Marcin Gnyba

• PhD E.E. in Electronics
• Gdansk University of Technology

We report a method of growing a boron-doped diamond film by plasma-assisted chemical vapour deposition utilizing a pre-treatment of GaN substrate to give a high density of nucleation. CVD diamond was deposited on GaN substrate grown epitaxially via the molecular-beam epitaxy process. To obtain a continuous diamond film with the presence of well-dev...

The presented research was intended to seek new optical methods to investigate the demineralization process of bones. Optical examination of the bone condition could facilitate clinical trials and improve the safety of patients. The authors used a set of complementary methods: polarization-sensitive optical coherence tomography (PS-OCT) and Raman s...

Aim of the presented research was to develop an optical sensing system to investigate the demineralization process of the bones. Optical measurement techniques are widely used and increasingly adapted in biological and biomedical applications due to their non-destructive nature and safety. Optical examination of the bone condition could facilitate...

The variable configuration of Raman spectroscopic platforms is one ofthe major obstacles in establishing Raman spectroscopy as a valuable physicochemicalmethod within real-world scenarios such as clinical diagnostics. For such real worldapplications like diagnostic classification, the models should ideally be usable to predictdata from different se...

NMR and Raman spectroscopy studies were performed for different 3-aminopropyl(trimethoxy)- and 3-glycidoxypropyl(trimethoxy)silane based sol-gel systems containing different ketones. Exceptionally stable imine products were obtained depending on a reaction system at alkaline pH conditions and in the presence of water. These imine formation reaction...

The main subject of this study are molecular structures and optical properties of boron-doped diamond films with [B]/[C] ppm ratio between 1000 and 10 000, fabricated in two molar ratios of CH 4 -H 2 mixture (1 % and 4 %). Boron-doped diamond (BDD) film on the fused silica was presented as a conductive coating for optical and electronic purposes. T...

Recently much scientific research and industrial work is conducted in multidisciplinary teams, where cooperation between specialists from different areas of expertise is required in order to successfully address the challenging goals. Moreover, in start-up small companies the lack of supporting departments calls for additional multidisciplinary, ec...

In this study we have demonstrated the fabrication of novel material called boron-doped carbon nanowalls (B:CNW) which is characterized by remarkable electrochemical properties like high standard rate constant k?, low peak to peak separation value (?E) for oxidation and reduction processes of [Fe(CN)6]3-/4- redox system and low surface resistivity....

Hydroxyapatite (HAp) has been attracting widespread interest in medical applications. In a form of coating, it enables to create a durable bond between an implant and surrounding bone tissues. With addition of silver nanoparticles HAp should also provide antibacterial activity. The aim of this research was to evaluate the composition of hydroxyapat...

This paper presents boron-doped diamond (BDD) film as a conductive coating for optical and electronic purposes. Seeding and growth processes of thin diamond films on fused silica have been investigated. Growth processes of thin diamond films on fused silica were investigated at various boron doping level and methane admixture. Two step pre-treatmen...

The fabrication process of thin boron-doped nanocrystalline diamond (B-NCD) microelectrodes on fused silica single mode optical fiber cladding has been investigated. The B-NCD films were deposited on the fibers using Microwave Plasma Assisted Chemical Vapor Deposition (MW PA CVD) at glass substrate temperature of 475 degrees C. We have obtained hom...

Preclinical research of biomedical optoelectronic devices is often performed with the use of blood phantoms — a simplified physical model of blood. The aim of this study is the comparison and distinction between blood phantoms as well as whole human blood measurements. We show how the use of such phantoms may influence the incorrect interpretation...

Although titanium and its alloys are widely used as implant material for orthopedic and dental applications they show only limited corrosion stability and osseointegration in different cases. The aim of the presented research was to develop and characterize a novel surface modification system from a thin diamond base layer and a hydroxyapatite (HAp...

