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Search results for: thin diamond films
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Determination of buckling strength of silos composed of corrugated walls and thin-walled-columns using simplified wall segment models
PublicationW artykule przedstawiono wyniki obszernych analiz numerycznych wyboczenia i stateczności metalowych silosów z blachy falistej wzmocnionych cienkościennymi słupami. Wykonano analizy liniowe i nieliniowe. Do obliczeń zaproponowano proste modele segmentów ścian zamiast skomplikowanych modeli całych silosów. Otrzymano bardzo dobrą zgodność wyników numerycznych. Wyniki obliczeń numerycznych porównano dodatkowo z wynikami normowymi.
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Fluctuation enhanced gas sensing using UV irradiated Au-nanoparticle-decorated WO3-nanowire films
PublicationWO3 nanowires (WO3-NWs) decorated with gold nanoparticles (AuNPs) were utilized in resistive gas sensor devices to detect ethanol by use of fluctuation enhanced sensing (FES). The experimental system records both DC resistance and fluctuations of the sensing film. Our data verify that the sensitivity and selectivity of the gas sensor are improved by applying FES when the sensor is stimulated with a combination of UV light and heating....
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Temperature-dependent photoluminescence of polyazomethine films
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Fragrant films on the basis of potato starch
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Fragrant starch-based films with limonene
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Superconductivity of 80NbN-20SiO2 granular films
PublicationPraca przedstawia badania właściwości nadprzewodzących warstw 80%NbN-20%SiO2 (procent molowy) o różnej grubości otrzymanych metodą zol-żel. Przejście nadprzewodzące badanych warstw mierzone w polu magnetycznym jest szerokie, co wyjaśnione zostało termicznie aktywowanym płynięciem pola magnetycznego wnikającego do próbki. W wysokich polach zaobserwowano w badanych warstwach indukowane polem magnetycznym przejście nadprzewodnik -...
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Electroabsorption in vacuum-evaporated films of bathocuproine
PublicationW pracy zmierzono widma elektroabsorpcji (EA) dla próżniowo naparowanych warstw batokuproiny (BCP), stosowanej jako transporter elektronów i bloker dziur w organicznych diodach elektroluminescencyjnych. Widma EA zinterpretowano na podstawie teorii efektu Starka przez bezpośrednie porównanie z widmami I-szej i II-giej pochodnej współczynnika absorpcji. Wyznaczono zmiany trwałego momentu dipolowego i zmiany polaryzowalności elektronowej...
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The scanning electron microscopy (SEM) studies of heavy boron-doped diamond oxidation under high-temperature
Open Research DataThe dataset contains the results of scanning electron microscopy (SEM) images of heavy boron-doped diamond (BDD) electrodes subjected to high-temperature oxidation in a furnace at 600 Celsius. The micrographs reveal the material decomposition of BDD grains due to high temperature.
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Kinetics of the Organic Compounds and Ammonium Nitrogen Electrochemical Oxidation in Landfill Leachates at Boron-Doped Diamond Anodes
PublicationElectrochemical oxidation (EO) of organic compounds and ammonium in the complex matrix of landfill leachates (LLs) was investigated using three different boron-doped diamond electrodes produced on silicon substrate (BDD/Si)(levels of boron doping [B]/[C] = 500, 10,000, and 15,000 ppm—0.5 k; 10 k, and 15 k, respectively) during 8-h tests. The LLs were collected from an old landfill in the Pomerania region (Northern Poland) and were...
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Fluid–solid interaction on a thin platelet with high-velocity flow: vibration modelling and experiment
PublicationThe paper concerns the nonlinear behaviour of a thin platelet that is streamlined in an aerodynamic tunnel. The air velocity in the aerodynamic tunnel was at 858.9 km/h or 0.7 Ma (Ma—Mach number is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound). This experiment was numerically simulated using FSI (fluid–solid interaction) tools, namely the coupling...
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High - voltage thin - layer fuses
PublicationZaprezentowano nową technologię i konstrukcję bezpieczników wysokonapięciowych wykorzystując technologie stosowane w mikroelektronice. Cienką warstwę topika naniesiono na quasiceramiczne podłoże. Wykonane modele bezpieczników charakteryzują się wysoką pewnością działania oraz małymi stratami I2t.
