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1
Content available remote

Raman Microscopic Analysis of a Multi-Pigmented Surface from the Theban Tomb (TT277), Luxor, Egypt

100%
Marey Mahmoud H.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 4
782-785
EN
In this study, the Raman microscopy technique was employed for identifying a multi-pigmented surface from the wall decorations of the Theban tomb (TT277), Luxor, Egypt. The Raman spectra were collected in the near infrared excitation line (785 nm Linefocus) of a diode laser source which enables mapping scan of specific areas in only few minutes. The microstructure and microanalysis of samples were performed by the aid of an environmental scanning electron microscopy coupled with an energy dispersive X-ray analysis system. The identified pigments were red ochre (haematite), yellow ochre (goethite) and carbon black (from a vegetable origin). Traces of anatase were found in the yellow coloured areas which can be a contaminant in natural iron oxide deposits. The ground layer was identified as anhydrite with minor amounts of calcium carbonates detected in some samples. The results showed the capability of the Raman microscopy for direct and fast identification of multi-pigmented surfaces in wall paintings and other decorative objects.
2
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FT-IR/PAS Studies of Lunar Regolith Samples

100%
Pasieczna-Patkowska S., Dąbrowski A., Robens E., Ryczkowski J.
Acta Physica Polonica A
|
2008
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vol. 114
|
issue 6A
A-163-A-168
EN
This paper describes investigations of the surface properties of lunar regolith powder samples from the Apollo 11, 12, and 16 missions, respectively. For this part of studies conducted at the Faculty of Chemistry, Maria Curie-Skłodowska University a Fourier transform infrared photoacoustic spectroscopy was applied.
3
Content available remote

Identification of Corrosion Products on Fe and Cu Metals using Spectroscopic Methods

51%
Święch D., Paluszkiewicz C., Piergies N., Pięta E., Lelek-Borkowska U., Kwiatek W.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 2
286-288
EN
In this study, the Fourier-transform infrared absorption and the Raman spectroscopies for analysis of corrosion products formed on the Fe and Cu metal surfaces after deposition in the chloride containing solution, were used. The obtained spectral patterns show that main constituent species of the corrosion products for Fe metal sample is lepidocrocite, while in the case of Cu surface there is formed mainly paratacamite. The obtained results confirm that application of vibrational spectroscopic methods is precise tool for identification and analysis of the corrosion products.
4
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Formation of Hydrogen Bonds; Hydroxyl and Methyl Groups Dynamics in 2,2-dimethylbutan-1-ol and 2,3-dimethylbutan-2-ol: DFT, IINS and IR Investigations

51%
Juszyńska E., Hołderna-Natkaniec K., Massalska-Arodź M., Natkaniec I., Ściesińska E., Ściesiński J.
Acta Physica Polonica A
|
2012
|
vol. 122
|
issue 4
765-775
EN
Dynamics of 2,2-dimethylbutan-1-ol and 2,3-dimethylbutan-2-ol have been studied by experimental spectroscopy methods, i.e., inelastic incoherent neutron scattering and infrared absorption. Experimental results were discussed and compared with the results of the quantum chemical calculations performed by semi-empirical PM3 and the density functional theory methods assuming the isolated molecule and dimer, trimer and tetramer clusters. The density functional theory modelling of vibrational spectra of monomers and OH bonded molecular clusters allows to assign the inter- and intermolecular vibrational modes observed in density of states and absorption spectra.
5
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Different Wavelength Laser Irradiation of Amorphous Carbon

51%
Grigonis A., Rutkuniene Z., Vinciunaite V.
Acta Physica Polonica A
|
2011
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vol. 120
|
issue 1
26-29
EN
Coherent laser irradiation of amorphous carbon films formed on Si substrates by ion beam deposition from pure acetylene and acetylene/hydrogen gas mixture is analyzed in this work. The films were irradiated with nanosecond YAG:Nd laser (Ekspla NL301G) at the first (1064 nm, 6 ns), the second (532 nm, 4.2 ns) and the third (355 nm, 28 ns) harmonic by scanning or repeating (10 pulses to one point) regime. Irradiation by the first laser harmonic leads to a minor increase of graphite phase content and shows SiC formation. Formation of carbides was observed at the second harmonic irradiation when irradiation intensity is low (< 10 MW/cm^2). Graphitization became more intensive when power density of irradiation increased and the films transformed to the glass carbon and nano/micro crystallite compound at intensive ablation regime ( ≈ 24 MW/cm^2). Early ablation starts at irradiation by the third laser harmonic with the intensity of ≈ 8 MW/cm^2 with an increase of Si substrate roughness. Swelling of films was obtained when the sample was irradiated at the third harmonic with 1 MW/cm^2.
6
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Infrared Spectroscopic Identification of Chosen Dental Materials and Natural Teeth