A dedicated absorption spectroscopy system was set up using tungsten-halogen broadband source, optical fibers, sample holder, and a commercial spectrometer with CCD array. Analysis of noise present in the setup was carried out. Data processing was applied to the absorption spectra to reduce spectral noise, and improve the quality of the spectra and...

In this paper we present a proof-of-concept of a Raman spectroscopy-based approach for measuring the content of propofol, a common anesthesia drug, in whole human blood, and plasma, which is intended for use during clinical procedures. This method utilizes the Raman spectroscopy as a chemically–sensitive method for qualitative detection of the pres...

In this article the simultaneous investigation of blood parameters by complementary optical methods, Raman spectroscopy and spectral-domain low-coherence interferometry, is presented. Thus, the mutual relationship between chemical and physical properties may be investigated, because low-coherence interferometry measures optical properties of the in...

The in fluence of various nanodiamond colloids used for seeding nondiamond substrates in microwave plasma enhanced chemical vapour deposition diamond process was investigated. Colloids based on deionized water, isopropanol alcohol and dimethyl sulfoxide (DMSO) were used with diff�erent grain size dispersion: 150, 400 and 35 nm, respectively. The in...

Fabrication process of thin boron-doped nanocrystalline diamond (B-NCD) microelectrode on fused silica single mode optical fiber has been investigated. The B-NCD films were deposited on the fibers using Microwave Plasma Assisted Chemical Vapor Deposition (MW PA CVD) at glass substrate temperature of 475 °C. We have obtained homogenous, continuous a...

A proof-of-concept study of a Raman spectroscopy-based approach for measuring the content of anesthesia drugs in blood is presented. Spectra of spiked blood from several patients exhibit prominent changes in regions associated with the drug.

Our aim is to optically monitor the delivery of the chemotherapy drugs for brain tumours, particularly used in the central nervous system (CNS) lymphoma therapy. In vivo monitoring would help to optimize the treatment and avoiding unnecessary medications. Moreover, it would be beneficial to be able to measure which of the multi-regimen drugs actual...

The paper presents nanocrystalline boron-doped diamond (B-NCD) film as a coating for optical fibres. Seeding and growth processes of thin diamond films on fused silica optical fibres have been investigated. B-NCD films were deposited using Microwave Plasma Assisted Chemical Vapour Deposition (MW PA CVD). Optical fibre pre-treatment by dip coating i...

In this paper, the growth of polycrystalline chemical vapour deposition (CVD) diamond thin films on fused silica optical fibres has been investigated. The research results show that the effective substrate seeding process can lower defect nucleation, and it simultaneously increases surface encapsulation. However, the growth process on glass require...

This paper reports preliminary studies on use of Raman spectroscopy for investigation of blood. High quality blood spectra were recorded in-vitro with excitation wavelengths of 830 nm. Because of complex composition of the blood as well as by light attenuation and scattering in the tissues, spectra set up from wide, low-intensive Raman bands and in...

An optical method for hematocrit measurement is presented. The sensor, designed and developed by authors, consists of a spectroscopic set-up and a microcontroller. The work of the sensor is based on measurement of intensity of two selected spectral bands. Tests confirmed the ability of the sensor to determine the hematocrit level with appropriate m...

Nucleation and growth processes of thin diamond films on fused silica optical fibres have been investigated. Fibres were coated with diamond film using microwave plasma enhanced chemical vapour deposition (µPE CVD) system. Since the growth of diamond on the fused silica glass requires high seeding density, two types of glass pre-treatment were appl...

The boron-doped diamond (BDD) electrodes with different boron concentrations have been tested as electrode material for sulphamerazine (SRM) oxidation in water solution. An investigation of the electrode morphology and molecular structure was carried out using high resolution scanning electron microscopy (SEM) and Raman spectroscopy. Electro-chemic...

We have used reflectance spectroscopy for the in-situ, non-invasive monitoring of a thin oil film thickness during extrusion process of ceramic paste in capillary rheometer. Investigated pastes are disperse solid liquid systems prepared from the silicone oil AK106 (Wacker) and ceramic powder AlOOH. The thin oil film, extracted from the extruded pas...