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Influence of the fragment size on the recycling process of thin-film modules based on CdTe
PublicationFor several years, the production of second generation cells (the so-called thin film), produced from amorphous silicon, cadmium telluride (CdTe) or copper indium (gallium) diselenide (CI(G)S), has been increasing. The total number of end-of-life panels by 2050 is expected to reach 9.57 million tonnes. They contain heavy metals that can be leached into the environment at the land field. The EU directive on waste electrical and...
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Modelling of elastic wave propagation in a bolted joint using a thin layer of shell elements
PublicationThere are many mathematical models describing the propagation of elastic waves through the imperfect boundary of two media. They were successfully applied to modelling of high frequency bulk waves and their interaction with local defects. On the other hand, the existing literature models of bolted connections ignore the aspect of imperfect connection between elements. Therefore, this paper presents the concept of application of...
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Implementation of SiN thin film in fiber-optic sensor working in telecommunication range of wavelengths
PublicationMirrors are used in optical sensors and measurement setups. This creates a demand for mirrors made of new materials and having various properties tailored to specific applications. In this work, we propose silicon covered with a thin silicon nitride layer as a mirror for near-infrared measurements. SiN layer was deposited on a standard silicon wafer with a Low-Pressure Chemical Vapor Deposition furnace. Then, the created layer...
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Ultra-thin film of aluminum oxide influence on the plasmon resonance in gold nanostructures
Open Research DataUltra-thin film of aluminum oxide influence on the plasmon resonance in gold nanostructures was measured by UV-VIS spectroscopy. Ultra thin film of Al2O3 was deposited on a gold nanostructures. Thickness of film was 2nm - 8nm. Shift of plasmon resonance was observed, as a result of various dielectric constant of layer.
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Study on surface termination of boron-doped diamond electrodes under anodic polarization in H2SO4 by means of dynamic impedance technique
PublicationAnodic oxidation is a popular way to modify termination bonds at boron doped diamond electrodes altering their electrochemical and physicochemical properties. Our studies, performed with dynamic electrochemical impedance spectroscopy technique, supported with X-ray photoelectron spectroscopy and ellipsometry analysis prove its utility in continuous on-line monitoring of impedance changes on the electrode surface under polarization...
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Efficient removal of 2,4,6-trinitrotoluene (TNT) from industrial/military wastewater using anodic oxidation on boron-doped diamond electrodes
PublicationWith growing public concern about water quality particular focus should be placed on organic micropollutants, which are harmful to the environment and people. Hence, the objective of this research is to enhance the security and resilience of water resources by developing an efficient system for reclaiming industrial/military wastewater and protecting recipients from the toxic and cancerogenic explosive compound – 2,4,6-trinitrotoluene...
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Electrochemical detection of 4,4',5,5'-tetranitro-1H,1'H-2,2'-biimidazole on boron-doped diamond/graphene nanowall electrodes
PublicationWe present a promising approach to the electroanalytical detection of a specific nitroaromatic explosive in landfill leachates (LLs) that originated from a municipal solid waste plant. The paper is focused but not limited to the sensing of 4,4',5,5'-tetranitro-1H,1'H-2,2'-biimidazole (TNBI) using differential pulse voltammetry and cyclic voltammetry. Highly electroactive nanocarbon was applied to determine low concentrations of...
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Chemical and structural studies of screen-printed carbon electrodes (SPCE) with boron-doped diamond foils
Open Research DataThis dataset contains chemical analyses and structural studies by XPS and Raman spectroscopy, carried out for SPCE containing boron-doped diamond BDD foils done with scanning electron microscope. Different points for XPS analysis mark different electrode spots: A) working electrode, B) reference electrode, C) counter electrode, D) pads.
