- Ph.D. thesis “Formation and analysis of periodic structures in polymer materials” (2005), co‐author of 181 scientific... morePh.D. thesis “Formation and analysis of periodic structures in polymer materials” (2005), co‐author of 181 scientificpublications (h‐index 12). Scientific activities include micro‐ and nanorelief formaᬀtion technologies, physical formaᬀtion phenomena analysis and invesᬀtigaᬀtion of plasmonic nanocomposites and carbonaceous nanostructures: scanning probe microscopy (AFM, conducᬀtive, Kelvinprobe etc.), spectrophotometric measurements in UV‐vis and IR bands, film thickness and opᬀtical constants determinaᬀtion by laserellipsometry. In the recent years, work was related to the development and analysis of polymeric composites exhibiᬀting piezo effect as well as their applicaᬀtions for MEMS (micro‐resonators) components. Parᬀticipant of many Naᬀtional and internaᬀtional projects. As a project coordinator (from KTU sight) she was involved in the Joint lasers, new materials, electronics, nanotechnology, applied science and technology Naᬀtional complex programmeme projects funded by EU structural funds: “Materials, nano‐ and light technologies, and development of breakthrough infrastructure of higher educaᬀtion in these fields” (2010‐2015)edit
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ABSTRACT In the recent years fundamental research involving the nanodimensional materials has received enormous momentum for observing and understanding new types of plasmonic materials and their physical phenomena occurring in the... more
ABSTRACT In the recent years fundamental research involving the nanodimensional materials has received enormous momentum for observing and understanding new types of plasmonic materials and their physical phenomena occurring in the nanoscale. Mechanical and optical properties of these polymer based nanocomposite structures depend not only on type, dimensions and concentration of filler material, but also on a kind of polymer matrix used. By proper selection of polymer matrix and nanofillers, it is possible to engineer nanocomposite materials with certain favorable properties. One of the most striking features of nanocomposite materials is that they can expose unique optical properties that are not intrinsic to natural materials. In these researches, nanocomposite structures were formed using polymer (PMMA) as a matrix, and silver nanoparticles as fillers. By hot embossing procedure a diffraction grating was imprinted on formed layers. The effect of UV exposure time on nanocomposite structures morphology, optical (diffraction effectiveness, absorbance) and mechanical properties was investigated. Results were confirmed by UV-VIS spectrometer, Laser Diffractometer, PMT- 3 and AFM. Investigations proposed new nanocomposite structures as plasmonic materials with improved optical and mechanical properties, which may be applied for a number of technological applications: micro-electro-mechanical devices, optical devices, various plasmonic sensors, or even in DNA nanotechnology.
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ABSTRACT Chromium (Cr) thin films were deposited on float glass using electron beam (e-beam) physical vapor deposition and radio frequency (RF) magnetron sputtering techniques. Surface morphology of these Cr films was studied using atomic... more
ABSTRACT Chromium (Cr) thin films were deposited on float glass using electron beam (e-beam) physical vapor deposition and radio frequency (RF) magnetron sputtering techniques. Surface morphology of these Cr films was studied using atomic force microscopy (AFM). The e-beam deposited Cr films consisted of isolated surface mounds while in RF sputtered samples, these mounds combined to form larger islands. Lower surface adhesive properties were observed for e-beam deposited films, as determined from AFM force–distance curves, presumably due to the nanostructural differences. Similar amounts of adsorbed atmospheric carbonaceous contaminants and water vapor were detected on samples deposited using both methods with e-beam deposited samples having additional carbide species, as determined by X-ray photoelectron spectroscopy data. The dominant crystallographic plane in both e-beam deposited and RF sputtered Cr thin films was (110) of body-centered cubic Cr metal structure as determined from X-ray diffraction data. Weak (211) reflection was also observed in RF sputtered samples and was attributed to a different thin Cr film condensation and growth mechanism which resulted in nanostructural differences between films deposited using two different methods.