Studies of application of Raman spectroscopy in measurement of important parameters of rheometric process, including profile of oil film thickness and composition of oil/paste system, were carried out. The films of silicone oil AK106 (Wacker) extracted from ceramic paste AlOOH were subjects of investigations presented in this paper. Boundary betwee...

In this study the efficiency of electrochemical oxidation of aromatic pollutants, such as reactive dyes, at boron-doped diamond on silicon (Si/BDD) electrodes was investigated. The level of [B]/[C] ratio which is effective for the degradation and mineralization of selected aromatic pollutants, and the impact of [B]/[C] ratio on the crystalline stru...

Raman spectorscopy was applied to study the reactions between amine and epoxy groups, which had been expected to proceed during synthesis of hybrid polymer based on three monomers: 3-aminopropyltrimethoxysilane, 3-glycidyloxypropyl-trimethoxysilane and methacryloxy-propyltrimethoxysilane. Efficiency of the investigated reaction determines the molec...

A boron-doped diamond (BDD) sensor was proposed for effective detection of chemical oxygen demand (COD) by means of amperometric technique. Thin boron doped diamond active sensor layer was deposited on Si wafer and glassy carbon substrate by Microwave Plasma Enhanced Chemical Vapor Deposition (MW PE CVD). The structure of BDD was confirmed by Raman...

A Raman spectroscopic study was carried out in order to investigate the synthesis process of organically modified silane (ORMOSIL) hybrid polymers. These materials were prepared for optoelectronic application, using the sol-gel technology. Our aim was to analyse the ability of Raman measurements to estimate the efficiency and correctness of particu...

We used Optical Emission Spectroscopy (OES) as a non-invasive optoelectronic tool of in-situ monitoring of plasma discharge. The low-temperature plasma, based on mixture of CH$_{4}$ and H$_{2}$, was produced during Microwave Plasma Assisted Chemical Vapour Deposition ($\mu $PA CVD) synthesis process of thin diamond/DLC films. Molecular modelling sh...

The aim of the presented study is to investigate the applicability of electrochemical oxidation of aromatic compounds containing heteroatoms, e.g. waste from production of pesticides or pharmaceutics, at a borondoped diamond (BDD) electrode. The BDD electrodes were synthesized by microwave plasma enhanced chemical vapour deposition (MW PE CVD). Inv...

Development of Raman spectroscopic system for diagnostics of growth of diamond and BDD (Boron-Doped-Diamond) thin films during μPA CVD (Microwave Plasma Assisted Chemical Vapour Deposition) process is described. Raman studies of such films were carried out as in-situ monitoring of film deposition as ex-situ measurements conducted for a sample outsi...

An electrochemical oxidation using a highly boron-doped diamond (BDD) electrode has been tested for the treatment of solutions containing ionic liquids (ILs). The double-sided Si/highly BDD electrodes were synthesized by microwave plasma enhanced chemical vapour deposition (MW PE CVD). Investigation of the electrode surface with scanning electron m...

A boron-doped diamond (BDD) sensor is proposed for effective detection of chemical oxygen demand (COD) by means of amperometric technique. Boron-doped diamond thin films, acting as active sensors, were deposited on both silicon wafer and glassy carbon (GC) substrates by microwave plasma assisted chemical vapour deposition. SEM micrographs showed th...

A boron-doped diamond (BDD) sensor was proposed for effective detection of chemical oxygen demand (COD) by means of amperometric technique. Thin boron doped diamond active sensor layer was deposited on Si wafer and glassy carbon substrate by Microwave Plasma Enhanced Chemical Vapor Deposition (MW PE CVD). The structure of BDD was confirmed by Raman...