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Deformation of thin metal and composite sheets by using anti-buckling fixture for large deformation under tension–compression cyclic loading
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Electrochemical Stability of Few-Layered Phosphorene Flakes on Boron-Doped Diamond: A Wide Potential Range of Studies in Aqueous Solutions
PublicationTwo-dimensional phosphorene has attracted great interest since its discovery as a result of its extraordinary properties. Two-dimensional single crystals of phosphorene can be useful for electrochemical (EC) sensing applications due to their enhanced surface-to-volume ratio. We proposed to investigate the electrochemical performance of phosphorene deposited directly on boron-doped diamond (BDD) electrodes. Noncovalent interaction...
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Improving the Performance of a Graphite Foil/Polyaniline Electrode Material by a Thin PEDOT:PSS Layer for Application in Flexible, High Power Supercapacitors
PublicationIn this study, we present a novel strategy for enhancing polyaniline stability and thus obtaining an electrode material with practical application in supercapacitors. A promising (graphite foil/polyaniline/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) GF/PANI/PEDOT:PSS) electrode material was characterized and used in the construction of a symmetric supercapacitor that provides an outstanding high power density. For this...
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NUMERICAL SIMULATIONS OF HONING PROCESS OF THIN WALL CYLINDER LINERS, WITH CONSTANT AND WITH VARIABLE THICKNESS OF WALL OF HONED PARTS
PublicationNumerical simulations of honing process of thin-wall cylinder liners, with constant and with variable thickness of the wall of honed workpieces can improve and can help to conduct the experimental research of honing process and can improve the honing process. A very valuable research assumption, before performing the numerical analysis of computer simulation of honing process, is the measurement of the real geometry of the honing...
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Influence of Surface-Modified Montmorillonite Clays on the Properties of Elastomeric Thin Layer Nanocomposites
PublicationIn recent years, polyurethane nanocomposites have attracted more attention due to the massive demand for materials with increasingly exceptional mechanical, optical, electrical, and thermal properties. As nanofillers have a high surface area, the interaction between the nanofiller and the polymer matrix is an essential issue for these materials. The main aim of this study is to validate the impact of the montmorillonite nanofiller...
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Fish gelatin-nanoclay films. Part I: Effect of a kind of nanoclays and glycerol concentration on mechanical and water barrier properties of nanocomposites
PublicationThe aim of work was the improvement of the mechanical and water barrier properties of nanocomposites prepared from fish gelatin and nanoclays (5–15%), plasticized with glycerol at different concentrations. The effect of hydrophilic Cloisite Na1 and Nanomer®PGV was compared with that exerted by organically modified more hydrophobic Nanofil®2 and NanoBent ZR-1. Antimicrobial activity of nanocomposites containing hydrophobic nanoclays...
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Photoconduction and magnetic field effect on photoconduction in hole-transporting star-burst amine (m-MTDATA) films
PublicationPhotoconduction and magnetic field effect on photoconduction have been investigated as a function of electric field strength, excitation light intensity and wavelength in vacuum evaporated films of m-MTDATA (4,4′,4″-tris(N-(3-methylphenyl)-N-phenylylamino) triphenylamine), the starburst amine commonly used as hole-transporting material in organic light-emitting diodes. The photocurrent is found to be generated by the singlet exciton...
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Fiber optic microsphere with a ZnO thin film for potential application in a refractive index sensor – theoretical study
PublicationOptical fiber sensors of refractive index play an important role in analysis of biological and chemical samples. This work presents a theoretical investigation of spectral response of a fiber optic microsphere with a zinc oxide (ZnO) thin film deposited on the surface and evaluates the prospect of using such a structure for refractive index sensing. A microsphere is fabricated by an optical fiber tapering method on the base of...
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Igor Szpotakowski
PeoplePrincipal Investigator in the four-year project (2020-2024): “Services contracts in private law of the PRC - codification in the era of decodification” funded by the Polish Ministry of Science and Higher Education “Diamond Grant” programme, which is awarded to the most promising young researchers in Poland. Awarded a Ryoichi Sasakawa Young Leaders Fellowship to conduct one-year research (2020-2021) about “The effects of non-performance...