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In this study SiOx containing amorphous hydrogenated carbon (a-C:H/SiOx) and nitrogen-doped a-C:H/SiOx (a-C:H:N/SiOx) films were deposited on polyvinylpyrrolidone (PVP) templates of variable thickness using a Hall-type closed drift ion... more
In this study SiOx containing amorphous hydrogenated carbon (a-C:H/SiOx) and nitrogen-doped a-C:H/SiOx (a-C:H:N/SiOx) films were deposited on polyvinylpyrrolidone (PVP) templates of variable thickness using a Hall-type closed drift ion beam source with constant irradiation parameters. A detailed surface characterization was followed using atomic force microscopy (AFM) topography images, surface morphology parameters, height distribution histograms and bearing ratio curves with hybrid parameters. The AFM analysis directly showed that the a-C:H/SiOx/PVP and a-C:H:N/SiOx/PVP composite films represent different morphologies with characteristic surface textures. Surface adhesive properties were evaluated by measuring the force required to separate the AFM tip from the surface by means of AFM force-distance curves. The variance in adhesion force detected was lower for a-C:H/SiOx/PVP composite films due to lower structural homogeneity of the surfaces. Fourier transform infrared spectroscopy analysis was performed to study the blend behavior of PVP upon a-C:H/SiOx and a-C:H:N/SiOx direct ion beam deposition. It was determined that interfacial interactions of PVP with the direct ion beam induced changes in the carbonyl group of the PVP and are dependent on the carrier gas used for the synthesis of the amorphous hydrogenated carbon films.
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Bibliogr.: p. 268 (8 pavad.)Vytauto Didžiojo universitetasŽemės ūkio akademij
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ABSTRACT Abstract Graphene oxide (GO) has been recognized as an important intermediate compound for a potential low-cost large-scale graphene-like film fabrication. In this work, graphene oxide multilayer films deposited on glass... more
ABSTRACT Abstract Graphene oxide (GO) has been recognized as an important intermediate compound for a potential low-cost large-scale graphene-like film fabrication. In this work, graphene oxide multilayer films deposited on glass substrate were reduced using different thermal reduction methods, including low-temperature annealing, flame-induced and laser reduction, and the corresponding surface morphology and structural properties were investigated. These graphene oxide thermal reduction methods strongly affected surface morphology and differently facilitated structural and chemical transformations of graphene oxide. As evidenced by Raman measurements, thermal annealing and laser reduction of graphene oxide produced more ordered graphene-like structure multilayer films. However, surface morphological differences were observed and attributed to the different de-oxidation mechanisms of GO. This Letter provides an important systematic comparison between the GO reduction methods and thermally-driven structural changes they provide to the reduced GO multilayer films obtained.
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Research Interests: Materials Engineering, Condensed Matter Physics, Materials Science, Evaporation, Atomic Force Microscopy, and 15 moreCompositional Analysis, Surface Coatings, Thin Film, Diffraction, Structural Change, Composite Structure, Surface and Coatings Technology, Glass Transition Temperature, X ray diffraction, Particle Size, Residual Stress, X Ray Photoelectron Spectroscopy, Poly (Ethylene Terephthalate), Electron Beam, and Crystallite
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In the present research, graphene was synthesized directly on a Si(100) substrate via combining direct microwave plasma-enhanced chemical vapor deposition and protective enclosure.
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This paper presents the investigation of surface morphology, wetting and chemical properties of the nanocomposite Al/SiO2 film, which can be used as a shock generated vibration isolator for microelectromechanical devices. AFM analysis... more
This paper presents the investigation of surface morphology, wetting and chemical properties of the nanocomposite Al/SiO2 film, which can be used as a shock generated vibration isolator for microelectromechanical devices. AFM analysis shows that two-step prepared Al/SiO2 composite film has regular nanoisland type surface topography provided by SiO2 nanospheres. EDS analysis confirms that SiO2 nanospheres are well distributed on the substrate. Carbon found in the composition of composite film can be attributed to the residuals of organic compounds used for the preparation of SiO2 nanospheres. FTIR analysis confirms formation of the Si-O and Si-OH functional groups and the presence of –CH3 stretching group can be related to the improved non-wetting behavior of the composite.
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The main aim of this paper is to create nanoporouse aluminium oxide membrane which could be used as vibroactive nanofilter in biomedical micro hydraulic devices. This research paper covers the experimental setup of nanoporouse aluminium... more
The main aim of this paper is to create nanoporouse aluminium oxide membrane which could be used as vibroactive nanofilter in biomedical micro hydraulic devices. This research paper covers the experimental setup of nanoporouse aluminium oxide membrane fabrication and the investigations of its chemical and surface properties. A custom-made anodization experimental setup was used to form membrane with hexagonal pores of 70 nm diameter and 110 nm interpore distance.