Development of Raman spectroscopic system for diagnostics of growth of diamond and BDD (Boron- Doped-Diamond) thin films during μPA CVD (Microwave Plasma Assisted Chemical Vapour Deposition) process is described. Raman studies of such films were carried out as in-situ monitoring of film deposition as ex-situ measurements conducted for a sample outs...

Detection of illicit chemicals by portable Raman spectrometer The Raman spectrometers can be built as the portable devices and can be used in various places to detect illicit chemicals. This method has become popular due to deficiency of other fast methods that could be applied against terrorist attacks or could help police at their work. The Conce...

In this paper use of selected optical methods of a hematocrit measurement has been presented. Elab- orated methods have numerous advantages: relatively simple configurations, potentially low cost and high resolution. Investigation confirmed their ability to determine the hematocrit value with appropriate measure- ment accuracy. Furthermore, simulta...

In this paper low-coherence fibre-optic sensors based on the Fabry–Perot and Michelson interferometer, which were designed and elaborated at our laboratory, are shown. We present results of investigation of the fibre-optic sensors working in both configurations. These results allowed us to compare properties of sensors working in both configuration...

Portable Raman spectrometer - design rules and applications Raman spectroscopy has become more popular due to its new prospective field applications in forensic sciences, war against terrorism, environment protection and other field chemical analysis. Raman spectrometers can be miniaturised to portable devices and their price is decreasing due to d...

During the last thirty years low-coherence measurement methods have gained popularity because of their unique advantages. Low-coherence interferometry, low-coherence reflectometry and low-coherence optical tomography offer resolution and dynamic range of measurement at the range of classical optical techniques. Moreover, they enable measurements of...

Algorithms of Chemicals Detection Using Raman Spectra Raman spectrometers are devices which enable fast and non-contact identification of examined chemicals. These devices utilize the Raman phenomenon to identify unknown and often illicit chemicals ( e.g. drugs, explosives) without the necessity of their preparation. Now, Raman devices can be porta...

Development of the optoelectronic system for monitoring of diamond/DLC (Diamond-Like-Carbon) thin films growth during μPA ECR CVD (Microwave Plasma Assisted Electron Cyclotron Resonance Chemical Vapour Deposition) process is described. The multi-point Optical Emission Spectroscopy (OES) and Raman spectroscopy were employed as non-invasive optoelect...

Development of the optoelectronic system for non-invasive monitoring of diamond/DLC (Diamond-Like-Carbon) thin films growth during ?PA ECR CVD (Microwave Plasma Assisted Electron Cyclotron Resonance Chemical Vapour Deposition) process is described. The system uses multi-point Optical Emission Spectroscopy (OES) and long-working-distance Raman spect...

The development of an optoelectronic system for Raman spectroscopic monitoring of diamond/DLC (Diamond-Like-Carbon) thin films growth during μPA ECR CVD (Microwave Plasma Assisted Electron Cyclotron Resonance Chemical Vapour Deposition) process is described. A modular system for non-invasive in-situ monitoring equipped with fibre-optic probes was d...

Manufacturing process of Wollaston prisms using ZLI-1957 Liquid Crystal (LC) mixture and waveplates from RMS03-001 Liquid Crystalline Polymer (LCP) is presented. The Wollaston prism presented in the paper has the splitting angle of 0.37 mrad, and can be used in optical setups where very straight fringes are not required. Produced LCP waveplates exh...

Low-coherence interferometric sensors are an important group of optical fibre sensors. Combining high measurement resolution with broad measurement range, these sensors can measure accurately several physical quantities e.g. temperature. In this article we present the fiber-optic temperature sensor using low-coherent interferometry, which has...

A system for in-situ Raman monitoring of thin film growth during Microwave Plasma Assisted Chemical Vapour Deposition (μPACVD) process was developed. Dedicated Raman probe system was designed for precise focusing of an excitation laser beam into the growing film. The probes have to be placed outside the reaction chamber (working distance about 20 c...