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Electrochemical determination of nitroaromatic explosives at boron-doped diamond/graphene nanowall electrodes: 2,4,6-trinitrotoluene and 2,4,6-trinitroanisole in liquid effluents
PublicationThe study is devoted to the electrochemical detection of trace explosives on boron-doped diamond/graphene nanowall electrodes (B:DGNW). The electrodes were fabricated in a one-step growth process using chemical vapour deposition without any additional modifications. The electrochemical investigations were focused on the determination of the important nitroaromatic explosive compounds, 2,4,6-trinitrotoluene (TNT) and 2,4,6-trinitroanisole...
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Preparation and characterization of biopolymeric films with magnetic properties
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Hydroxyapatite films as biocompatibile coating for artifical bone
PublicationW artykule została szczegółowo opisana budowa kości oraz materiał biokompatybilny hydroksyapatyt (HAp). Autorzy wykazali jak wielkie podobieństwo do budowy kości przejawia sztuczny hydroksyapatyt. opisali syntezy powłoki z HAp.
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Conducting Polymer Microelectrodes Anchored to Hydrogel Films
PublicationArtykuł prezentuje wytwarzanie organicznych hydrożeli z mikroelektrodami poli(3,4-ethylenedioxythiophene, PEDOT), które wykazują obniżoną rezystywność 100 Ω/□. Proces przygotowania rozpoczyna się elektroosadzania przewodzącego PEDOT (ok. 20 S/cm) na mikroelektrodach Pt. Elektrolityczne wiąże się film PEDOT z hydrożelem. Tak wytworzona struktura jest odrywana elektrycznie pd podłoża.
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Emissivity of LSCO and LSFO films for bolometer applications.
PublicationPrzedstawiono sposób pomiaru oraz wyniki pomiarów emisyjności warstw LSCO i LSFO przeznaczonych na bolometry.
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Effect of transglutaminase on the solubility of chitosan-gelatin films
PublicationCelem pracy było zmniejszenie rozpuszczalności folii chitozanowo-żelatynowych w środowisku wodnym o różnym pH, poprzez usieciowanie składników przy użyciu transglutaminazy. Niemodyfikowane enzymatycznie folie rozpuszczały się w temperaturze pokojowej w 86 i 64% odpowiednio w buforze o pH 3 i 6. Ich rozpuszczalność została ograniczona do 19-23% po usieciowaniu polimerów enzymem w stężeniu 0.2mg/ml filmotwórczego roztworu. Enzymatycznie...
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The photoconductivity of sol-gel derived TiO2 films.
PublicationPrzygotowano metodą zol-żel warstwy TiO2 na podłożu kwarcowym. Zbadano ich fotoprzewodnictwo w różnych warunkach. Stwierdzono, że fotoprąd w próżni jest o trzy rzędy większy niż w powietrzu. Jako wyjaśnienie zaproponowano absorpcję tlenu na powierzchni warstwy.
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Singlet exciton interactions in solid films of Alq3.
PublicationW pracy tej na podstawie pomiarów zależności wydajności fluorescencji od natężenia światła wzbudzjącego, wyznaczono stałą oddziaływania ekscyton singletowy - ekscyton singletowy w warstwie organicznego kompleksu aluminium Alq3.
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Ireneusz Kreja dr hab. inż.
PeopleGraduated from the mathematical class at the Nicolaus Copernicus High School in Gdańsk (1974). Master of Sciences in Civil Engineering after studies at Gdansk University of Technology (GUT), Poland (1974-1979). Since 1979 became an employee of the GUT. In 1989 earned a Ph.D. degree in Civil Engineering (with grade "Summa cum Laude") from the GUT. In 2008 obtained a D. Sc. (Habilitation) degree in Civil Engineering (with grade...
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The scanning spreading resistance microscopy (SSRM) studies of heavy boron-doped diamond oxidation under high-temperature
Open Research DataThe dataset contains the results of scanning spreading resistance microscopy (SSRM) of heavy boron-doped diamond (BDD) electrodes subjected to high-temperature oxidation in a furnace at 600 Celsius. The micrographs reveal the local change of electric properties at certainly crystallographic orientations of BDD grains and at the grain boundaries due...