51%
Hędzelek W., Marcinkowska A., Domka L., Wachowiak R.
Acta Physica Polonica A
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2008
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vol. 114
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issue 2
471-484
EN
Studies using solid phase infrared spectroscopy in the range of 400 to 4000 wave numbers were conducted in order to quickly identify solid tooth fragments and differentiate them from dental materials used in the dental practice. The frequently employed dental materials were evaluated. Natural chemical structure of permanent teeth obtained from donors of various ages provided the reference material. The infrared vibrations detected in infrared transmission spectra depended on the chemical structure of examined compound. Comparable distinctive peaks in infrared spectra of natural teeth and inorganic dental materials (porcelain) were exhibited. Analogous infrared spectra of dental materials consisting of organic matrix with inorganic fillers were found. In the case of acrylic materials specific organic groups were enhanced. The prepared database of infrared transmission spectra included 23 dental materials, facilitating their appropriate identification. Application of infrared spectroscopy allowed for a quick differential identification of typical dental materials produced from organic compounds for inorganic restorations (porcelain) and of tooth structure-resembling hydroxyapatite and its contaminate forms with fluoride and carbonate ions.
7
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Optimization of Polycrystalline CVD Diamond Seeding with the Use of sp³/sp² Raman Band Ratio

51%
Golunski L., Sobaszek M., Gardas M., Gnyba M., Bogdanowicz R., Ficek M., Plotka P.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 1
136-140
EN
The influence 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 different grain size dispersion: 150, 400 and 35 nm, respectively. The influence of growth time was also taken into consideration and bias enhanced nucleation. Microcrystalline diamond films were deposited on the seeded substrates in microwave plasma chemical vapour deposition using hydrogen-methane gas mixture. Seeding efficiency was investigated by means of scanning electron microscopy and Raman spectroscopy. Authors defined the new factor called as diamond ideality factor (di) which can give a quick estimation of quality of film and relative sp³ content. Few main peaks were identified at the following wave numbers: diamond sp³ peak 1332 cm^{-1}, D band peak 1355 cm^{-1}, C-H bending peak 1440-1480 cm^{-1} and G band peak 1560 cm^{-1}. The best di was achieved for DMSO based colloid in all cases. The application of bias enhanced nucleation increases the diamond crystals size and the sp³/sp² ratio.
8
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Nanostructure Formation during Amorphous Carbon Films Deposition

51%
Rutkuniene Z., Vigricaite L., Grigonis A.
Acta Physica Polonica A
|
2014
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vol. 125
|
issue 6
1303-1306
EN
Influence of Cu particles for the carbon nanostructures formation during a-C:H films deposition by plasma enhanced chemical vapor deposition method from pure acetylene gas plasma were analyzed in this work. Silicon wafer and Cu target were simultaneously bombarded by Ar^{+} ions for the Cu particles deposition on the silicon before a-C:H films formation. It was obtained that hydrogenated silicon carbide forms on this defected Si/Cu surface during the first stage of carbon film deposition. Structure of a:C-H films and conditions of nanostructures formation depended on substrate temperature and Cu concentration in the film, then deposition time was 300 s.
9
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Investigation of Infrared and Raman Spectra of TeO_2-Nb_2O_5-TiO_2 Glasses