Birefringent components, such as waveplates, Wollaston or Nomarski prisms, used in acoustic transducers can be made from Liquid Crystals or Liquid Crystalline Polymers (LCPs). This may result in better integration of optical setups and in reduced cost and complexity of these transducers. Since Wollaston or Nomarski prisms made from these materials...

Analysis of important metrological problems of Raman investigation of solid state thin films is given in this paper. Raman studies of such films can be carried out as ex-situ measurements conducted for a sample outside the reaction vessel after manufacturing process or as in-situ monitoring of film deposition. First approach gives more possibilitie...

Optical methods were applied to investigate sol-gel derived, thin-film components for integrated optics. Raman microscopy yielded information about molecular composition of materials, efficiency of reactions and thickness profile of the structures. Spectroscopic reflectometry, optical microscopy, and low-coherent profilometry confirmed dimensions a...

Authors designed and built a Raman spectroscopic system for non-invasive, remote, on-line monitoring of gelation, which is the first step of a sol-gel process used for synthesis of hybrid polymers for photonics. The system was connected with typical glass reaction vessel. Suitable design of an optical system reduced excitation of interfering Raman...

Raman spectroscopic studies were carried out for hybrid polymer thin films prepared for photonic applications by the sol-gel technology. Our aims were to analyse the ability of the Raman method to estimate the efficiency of the main reactions of the sol-gel process and to provide information about the chemical composition of the films as well as th...

Being a relatively low-temperature technique, the sol-gel technology enables the synthesis of hybrid polymers doped by organic dyes. In order to ensure the required properties of the final product, however, the mixing of sol and dye must be strictly controlled to avoid unwanted chemical reactions between them. Raman spectroscopic in-situ monitoring...

Principles of integrated optical sensors based on polarimetric interferometry are presented in the paper. A wide area of their applications in biochemistry includes monitoring of protein concentration in solutions, detection of antibodies as well as indirect investigation of chemical reactions, based on precise measurement of complex refractive ind...

Sol–gel adhesive material for isostatic hotpressing lamination process was synthesized using 3-aminopropyltrimethoxysilane (APTES), 3-glycidyloxypropyltrimethoxysilane (GPTS) and methacryloxypropyltrimethoxysilane (MPTS) as precursors. Reaction dynamics between APTES and GPTS was followed on-line with Raman spectroscopy. The lamination process was...

Recent studies about non-contact temperature measurement concern passive multiband radiometric systems. These systems give a potential possibility of accurate temperature measurements in case of unknown and wavelength depended emissivity of the examined object. Modeling of such systems, what is usually the first stage of system designing, requires...

Mid-IR absorption and Raman scattering measurements were carried out for ferroelectric ceramics with composition of Ba(Ti1-xZrx)O3. The main aim of presented research was to analyze the ability of these complementary optical methods to estimate the efficiency of manufacturing process as well as to investigate the molecular strcuture of synthesized...

Permanent development of photonics stimulates a searching for new materials, which have better optical, mechanical and electrical properties. One of the new classes of materials with large application and development potential are hybrid polymers, synthesized in sol-gel technology. Thanks to incorporation of organic components into an in organic ne...

A fiberoptic Raman spectroscopy system was adapted to remote measurements made in conditions typical for chemical industry. This technique was used to diagnose a process of synthesis of amine-epoxy based hybrid polymers, developed as a new class of adhesive materials for optics. Hybrids, manufactured in sol-gel technology, have a great application...

A Raman spectroscopy was used to diagnose a synthesis process of new class of materials - hybrid polymer thin films, dedicated to planar optical waveguides. Hybrids, made in sol-gel technology, have a great application potential, because their properties may be formed in wide range. However, to obtain high quality product, a strict control of the m...

Raman spectroscopic studies were carried out to investigate the synthesis of hybrid polymers prepared for photonic applications by a sol-gel technology. The main aim was to analyse the ability of Raman measurements to estimate the efficiency and correctness of particular stages of the technological process. Parameters of measurement systems adequat...