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With increasing technical requirements in the design of microresonators, the development of new techniques for lightweight, simple, and inexpensive components becomes relevant. Lead zirconate titanate (PZT) is a powerful tool in the... more
With increasing technical requirements in the design of microresonators, the development of new techniques for lightweight, simple, and inexpensive components becomes relevant. Lead zirconate titanate (PZT) is a powerful tool in the formation of these components, allowing a self-actuation or self-sensing capability. Different fabrication methods lead to the variation of the properties of the device itself. This research paper covers the fabrication of a novel PZT film and the investigations of its chemical, surface, and dynamic properties when film thickness is varied. A screen-printing technique was used for the formation of smooth films of 60 µm, 68 µm, and 25 µm thickness. A custom-made poling technique was applied to enhance the piezoelectric properties of the designed films. However, poling did not change any compositional or surface characteristics of the films; changes were only seen in the electrical ones. The results showed that a thinner poled PZT film having a chemical co...
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A novel cantilever type piezoelectric sensing element was developed. Cost-effective and simple fabrication design allows the use of this element for various applications in the areas of biomedicine, pharmacy, environmental analysis and... more
A novel cantilever type piezoelectric sensing element was developed. Cost-effective and simple fabrication design allows the use of this element for various applications in the areas of biomedicine, pharmacy, environmental analysis and biosensing. This paper proposes a novel piezoelectric composite material whose basic element is PZT and a sensing platform where this material was integrated. Results showed that a designed novel cantilever-type element is able to generate a voltage of up to 80 µV at 50 Hz frequency. To use this element for sensing purposes, a four micron periodical microstructure was imprinted. Silver nanoparticles were precipitated on the grating to increase the sensitivity of the designed element, i.e., Surface Plasmon Resonance (SPR) effect appears in the element. To tackle some issues (a lack of sensitivity, signal delays) the element must have certain electronic and optical properties. One possible solution, proposed in this paper, is a combination of piezoelect...
Research Interests: Engineering, Computer Science, Materials Science, Analytical Chemistry, Electronics, and 12 moreVibration, Atomic Force Microscopy, Medicine, Metal Nanoparticles, Sensors, Silver, Surface plasmon resonance, Cantilever, Piezoelectricity, Biocompatible Materials, Electrical And Electronic Engineering, and Biosensing Techniques
Evolution of physical properties and radiation-induced changes of the film composition and chemical bonding structure have been investigated in ion beam deposited and SiOx-containing DLC films after their exposure to high-energy X-ray... more
Evolution of physical properties and radiation-induced changes of the film composition and chemical bonding structure have been investigated in ion beam deposited and SiOx-containing DLC films after their exposure to high-energy X-ray photons generated in medical linear accelerator aiming the possible use of these films as protective coatings or passive layers in the construction of radiation detectors. Mechanical properties of the irradiated films were characterized by microhardness measurements and atomic force microscopy and were analyzed in parallel with the optical properties of the investigated samples. Chemical bonding structure of the DLC films was estimated by Raman spectroscopy (RS). Atomic composition of the films was evaluated from the X-ray photoelectron spectroscopy (XPS) measurements. Changes in surface morphology and increased hardness of the investigated samples as compared to the initial samples were observed. Comparing the results of investigation of SiOx-containing DLC films with those obtained for undoped hydrogenated DLC films, it was possible to figure out the relationship between radiation-induced structural changes and modification of the properties of different DLC films during irradiation by high-energy X-ray photons.
Research Interests: Physics, Materials Science, Raman Spectroscopy, PHOTOELECTRON SPECTROSCOPY, Atomic Force Microscopy, and 15 moreX Rays, Optical Properties, Surface Morphology, Structural Change, Radiation Effect, Medical Linear Accelerator, Irradiation, Ion Beam, Chemical Composition, X Ray Photoelectron Spectroscopy, Physical Properties, High energy, Radiation Detector Instrumentation, Mechanical Property, and radiation detector
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In this paper, plane-mirror Fabry-Perot resonators filled by photonic crystals, i.e., with periodic intracavity refraction index modulation is investigated experimentally and theoretically. In order to achieve the effect of 2D intracavity... more
In this paper, plane-mirror Fabry-Perot resonators filled by photonic crystals, i.e., with periodic intracavity refraction index modulation is investigated experimentally and theoretically. In order to achieve the effect of 2D intracavity index modulation the phase diffraction gratings were fabricated on the surfaces of the mirrors. The diffraction properties of such resonators can be manipulated, resulting in sub - and superdiffractive dynamics of light in the resonator, and in hyperbolic angular transmission profiles.