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Thin layer chromatography in drug discovery process
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Static and dynamic analysis of thin-walled frames
PublicationW pracy przedstawiono model ramy zbudowanej z elementów cienkościennych o przekrojach otwartych stosowany w analizie statycznej i dynamicznej za pomocą metody elemntów skończonych. Model składa się z elementów opisanych teorią prętów cienkościennych o przekrojach nieodkształcalnych oraz superelementów węzłowych. Proponowany model pozwala na ujęcie w analizie efektów bimomentowych oraz deformacji konstrukcji w miejscach lokalizacji...
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A method for the tribological testing of thin, hard coatings
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Sensitivity analysis of thin-walled beams and frames.
PublicationPraca zawiera pełen tekst referatu wygloszonego na Konferencji w Wilnie.Referat przedstawia problem numerycznej analizy wrażliwości belek i ramstalowych zbudowanych z bi-symetrycznych profili cienkościennychpoddanych skręceniu lub skręceniu ze zginaniem. Przedstawiono wynikianalizy wrażliwości przemieszczeń i sił wewnętrznych przy zmianiegrubosci półek, sztywności dodatkowych stężeń poprzecznych orazszerokości przewiązek.
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Random height of thin layer of rheological liquids
PublicationPraca prezentuje nowe modele funkcji gęstości w rozkładach Gaussa, opisujących losowo zmieniającą się wysokość szczeliny w stawie biodrowym człowieka przy uwzględnieniu właściwości reologicznych synowialnej cieczy smarującej.
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Modeling and simulation of thin-walled beams and frames
PublicationPrzedstawiono koncepcję zastosowania superelementów węzłowych do modelowania połączeń słupów i rygli ram zbudowanych z prętów cienkościennych oraz stężeń konstrukcyjnych w belkach cienkościennych. Przeprowadzono analizę pracy ramy stalowej zbudowanej z prętów cienkościennych ze szczególnym uwzględnieniem problemu przekazywania bimomentu poprzez węzeł takiej ramy.
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Fabrication and Significant Photoelectrochemical Activity of Titania Nanotubes Modified with Thin Indium Tin Oxide Film
PublicationOrdered titanium dioxide nanotubes (TiO2NTs) modified with indium tin oxide (ITO) films were obtained via magnetron sputtering, in which ITO plate was used as a target, onto the as-anodized titania support followed by the calcination process. The morphology of fabricated material with deposited oxide was investigated using scanning electron microscopy. Raman and UV–Vis spectroscopies were utilized to characterize crystalline phase...
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Experimental Evaluation of ND: YAG Laser Parameters and Sample Preparation Methods for Texturing Thin AISI 316L Steel Samples
PublicationIn mechanical and material engineering, the effect of laser texturing depends on many factors besides device specification, primarily the properties of the materials being processed, and, secondly, the preparation of the sample. Laser texturing of thin (<5 mm) samples is mostly performed utilizing short-pulse lasers, but depending on the power of the laser beam, the process can also be performed by using continuous operation lasers....
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Patterned hydrophobic and hydrophilic surfaces of ultra-smooth nanocrystalline diamond layers
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Electrochemical oxidation of ionic liquids at highly boron doped diamond electrodes
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Electrochemical oxidation of ionic liquids at highly boron doped diamond electrodes
PublicationUtlenianie elektrochemiczne przy zastosowaniu elektrod diamentowych wysoko domieszkowanych borem (BDD) było badane pod względem przydatności do utylizacji roztworów zawierających ciecze jonowe (ILs). Dwustronne elektrody Si/BDD przygotowano metodą chemicznego osadzania z fazy lotnej wspomaganego plazmą (MW PE CVD). Badanie przy użyciu skaningowej mikroskopii elektronowej (SEM) potwierdziło, że wytworzone warstwy były ciągłe i miały...
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The ab initio calculations of single nitrogen-vacancy defect center in diamond.
PublicationW artykule zaprezentowano rezultaty kwantowomechanicznych obliczeń ''ab initio'' struktury elektronowej defektu azot-wakans w diamencie. Do obliczeń wykorzystano model złożony z 63 atomów. Otrzymane wyniki zostały porównane z wcześniejszymi pracami teoretycznymi i doświadczalnymi.