51%
Kabalci İ., Gökçe H.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 4
877-881
EN
X-ray diffraction, infrared (IR), Raman spectroscopy and scanning electron microscope techniques have been used to investigate the microstructural properties of the glass materials. In this work, a new type of tellurite based optical glasses with TeO_2/Nb_2O_5/TiO_2 for different xNb_2O_5 (x = 5, 10, 15, and 20 mol.%) glass compositions at constant 5 mol.% TiO_2 ratio were prepared. The effect of Nb_2O_5 contents on the structural unit of (95-x)TeO_2-(x)Nb_2O_5-5TiO_2 glass network, and the intensity ratios of the Raman peaks were investigated. The results indicate that for different Nb_2O_5 content 5 to 20 mol.% in the glass system, three vibrational peaks around 650, 800, and 920 cm^{-1} which correspond to the structural bonding of the glass were observed in the range of 500-2000 cm^{-1} for the IR spectra. Furthermore, from the Raman results a structural evolution was determined with the number of structural units such as [NbO_6]^{7-}, TeO_{3+1} (polyhedra), TeO_4 (trigonal bipyramids), TeO_3 (trigonal pyramids) or TeO_{3+1} (polyhedra), and [NbO_4]^{3-} for this ternary glass system.
10
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Raman Spectroscopy of LiFePO_4 and Li_3V_2(PO_4)_3 Prepared as Cathode Materials

51%
Ziółkowska D., Korona K., Kamińska M., Grzanka E., Andrzejczuk M., Wu S., Chen M.
Acta Physica Polonica A
|
2011
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vol. 120
|
issue 5
973-975
EN
Structure of samples of lithium iron vanadium phosphates of different compositions were investigated by X-rays, electron microscopy and Raman spectroscopy. The investigated salts were mainly of olivine-like and NASICON-like structures. The X-ray diffraction and the Raman scattering show different crystalline structures, which is probably caused by difference between cores of the crystallites (probed by X-rays) and their shells (probed by the Raman scattering). Most of the Raman spectra were identified with previously published data, however in the samples with high vanadium concentration we have observed new, not reported earlier modes at 835 cm^{-1} and 877 cm^{-1}, that we identified as oscillations related to V_2O_7^{4-} or VO_4^{3-} anions.
11
Content available remote

Changes in Amorphous Hydrogenated Carbon Films by Ultraviolet and Infrared Laser Irradiation

51%
Vinciūnaitė V., Grigonis A., Medvid A., Zabels R.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 5
874-876
EN
Amorphous hydrogenated carbon films were formed on the Si (100) wafers by a direct-ion beam deposition method from pure acetylene and acetylene-hydrogen gas mixtures. The films were irradiated with a nanosecond Nd:YAG laser working at the first harmonics (λ_1=1064 nm), the fourth harmonics (λ_4=266 nm) or with a Nd:YVO_4 laser working at the third harmonic (λ_3=355 nm). The films were studied by the Raman scattering, micro-Fourier transform infrared and Fourier transform infrared spectroscopies, null-ellipsometry, optical and scanning electron microscope, and Vickers hardness method. Irradiation by the wavelength λ_1=1064 nm leads to graphitization and formation of the silicon carbide, because of the silicon substrate decomposition. The samples were strongly modified after the irradiation by λ_3=355 nm - the thickness of the films decreased, and silicon carbide was formed. It was observed that nano-structured materials (e.g. carbon nano-onions, nc-diamond) were formed after the irradiation by λ_4=266 nm.
12
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Nanocrystalline CVD Diamond Coatings on Fused Silica Optical Fibres: Optical Properties Study

45%
Ficek M., Bogdanowicz R., Ryl J.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 3
868-873
EN
Seeding and growth processes of thin diamond films on fused silica optical fibres have been investigated. Glass pre-treatment by dip coating in two detonation nanodiamond (DND) seeding media has been studied. The DND suspension in ethyl alcohol and dispersion of DND in dimethyl sulfoxide (DMSO) with polyvinyl alcohol (PVA) were chosen for the seeding purpose. The grain size distribution of nanodiamond particles in both seeding media was kept at the same level (approximately 10-50 nm). After the seeding nanocrystalline diamond films were deposited on the fibres using microwave plasma assisted chemical vapour deposition system. The results of the process were investigated using numerical analysis of scanning electron microscopy images. The molecular structure of diamond has been examined with micro-Raman spectroscopy. Thickness, roughness and optical properties of the nanocrystalline diamond films in VIS-NIR wavelength range were investigated on reference samples using spectroscopic ellipsometry. Light reflection at the fibre end-face for different deposition parameters was also investigated. Proposed seeding method can be further effectively applied for manufacturing of optical fibre sensors. Due to extraordinary properties of diamond, which include high chemical and mechanical resistance, such films are highly desired for optical sensing purposes.
13
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Investigation of Sediments Causing Damage to Water Meters in a Large Drinking Water Distribution System