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Mesoporous TiO 2 films were prepared by template assisted sol-gel method and used as support for deposition of CdS particles on its surface to produce visible light sensitive nanocomposites. The influence of the surface morphology of... more
Mesoporous TiO 2 films were prepared by template assisted sol-gel method and used as support for deposition of CdS particles on its surface to produce visible light sensitive nanocomposites. The influence of the surface morphology of mesoporous titania matrix ...
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ABSTRACT Solvent cast thin films of blends polystyrene (PS) and poly (methylmethacrylate) (PMMA) with nominal compositions ranging from 25/75 wt.%/v% (w/v) up to 75/25 w/v PS/PMMA with toluene as the mutual solvent on crystalline Si (100)... more
ABSTRACT Solvent cast thin films of blends polystyrene (PS) and poly (methylmethacrylate) (PMMA) with nominal compositions ranging from 25/75 wt.%/v% (w/v) up to 75/25 w/v PS/PMMA with toluene as the mutual solvent on crystalline Si (100) and silica substrates has been studied. Films of PS and PMMA blends have been examined by atomic force microscopy (AFM) and ellipsometry. The blend films with less than 50% PMMA bulk concentration generally exhibit pitted surfaces; the pit size varies with film thickness and bulk composition. When the PMMA bulk concentration is greater than 50%, the film surface can be described as island-like phase-separated structure. The surface segregation and morphology are explained in terms of solubility of the two polymers in the solvent and rewetting of PMMA relative to PS.
Research Interests: Engineering, Chemical Engineering, Materials Science, Technology, Morphology, and 15 moreAtomic Force Microscopy, Thin Films, Sol Gel Process, Silica, Thin Film, Physical sciences, Nanostructures, Nanostructure, Refractive Index, Sorption, Solubility, Phase Separation, Surface Properties, Film Thickness, and Dip Coating
ABSTRACT Diamond like carbon (DLC) films received considerable interest due to outstanding mechanical and tribological properties as well as chemical inertness and hydrophobicity. That combination is particularly interesting for possible... more
ABSTRACT Diamond like carbon (DLC) films received considerable interest due to outstanding mechanical and tribological properties as well as chemical inertness and hydrophobicity. That combination is particularly interesting for possible application of the DLC as anti-sticking layers in novel lithographic techniques such as nanoimprint lithography, because Si, quartz and Ni – the most often used materials for imprint stamp formation – have high surface energy and, as a result, bad anti-adhesive properties. In present study, SiOx containing DLC thin films were synthesized from hexamethyldisiloxane vapor and hydrogen gas mixture by direct ion beam deposition. Anti-sticking properties of the grown DLC thin films were evaluated measuring surface contact angle with water. Chemical composition and structure of the deposited films were investigated by X-ray photoelectron spectroscopy and FTIR spectrometry. Morphology of the films was measured by atomic force microscopy. Effects of hexamethyldisiloxane flux on structure, anti-sticking properties and surface morphology of the SiOx containing DLC thin films were defined.
Research Interests: Engineering, Materials Science, Technology, Atomic Force Microscopy, Thin Film, and 11 morePhysical sciences, Diamond Like Carbon, Contact angle, Surface Morphology, Ion, Fourier transform infrared spectroscopy, Thin Solid Films, Ion Beam, Chemical Composition, Surface Energy, and X Ray Photoelectron Spectroscopy
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Vytauto Didžiojo universitetasŽemės ūkio akademij
Abstract: A novel cantilever type piezoelectric sensing element was developed. Cost-effective and simple fabrication design allows the use of this element for various applications in the areas of biomedicine, pharmacy, environmental... more
Abstract: A novel cantilever type piezoelectric sensing element was developed. Cost-effective and simple fabrication design allows the use of this element for various applications in the areas of biomedicine, pharmacy, environmental analysis and biosensing. This paper proposes a novel piezoelectric composite material whose basic element is PZT and a sensing platform where this material was integrated. Results showed that a designed novel cantilever-type element is able to generate a voltage of up to 80 µV at 50 Hz frequency. To use this element for sensing purposes, a four micron periodical microstructure was imprinted. Silver nanoparticles were precipitated on the grating to increase the sensitivity of the designed element, i.e., Surface Plasmon Resonance (SPR) effect appears in the element. To tackle some issues (a lack of sensitivity, signal delays) the element must have certain electronic and optical properties. One possible solution, proposed in this paper, is a combination of ...
