Mindaugas Andrulevičius

Kaunas University of Technology · Institute of Materials Science

Herein we investigated hydrophilic surface modification of SiOx containing amorphous hydrogenated carbon nanocomposite films (DLC:SiOx) via the use of atmospheric oxygen plasma treatment. The modified films exhibited effective hydrophilic properties with complete surface wetting. More detailed water droplet contact angle (CA) measurements revealed...

Lead zirconate titanate (PZT) is a widely used material with applications ranging from piezoelectric sensors to developing non-volatile memory devices. Pb(ZrxTi1−x)O3 films were deposited by DC reactive magnetron sputtering at a temperature range of (500–600) °C. X-ray diffraction (XRD) indicated the perovskite phase formation in samples synthesize...

Chemical vapor deposition (CVD) is an attractive technique which allows graphene with simultaneous heteroatom doping to be synthesized. In most cases, graphene is grown on a catalyst, followed by the subsequent transfer process. The latter is responsible for the degradation of the carrier mobility and conductivity of graphene due to the presence of...

In the present research, the graphene was grown directly on the Si (100) substrate by a high-power impulse reactive magnetron sputtering the copper target. The samples' structure, morphology, and composition were investigated by Raman scattering spectroscopy, atomic force microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy. T...

In this research, the graphene was grown directly on the Si(100) surface at 600 °C temperature using an anode layer ion source. The sacrificial catalytic cobalt interlayer assisted hydrocarbon ion beam synthesis was applied. Overall, two synthesis process modifications with a single-step graphene growth at elevated temperature and two-step synthesi...

Thin tin selenide (SnSe) films were synthesized on polyamide sheets via the two-stage adsorption/diffusion method. The surface morphology and chemical composition of the hereby obtained thin film were characterized by energy-dispersive spectroscopy, field-emission scanning electron microscopy, X-ray diffraction, and X-ray photoemission spectroscopy...

The graphene was synthesized directly on the Si(100) substrate by an Inductively Coupled Plasma Beam Source without any catalyst. Plasma power, methane gas flow, hydrogen gas flow, temperature and time effects on graphene layers number and flake size, defects density, and surface morphology were studied. Prevailing defects type was considered. Boun...

The trilayer composite was fabricated by combining functional layers of fumed SiO2, thiol-ene, and poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT-PSS). Optical, scratch-healing, non-wetting, and electrical stability was investigated at different instances of time after thermal and solar irradiance treatment. The trilayer composite w...

In this paper, silver-doped zinc oxide nanoparticles were synthesized by using a solution combustion technique, in which zinc nitrate is used as an oxidizer and tartaric acid as a fuel. The phase composition, morphology and structural properties of the as-synthesized zinc oxide and silver-doped zinc oxide were established by using powdered X-ray di...

In this recent decade, great interest has risen to develop metal-free and cheap, biomass-derived electrocatalysts for oxygen reduction reaction (ORR). Herein, we report a facile strategy to synthesize an electrochemically active nanocarbon material from the renewable and biological resource, wood biomass. The ORR activity of the catalyst material w...

Low equilibrium solid solubility of Sn atoms in Ge (less than 1%) leads to limitations in application of this material for IR detectors and emitters. Providing of non-equilibrium conditions by powerful pulsed laser radiation can be successfully applied for enhancement of solubility of impurity atoms in the host material. Here we present laser-induc...

Titanium dioxide (TiO2) based photocatalysis has been among the most popular advanced oxidation processes in environmental applications in past several decades due to its low cost, nontoxicity, and relatively high oxidizing ability, although suffering from relatively low pollutant decomposition efficiency. Here we present a study on the enhancement...

In the present research both hydrogenated and hydrogen-free diamond like carbon (DLC) films containing different amounts of Al were deposited by magnetron sputtering. The composition, structure, morphology and optical properties of these films were explored. Aluminium carbide was found in hydrogen-free DLC:Al films. Formation of the AlOx or AlOx/Al...

Single-layered and multi-layered 20–60 nm thick silicon nitride (Si3N4) dielectric nanofilms were fabricated using a low-pressure chemical vapour deposition (LPCVD) method. The X-ray photoelectron spectroscopy (XPS) confirmed less oxygen content in the multi-layered nanofilms. The capacitors with Si3N4 multilayer demonstrated a tendency to a higher...

