Here we present a novel approach to the synthesis of hybrid C-Au-Ag nanoparticles which were foun... more Here we present a novel approach to the synthesis of hybrid C-Au-Ag nanoparticles which were found to be 20 30 nm carbon nanospheres containing dispersed Au-Ag bimetallic nanoparticles (1-5 nm). It was also revealed that annealing of C-Au-Ag NPs at various temperatures in the 100-600 C temperature range allows for the variation of NPs’ morphology and composition. This makes possible tuning of the surface plasmon resonance characteristics that opens an efficient way of the NPs functional properties control, like for example Surface-Enhanced Raman Scattering (SERS). It was found that the obtained hybrid CAu-Ag NPs display pronounced SERS activity with the enhancment factor (EF) ca. 10.
Nanostructured Transparent Electrodes: A Self‐Ordered Nanostructured Transparent Electrode of High Structural Quality and Corresponding Functional Performance (Small 20/2021)
Surfaces functionalized with metal nanoparticles (NPs) are of great interest due to their wide po... more Surfaces functionalized with metal nanoparticles (NPs) are of great interest due to their wide potential applications in sensing, biomedicine, nanophotonics, etc. However, the precisely controllable decoration with plasmonic nanoparticles requires sophisticated techniques that are often multistep and complex. Here, we present a laser-induced deposition (LID) approach allowing for single-step surface decoration with NPs of controllable composition, morphology, and spatial distribution. The formation of Ag, Pt, and mixed Ag-Pt nanoparticles on a substrate surface was successfully demonstrated as a result of the LID process from commercially available precursors. The deposited nanoparticles were characterized with SEM, TEM, EDX, X-ray diffraction, and UV-VIS absorption spectroscopy, which confirmed the formation of crystalline nanoparticles of Pt (3–5 nm) and Ag (ca. 100 nm) with plasmonic properties. The advantageous features of the LID process allow us to demonstrate the spatially se...
Until recently, planar carbonaceous structures such as graphene did not show any birefringence un... more Until recently, planar carbonaceous structures such as graphene did not show any birefringence under normal incidence. In contrast, a recently reported novel orthorhombic carbonaceous structure with metal nanoparticle inclusions does show intrinsic birefringence, outperforming other natural orthorhombic crystalline materials. These flake-like structures self-assemble during a laser-induced growth process. In this article, we explore the potential of this novel material and the design freedom during production. We study in particular the dependence of the optical and geometrical properties of these hybrid carbon-metal flakes on the fabrication parameters. The influence of the laser irradiation time, concentration of the supramolecular complex in the solution, and an external electric field applied during the growth process are investigated. In all cases, the self-assembled metamaterial exhibits a strong linear birefringence in the visible spectral range, while the wavelength-dependen...
Photo-triggered release of biopharmaceutical drugs inside the cells is a challenging direction of... more Photo-triggered release of biopharmaceutical drugs inside the cells is a challenging direction of modern science, which requires obtaining new polymeric systems. The interpolyelectrolyte complexes (IPECs) of poly-l-lysine with heparin capable of encapsulation of genetic constructions—such as model oligonucleotide, siRNA, and pDNA—were obtained. Poly-l-lysine to heparin ratios were optimized to provide the appropriate release kinetics of genetic material from the polyplex. In order to impart the obtained IPEC with photosensitive properties, the linker was synthesized as based on 4-brommethyl-3-nitrobenzoic acid. The conditions and kinetics of photosensitive linker destruction were carefully studied. The colloid particles of IPEC were modified with Cy3 probe and their cellular internalization was investigated by flow cytometry method. The efficacy of photosensitive IPECs as siRNA and pDNA delivery system was evaluated.
Constructing of efficient dual activating ratiometric YVO4:Nd3+/Eu3+ nanothermometer: co-doping or mixture
Nanoscale
Development of new contactless thermal nanosensors based on ratiometric approach is of significan... more Development of new contactless thermal nanosensors based on ratiometric approach is of significant interest. To overcome intrinsic limitation of thermally-coupled levels, dual activation strategy was applied. Dual activation was performed...