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Nowadays a growing number of biosensing systems in microand nanoscale rely in expensive and bulky equipment that must capable acc ur tely to resolve the angle or wavelength of optical interrogation. The costs, size, sensitiv ity,... more
Nowadays a growing number of biosensing systems in microand nanoscale rely in expensive and bulky equipment that must capable acc ur tely to resolve the angle or wavelength of optical interrogation. The costs, size, sensitiv ity, properties and etc which are required to assemble these biosensing tools, may limit the port ability of such systems, and may restrict their usefulness in sensing applications outside of a con trolled environment. This research covers creation and investigations of new piezoelectric ma teri ls based on PVDF and PZT with unique properties, i.e. synthesis, piezoelectric thin film formation, imprint of microperiodic structures, analysis of surface morphology by Atomic Force Micr oscopy, and analysis of diffraction efficiencies using laser diffractometer. These deve lopments of new piezoelectric films have made it possible to understand the strengthening an d deformation mechanisms in microand nanoscales together by bringing new insights in bio sensing applicat...
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Microresonators are fundamental components integrated in hosts of MEMS applications: covering the automotive sector, the telecommunication industry, electronic equipment for surface/material characterization and motion sensing, and etc.... more
Microresonators are fundamental components integrated in hosts of MEMS applications: covering the automotive sector, the telecommunication industry, electronic equipment for surface/material characterization and motion sensing, and etc. The aim of this paper is to investigate the mechanical and electrical properties of PZT film fabricated with three binding materials: polyvinyl butyral (PVB), polymethyl methacrylate (PMMA) and polystyrene (PS) and to evaluate applicability in control of microresonators Q factor. Micro particles of PZT powder were mixed with 20% solution of PVB, PMMA and PS in benzyl alcohol. For investigation of mechanical and electrical properties multilayer cantilevers were made. Obtained PZT and polymer paste was screen printed on copper (thickness 40 μm) using polyester monofilament screen meshes (layer thickness 50 μm) and dried for 30 min at 100°C. Electric dipoles of the PZT particles in composite material were aligned using high voltage generator (5 kV) and a custom–made holder. Electric field was held for 30 min. Surfaces of the applied films were investigated by Atomic Force Microscope NanoWizard(R)3 NanoScience. Dynamic and electrical characteristics of the multilayer were investigated using laser triangular displacement sensor LK-G3000. The measured vibration amplitude and generated electrical potential was collected with USB oscilloscope PicoScope 3424. As the results showed, these cantilevers were able to transform mechanical strain energy into electric potential and, v.v. However, roughness of PZT coatings with PMMA and PS were higher, what could be the reason of the worse quality of the top electrode. However, the main advantage of the created composite piezoelectric material is the possibility to apply it on any uniform or non-uniform vibrating surface and to transform low frequency vibrations into electricity.
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TiO 2 and TiO 2/ZnO films with silver nanoparticles (Ag NP's) distributed in the matrix and on the surface were characterized by TEM, AFM and UV-Vis spectroscopy. Direct photoelectrochemical investigations of the TiO 2/Ag and TiO... more
TiO 2 and TiO 2/ZnO films with silver nanoparticles (Ag NP's) distributed in the matrix and on the surface were characterized by TEM, AFM and UV-Vis spectroscopy. Direct photoelectrochemical investigations of the TiO 2/Ag and TiO 2/ZnO/Ag heterojunctions ...