The qualified analysis of structure, morphology and defects in graphene is crucial for graphene layers evaluation and development of various electro-optical applications. In this work, we present the detailed analysis of properties of planar graphene and vertical graphene nanosheets (VGNs) prepared by means of microwave plasma enhanced chemical vap...

AuCeO2/C and Au/C catalysts were obtained by adsorption of AuNPs on the CeO2/C and pure carbon (C) substrates from an Au colloidal solution. It has been found that AuNPs of ca. 50 nm in size were adsorbed on the surfaces of CeO2/C and C; however, electrocatalytic activity of the investigated AuCeO2/C and Au/C catalysts was different. Ethylene glyco...

Herein, photothermal modification of nanocomposite films consisting of hydrated vanadium pentoxide (V2O5•nH2O) nanoribbons wrapped with graphene oxide (GO) flakes was performed via 405 nm direct laser irradiation. The combination of X-ray diffraction, X-ray photoelectron spectroscopy, Raman scattering, transmission electron microscopy and scanning...

The sequence of phase transformations during the crystallization of SrBaFeMoO6–δ by the solid-phase technique from a stoichiometric mixture of simple oxides SrCO3 + BaCO3 + 0.5Fe2O3 + MoO3 was studied. It has been established that the synthesis of barium – strontium ferromolybdate proceeds through a series of sequential - parallel stages. It was fo...

In the present research diamond-like carbon (DLC) films containing 4–29 at.% of silicon were deposited by reactive magnetron sputtering of carbon target. Study by X-ray photoelectron spectroscopy revealed the presence of Si–C bonds in the films. Nevertheless, a significant amount of Si–O–C and Si–Ox bonds was present too. The shape of the Raman sca...

In the present research, hydrogen-free diamond like carbon films with embedded copper nanoparticles (DLC:Cu) were grown by simultaneous DC magnetron sputtering of the graphite and copper targets. X-ray photoelectron spectroscopy was used to define the composition of the samples. Atomic force microscopy studies of diamond, like carbon films containi...

We have prepared a highly efficient and stable platinum–cobalt catalyst supported on graphene oxide by using a one-step synthesis microwave-irradiation process. The structure and composition of two different compositions (Pt:Co(2.5:1)/rGO, Pt:Co(2:1)/rGO) have been investigated by Fourier infrared spectroscopy (FT-IR), X-ray Photoelectron spectrosc...

The activation energy of oxygen diffusion in strontium ferromolybdate Sr2FeMoO6–δ is determined by the Merzhanov technique based on the temperature dependences of the oxygen desorption dynamics. The activation energy has a minimum value of 76.7 kJ mol−1 at δ = 0.005 and a maximum value of 156.3 kJ mol−1 at δ = 0.06. It is suggested that with an inc...

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is the most successful transparent conductive polymer widely used in functional organic devices. However, its potential in fabrication of highly conductive electrodes still has not been fully explored. This paper is an attempt to fill the existing gap of knowledge on possible post-...

A facile approach for preparation of gold nanoparticles decorated on reduced graphene oxide (AuNPs/rGO) in mild reaction conditions is described. Several microscopic and spectroscopic techniques (SEM, FTIR, XPS) have been connected with structural investigation (BET) in order to confirm the successful synthesis of AuNPs/rGO nanocomposites. The end...

In the present study cerium substitution effects in the sol-gel derived yttrium iron garnet (Ce:Y3Fe5O12, Ce:YIG) have been investigated. To avoid formation of CeO2 as side phase the samples were prepared under different conditions. Synthesis of Ce:YIG in the reducing atmosphere, however, showed the formation of perovskite YFeO3 as dominant phase....

In this work, gold nanoparticles decorated on reduced graphene oxide (Au/rGOs) samples were synthesized by employing the eco-friendly microwave-assisted process (MW). This rapid process has proven to be a viable and trustworthy new method for Au/rGOs preparation ensuring the simultaneous reduction of GO and obtaining of Au nanoparticles through a s...

Colloidal aluminum nanoparticles (Al NPs) can support surface plasmon resonances spanning ultraviolet to near-infrared wavelengths because of the high electron density of Al metal and the favorable position of its interband transitions. Free-standing colloidal Al particles can be synthesized using a variety of methods and suspended in solution, but...

In the present work diamond like carbon (DLC) films with embedded Cu nanoparticles were researched. The spectral characteristics of Cu nanoparticles, Cu-CuO and Cu-Cu2O nanoshells and nanocomposites on their base were studied including effects of size of nanoparticles. These studies included experimental research and theoretical simulations based o...