The combination of oxide and heavier chalcogenide layers in thin film photovoltaics suffers limit... more The combination of oxide and heavier chalcogenide layers in thin film photovoltaics suffers limitations associated with oxygen incorporation and sulfur deficiency in the chalcogenide layer or with a chemical incompatibility which results in dewetting issues and defect states at the interface. Here, we establish atomic layer deposition (ALD) as a tool to overcome these limitations. ALD allows one to obtain highly pure Sb 2 S 3 light absorber layers, and we exploit this technique to generate an additional interfacial layer consisting of 1.5 nm ZnS. This ultrathin layer simultaneously resolves dewetting and passivates defect states at the interface. We demonstrate via transient absorption spectroscopy that interfacial electron recombination is one order of magnitude slower at the ZnS-engineered interface than hole recombination at the Sb 2 S 3 /P3HT interface. The comparison of solar cells with and without oxide incorporation in Sb 2 S 3 , with and without the ultrathin ZnS interlayer, and with systematically varied Sb 2 S 3 thickness provides a complete picture of the physical processes at work in the devices.
Nanoporous iridium electrodes are prepared and electrochemically investigated towards the water o... more Nanoporous iridium electrodes are prepared and electrochemically investigated towards the water oxidation (oxygen evolution) reaction. The preparation is based on 'anodic' aluminum oxide templates, which provide straight, cylindrical nanopores. Their walls are coated using atomic layer deposition (ALD) with a newly developed reaction which results in a metallic iridium layer. The ALD film growth is quantified by spectroscopic ellipsometry and X-ray reflectometry. The morphology and composition of the electrodes are characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. Their catalytic activity is quantified for various pore geometries by cyclic voltammetry, steady-state electrolysis, and electrochemical impedance spectroscopy. With an optimal pore length of L % 17-20 mm, we achieve current densities of J = 0.28 mA cm À2 at pH 5 and J = 2.4 mA cm À2 at pH 1. This platform is particularly competitive for achieving moderate current densities at very low overpotentials, that is, for a high degree of reversibility in energy storage.
Carbon-based and carbon-metal hybrid materials hold great potential for applications in optics an... more Carbon-based and carbon-metal hybrid materials hold great potential for applications in optics and electronics. Here, we discuss a novel material made of carbon and gold-silver nanoparticles, fabricated using a laser-induced self-assembly process. This self-assembled metamaterial manifests itself in the form of cuboids with lateral dimensions on the order of several micrometers and a height of tens to hundreds of nanometers. The carbon atoms are arranged following an orthorhombic unit cell, with alloy nanoparticles intercalated in the crystalline carbon matrix. We analyze the optical properties of this metamaterial experimentally using a microscopic Müller matrix measurement approach and reveal a high linear birefringence across the visible spectral range. Theoretical modelling based on local-field theory applied to the
For the oxidation of water to dioxygen, oxide-covered ruthenium metal is known as the most effici... more For the oxidation of water to dioxygen, oxide-covered ruthenium metal is known as the most efficient catalyst, however, with limited stability. Herein, we present a strategy for incorporating a Ru/C composite onto a novel nanoporous electrode surface with low noble metal loading and improved stability. The Ru/C is coated on the pore walls of anodic alumina templates in a one-step laser-induced deposition method from Ru3(CO)12 solutions. Scanning electron microscopy proves the presence of a continuous Ru/C layer along the inner pore walls. The amorphous material consists of metallic Ru incorporated in a carbonaceous C matrix as shown by X-ray diffraction combined with Raman and X-ray photoelectron spectroscopies. These porous electrodes reveal enhanced stability during water oxidation as compared to planar samples at pH 4. Finally, their electrocatalytic performance depends on the geometric parameters and is optimized with 13 μm pore length, which yields 2.6 mA cm−2, or 49 A g−1, at ...
Nanoporous iridium electrodes are prepared and electrochemically investigated towards the water o... more Nanoporous iridium electrodes are prepared and electrochemically investigated towards the water oxidation (oxygen evolution) reaction. The preparation is based on 'anodic' aluminum oxide templates, which provide straight, cylindrical nanopores. Their walls are coated using atomic layer deposition (ALD) with a newly developed reaction which results in a metallic iridium layer. The ALD film growth is quantified by spectroscopic ellipsometry and X-ray reflectometry. The morphology and composition of the electrodes are characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. Their catalytic activity is quantified for various pore geometries by cyclic voltammetry, steady-state electrolysis, and electrochemical impedance spectroscopy. With an optimal pore length of ≈17-20 μm, we achieve current densities of =0.28 mA cm at pH 5 and =2.4 mA cm at pH 1. This platform is particularly competitive for achieving moderate current densitie...
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Papers by Alina Manshina