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A holographic beam splitter has been integrated into a picosecond four-wave mixing (FWM) scheme. This modification significantly simplified the procedure of dynamic grating recording, thus making the FWM technique an easy-to-use tool for... more
A holographic beam splitter has been integrated into a picosecond four-wave mixing (FWM) scheme. This modification significantly simplified the procedure of dynamic grating recording, thus making the FWM technique an easy-to-use tool for the holographic characterization of wide band gap materials. The novel FWM scheme was applied for characterization of hydride vapor phase epitaxy-grown undoped GaN layers of different thickness. It allowed the determination of carrier lifetime, diffusion coefficient, and carrier diffusion length by optical means, as well as the study of carrier recombination peculiarities with respect to dislocation and excess carrier density.
Research Interests: Engineering, Materials Science, Optics, Liquid Crystals, Modulation, and 15 moreMedicine, Optoelectronics, Nondestructive testing, Band Gap, Dislocations, CHEMICAL SCIENCES, Four Wave Mixing, Diffusion Coefficient, Optical Modulator, Ferroelectricity, Liquid Crystal, Grating, Amplitude Modulation, Amplitude, and Hydride vapor phase epitaxy
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This paper reviews recent investigations and achievements in the design of controllable functional components for improving microfluidic systems, its effectiveness, and functionality. The main purpose was to design novel microstructures... more
This paper reviews recent investigations and achievements in the design of controllable functional components for improving microfluidic systems, its effectiveness, and functionality. The main purpose was to design novel microstructures with piezoelectric properties (microresonators), which enable one to control the effectiveness of fluid flow in micro-hydro-mechanical devices for biomedical/biochemical purposes. Controllable properties were obtained by incorporating different types of binders in a piezoelectric ceramic matrix (lead zirconate titanate): polyvinyl butyral (PVB), poly methyl methacrylate (PMMA), and polystyrene (PS). The change in chemical composition of PZT helps to manipulate the piezoelectric characteristics, surface morphology, mechanical properties, etc., of the designed microfluidic element with the microstructure in it.
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The aim of this work is to produce and investigate silver polymer nanocomposites formed by electron beam evaporation on PMMA-PET structure. It is demonstrated that the surface plasmon resonance (SPR) absorption peak of nanostructured... more
The aim of this work is to produce and investigate silver polymer nanocomposites formed by electron beam evaporation on PMMA-PET structure. It is demonstrated that the surface plasmon resonance (SPR) absorption peak of nanostructured silver is near 425 nm and shifts to the longer waves (up to 600 nm) and corresponding band broadening with increase of silver film thickness. The different ultrathin silver-polymer nanocomposites color filters as a result of plasmon resonance shifting in the UV-VIS wavelength region were produced. The developed method provided a simple and practical solution to create silver nanostructures in polymer matrix. Keywords: polymethylmethacrylate (PMMA), polyethylene terephthalate (PET), silver, nanocomposites, plasmonic optic, AFM.
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ABSTRACT In the recent years fundamental research involving the nanodimensional materials has received enormous momentum for observing and understanding new types of plasmonic materials and their physical phenomena occurring in the... more
ABSTRACT In the recent years fundamental research involving the nanodimensional materials has received enormous momentum for observing and understanding new types of plasmonic materials and their physical phenomena occurring in the nanoscale. Mechanical and optical properties of these polymer based nanocomposite structures depend not only on type, dimensions and concentration of filler material, but also on a kind of polymer matrix used. By proper selection of polymer matrix and nanofillers, it is possible to engineer nanocomposite materials with certain favorable properties. One of the most striking features of nanocomposite materials is that they can expose unique optical properties that are not intrinsic to natural materials. In these researches, nanocomposite structures were formed using polymer (PMMA) as a matrix, and silver nanoparticles as fillers. By hot embossing procedure a diffraction grating was imprinted on formed layers. The effect of UV exposure time on nanocomposite structures morphology, optical (diffraction effectiveness, absorbance) and mechanical properties was investigated. Results were confirmed by UV-VIS spectrometer, Laser Diffractometer, PMT- 3 and AFM. Investigations proposed new nanocomposite structures as plasmonic materials with improved optical and mechanical properties, which may be applied for a number of technological applications: micro-electro-mechanical devices, optical devices, various plasmonic sensors, or even in DNA nanotechnology.