In the present study, carbon-derived material from pulping residues, such as black liquor, was doped with a cheap nitrogen precursor, dicyandiamide, and after that modified with cobalt nanoparticles using electroless metal plating. The morphology, structure and composition of the synthesised catalyst was characterised using TEM, XPS, Raman Spectros...

Amorphous carbon films containing oxygen and bismuth were deposited by direct current magnetron sputtering. The microstructure and optical properties of the films were measured as a function of magnetron sputtering power by atomic force microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, UV–VIS–NIR spectrophotometry, and null-ellipsom...

In the present study diamond like carbon films with embedded Cu nanoclusters (DLC:Cu films) were deposited by reactive high power impulse magnetron sputtering (HIPIMS). HIPIMS pulse length (pulse on time) effects were considered. The dependence of the chemical composition on pulse length was found. Structure of diamond like carbon matrix of the nan...

Nonlinear optical properties (self-saturable absorption and reverse-saturable absorption) of diamond-like carbon films with variable amounts of embedded copper nanoparticle (DLC:Cu) films deposited by high power pulse magnetron sputtering were studied in dependence on deposition conditions. X-ray photoelectron spectroscopy was used to study element...

A photopolymerizable thiol-ene composition was prepared as a mixture of pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) and 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (TTT), with 1 wt. % of 2,2-dimethoxy-2-phenylacetophenone (DMPA) photoinitiator. A systematic analytical analysis that investigated the crosslinked PETMP-TTT polymer...

https://doi.org/10.1016/j.arabjc.2018.12.009

Thick graphene oxide (GO) multilayer films were deposited on polyethylene terephthalate substrates. Photothermal reduction of thick GO multilayer films was performed via direct laser writing using a continuous wave 405 nm semiconductor laser. Direct laser writing speed and power density was varied in the range of 0.94–1.24 s/line and 1.69–2.71 × 10...

In the present study, wood-based carbon materials were investigated as catalysts for the electro-reduction of oxygen (ORR) and electro-oxidation of hydrogen (HOR) in an alkaline medium. Activated wood-based carbon and black liqueur were doped with cheap nitrogen precursor, dicyandiamide (DCDA) and were modified with cobalt nanoparticles. The doping...

Piezoresistive properties of hydrogenated diamond like carbon (DLC) and diamond like carbon based nickel nanocomposite (DLC:Ni) films were studied in the range of low concentration of nickel nanoparticles. The films were deposited by reactive high power pulsed magnetron sputtering of Ni target and some samples were deposited by direct current react...

The paper reports on the first successful fabrication of Co-graphene composites by electrochemical deposition of Co nanoparticles (NPs) on the sheets of twisted graphene. Characterization of the surface morphology and element mapping of twisted graphene decorated with Co NPs by transmission and scanning electron microscopy in combination with the e...

Recently, oblique angle deposition has been extensively used to form advanced optical coatings for high power lasers. In present work (article No. 201700764), a novel approach to form multilayer zero-order all-silica based waveplates is demonstrated. Study shows the superior optical performance of tested sample and capabilities to withstand high la...

Waveplates, used to modify polarization state of light, are integral part of high-power lasers. Classical approach to waveplate manufacturing is based on combination of birefringent crystalline materials and deposition of nonpolarizing antireflection (AR) coatings. Their limitation to withstand maximal peak power is determined by laser-induced dama...

Nowadays, 3D microoptical elements find a variety of applications from light emitting diodes and household appliances to precise medical endoscopes. Such elements, fabricated in a fused silica substrate by combining 3D e-beam patterning and dry etching, can be used as a mold for the high throughput replication in polymeric materials by UV nanoimpri...

Modified lithium orthosilicate (Li4SiO4) pebbles with additions of titanium dioxide (TiO2) are suggested as an alternative tritium breeding ceramic for the European solid breeder test blanket module. The noble metals – platinum (Pt), gold (Au) and rhodium (Rh), can be introduced into the modified Li4SiO4 pebbles during the melt-based process, due t...

We present Raman studies of graphene films grown on copper foil by atmospheric pressure CVD with n-decane as a precursor, a mixture of nitrogen and hydrogen as the carrier gas, under different hydrogen flow rates. A novel approach for the processing of the Raman spectroscopy data was employed. It was found that in particular cases, the various para...

