free, and reproducible technique for multiplexed analysis of biomolecular interactions. PC SM sensors are characterized by a longer signal propagation at the cost of a lower spatial resolution, which makes them more sensitive than classical SPR imaging sensors. We describe an approach for designing label-free protein biosensing assays employing PC SM imaging in the microfluidic mode. Label-free, real-time detection of PC SM imaging biosensors using two-dimensional imaging of binding events has been designed to study arrays of model proteins (antibodies, immunoglobulin G-binding proteins, serum proteins, and DNA repair proteins) at 96 points prepared by automated spotting. The data prove feasibility of simultaneous PC SM imaging of multiple protein interactions. The results pave the way to further develop PC SM imaging as an advanced label-free microfluidic assay for the multiplexed detection of protein interactions.