Research Interests: Plasmonics, Nanocomposites, Nanoparticles, Nanotechnology, Atomic Force Microscopy, and 15 moreDna Nanotechnology, DNA, Micro Electro Mechanical System, Diffraction, Optical Properties, Momentum, Diffraction Gratings, Silver Nanoparticle, Micro Optics, Absorbance, Matrices, Spectrometers, Diffraction Grating, Mechanical Property, and Physical Phenomena
The possibility to use water-born adhesive based on the copolymer of vinyl ester of synthetic saturated monocarboxylic acid, methylmethacrylate and 2-ethylhexylacrylate (VeoVa-10/MMA/2-EHA) modified with titanium dioxide, for the... more
The possibility to use water-born adhesive based on the copolymer of vinyl ester of synthetic saturated monocarboxylic acid, methylmethacrylate and 2-ethylhexylacrylate (VeoVa-10/MMA/2-EHA) modified with titanium dioxide, for the multilayer structures of hot stamping has been investigated. It is shown that for the unfilled adhesive compositions dilatant behaviour under shear flow condition is characteristic. The filling changes viscosity of dispersion and enables to facilitate technological adhesive layer coating procedures. The evaluation of adhesion properties by indirect method indicates changes of failure mode when adhesive layer thickness increases. The increase of unfilled adhesive layer thickness increases stamps covering irregularities and decreases its boundary zone quality. The optimal layer thickness was found to be 2 µm. The obtained results confirmed the effect of disperse filling as a way to change adhesion and mechanical properties of multilayer structure. The effecti...
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Silver nanoparticles have received considerable attention due to their attractive physical and chemical properties. The surface plasmon resonance and large effective scattering cross section of individual silver nanoparticles make them... more
Silver nanoparticles have received considerable attention due to their attractive physical and chemical properties. The surface plasmon resonance and large effective scattering cross section of individual silver nanoparticles make them ideal candidates for molecular labeling, where phenomena such as surface enhance Raman scattering (SERS) can be exploited. In addition, silver nanoparticles have recently been shown to be a promising antimicrobial material. In the present research silver colloid was produced by sodium citrate reduction. The colloidal silver was incorporated by dip-coating to the polymer substrate. X-Ray Fluorescence Spectroscopy (XRF), Atomic force microscopy (AFM), ultraviolet-visible spectroscopy (UV-VIS ) and SERS indicate that the produced structures include metallic crystalline silver nanoparticles. The surface plasmon resonance peak in absorption spectra of silver particles showed an absorption maximum at 420-500 nm. The silver - polymer nanocomposites structures with selective light properties as a result of plasmon resonance shifting in the UV-VIS wavelength region were produced.
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ABSTRACT Nanoparticles play an important role in scientific and technological fields, because they significantly affect the polymer matrix and lead to new properties. A combination of PMMA (poly-methylmethacrylate) with metal... more
ABSTRACT Nanoparticles play an important role in scientific and technological fields, because they significantly affect the polymer matrix and lead to new properties. A combination of PMMA (poly-methylmethacrylate) with metal nanoparticles can offer very wide application field in medicine, because metals may act on a broad range of microbial targets, and many mutations may occur for microorganisms to resist their antimicrobial activity. Usually metal and other nanoparticles are coated onto surfaces of substrates. Unfortunately, the durability of such nanocomposites normally is very poor, because coatings are quite sensitive to different damages. Therefore the main target of this research was to apply nanoparticles on the surface of PMMA substrate and to affect them with microwave heating that nanoparticles intervene into the polymer matrix and form permanent damage resistance metal nanolayer. It was determined that the application of the metal nanolayer on the PMMA and the partial insertion of nanoparticles into the polymer were successful. Although Cu nanoparticles mostly formed deep elements than Ag nanoparticles in the nanocomposites, they both molded grains on the surface of nanocomposites. The incorporation of metal nanoparticles into the PMMA allowed expanding the application field of nanocomposites with more durable metal nanolayers.
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SiOx doped diamond like carbon (DLC) film was applied as effective barrier for protecting microstructures against stiction during fabrication of surface micromachined electrostatically actuated microelectromechanical switch. Hydrophobic... more
SiOx doped diamond like carbon (DLC) film was applied as effective barrier for protecting microstructures against stiction during fabrication of surface micromachined electrostatically actuated microelectromechanical switch. Hydrophobic properties of the SiOx doped DLC film were determined using Zisman method (average critical surface tension 42.0 mN/m) and the average surface roughness was determined by atomic force microscope (Ra = 2.1 nm).