The simplified approach for analysis of hidden image holograms is discussed in this paper. Diffraction efficiency and signal to noise ratio of reconstructed images were investigated using direct measurements technique and digitized image analysis employing “ImageJ” software. All holograms were recorded in a photoresist layer spin-coated on glass su...

In the present study diamond like carbon films containing copper nanoparticles were deposited by reactive magnetron sputtering. High power pulsed magnetron sputtering and direct current magnetron sputtering of copper in the acetylene and argon gas were used. Both unbalanced and balanced magnetron configurations were applied for the film deposition....

The effect of UV Nd:YAG laser intensity on the conductivity and optical properties of hydrothermal ZnO crystal was studied. Three laser intensities characterizing the change of optical, electrical and morphological properties of the crystal have been revealed. The first is improvement of the crystal quality up to I 1 ¼3.2 MW/cm 2. The second is at...

Polymeric carbon nitride (p-CN) was produced using a two-step thermal treatment process of urea without tailoring the reaction pressure and atmosphere. A systematic analytical analysis employing X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, Raman scattering and X-ray diffraction (XRD) was performed for structural and ch...

Abstract A systematic analysis of antibacterial activity of individual nanoderivatives, e.g. GO nanosheets, Ag and Cu nanoparticles (NPs), as well as combinations of Cu-Ag NPs, and GO-Cu-Ag nanocomposites against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Klebsiella pneumoniae and Methicillin-resistant Staphylococcus aureus (M...

The results of theoretical and experimental investigation of the optical absorption spectra of thin films of nanocomposite materials composed of silver nanoparticles embedded in a diamond like carbon (DLC) matrix are presented. The optical characteristics of DLC-Ag nanocomposite are considered within the framework of the effective medium approximat...

The survey of recently completed research concerning relation between the used technology of deposition (plasma enhanced chemical vapor deposition, magnetron sputtering), reagents, structure and piezoresistive properties of diamond like carbon (DLC) films containing different nanoparticles is presented. The effects of systematically varied depositi...

In this work we present a refractive index (RI) sensor based on a sub-wavelength holographic diffraction grating. The sensor chip was fabricated by dry etching of the finely spaced (d = 428 nm) diffraction grating in SiOx doped diamond like carbon (DLC) film. It is shown that employing a fabricated sensor chip, and using the proposed method of anal...

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...

In the present study Cr containing diamond-like carbon (DLC) films were deposited by radio frequency diode sputtering on polycrystalline alumina and monocrystalline silicon substrates. Piezoresistive properties and the thermal coefficient of resistance (TCR) were investigated. Structure and chemical composition of the synthesized films were studied...

After invention of holography by Dennis Gabor in 1947 it is widely used in various areas. The development of new holography methods made it suitable for new industrial and scientific applications: printing, security and authentication, sensors, data storage, particles analysis, etc. This review will focus mainly on the development of the optical ho...

In this work we present an optical refractive index sensor based on the Grating Light Reflection Spectroscopy (GLRS) method. The sensor consists of the finely spaced diffraction grating (sub micrometer region) that is in contact with the analyte (liquid or gas). Shining the polarized polychromatic light on the grating at the threshold angles of inc...

In this work we present an optical refractive index sensor based on the Grating Light Reflection Spectroscopy (GLRS) method. The sensor consists of the finely spaced diffraction grating (sub micrometer region) that is in contact with the analyte (liquid or gas). Shining the polarized polychromatic light on the grating at the threshold angles of inc...

In the present research we have evaluated residual stress as well as thermal stability of polytetrafluoroethylene (PTFE) and PTFE-based silver (Ag) nanocomposite films fabricated by dual magnetron sputtering. We used a RF magnetron system for sputtering PTFE, and a DC magnetron sputter source for metal. We have demonstrated that thin nanocomposite...

In this work system of the μ-fluidic devices of different depths was fabricated in fused quartz substrates employing standard contact optical lithography and plasma chemical etching in CF4/O2 feedstock gas mixture. To evaluate linear dimensions (depth and microrelief) of the fabricated structures we have employed monochromatic light diffraction eff...

The paper reports on the composition, morphology and optical properties of thin Mo–O–C–Se film electrodeposited onto SnO 2 –glass substrate (R = 292 Ω/cm 2). The composition of films was estimated based on X-ray photoelectron spectroscopy and Fourier transform infrared spectral analysis. Structural elements similar to molybdenum oxides and/or hydro...