45%
Kopeć M., Roman M., Kąc M., Budziak A., Paluszkiewicz C., Zarzycki A., Kąc S., Dutkiewicz E., Cichoń T., Bochnia T., Kwiatek W.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 2
296-301
EN
Preliminary studies on the sediments collected from water meters of Krakow water supply system were performed in the cooperation with the Municipal Water Supply and Sewage. Creation and deposition of sediments on the measuring devices installed in the water supply system is a serious technological and economical problem for water companies, defectively operating for this reason water meters must be replaced. It is evident that knowledge of the chemical and phase composition of sediments is an important step towards resolving the problem of impurities in water supply systems. Four different samples of sediments, coming from water meters, were investigated using the proton-induced X-ray emission, the X-ray diffraction, the Fourier transform infrared and Raman spectroscopy. The X-ray methods revealed presence of amorphous and fine-crystalline phases as well as high content of iron-based compounds. As a crystalline phase, the most frequently appeared: goethite, lepidocrocite, iron oxides (hematite, maghemite, magnetite), calcium carbonate, and quartz. In one of the samples, the nanocrystalline phase was found and identified as hydrous iron oxyhydroxide ferrihydrite. Vibrational spectroscopy methods confirmed the composition of crystalline phases as well as enabled to estimate the abundance of amorphous phase in samples.
14
Content available remote

Extension of Usable Spectral Range of Peltier Cooled Photodetectors

45%
Piotrowski A., Piotrowski J., Gawron W., Pawluczyk J., Pedzinska M.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue S
S-52-S-55
EN
This paper provides update on development of the Peltier cooled detectors optimized for wavelengths above 13 μm. Initially, the devices made by Vigo were mostly used for uncooled detection of CO_{2} laser radiation. Over the years the performance and speed of response has been steadily improved. At present the uncooled or Peltier cooled photodetectors can be used for sensitive and fast response detection in the mid-wavelength and long-wavelength infrared spectral range. The devices have found important applications in IR spectrometry, quantum cascade laser based gas analyzers, laser radiation alerters and many other IR systems. Recent efforts were concentrated on the extension of useful spectral range to > 13 μm, as required for its application in Fourier transform IR spectrometers. This was achieved with improved design of the active elements, use of monolithic optical immersion technology, enhanced absorption of radiation, dedicated electronics, series connection of small cells in series, and last but not least, applying more efficient Peltier coolers. Practical devices are based on the complex HgCdTe heterostructures grown on GaAs substrates with metal-organic chemical vapor deposition technique with immersion lens formed by micromachining in the GaAs substrates. The results are very encouraging. The devices cooled with miniature 4 stage Peltier coolers mounted in TO-8 style housings show significant response at wavelength exceeding 16 μm.
15
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FTIR Study of Multifunctional Coatings

45%
Paluszkiewicz C., Długoń E., Kwiatek W.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 2
551-554
EN
Nanoparticles of hydroxyapatite (HAp) or tricalcium phosphates (TCP) connected with fibrous phase create biomimetic system between the natural fibrous and ceramic materials building a bone. Chemical bonding between the implant and host tissue takes place through the phosphate layer, which is created on the bioactive implant surface when in contact with the body fluids environment. The Fourier transform infrared spectroscopy can yield microstructural information on the segment level complementary to the morphological information acquired from X-ray scattering as well as electron microscopy. The Fourier transform infrared method is applied to study thin films on different substrates. Moreover, the Fourier transform infrared microscope technique allows to obtain surface and cross-section maps in reflection and transmission modes. This leads to visualization of chemical imaging between substrates and films. In this work, the coatings with different addition of nanohydroxyapatite were deposited by electrodeposition method on titanium and Ti6Al4V alloys. Additionally, sublayers, such as TiO_2, were used to increase hydroxyapatite coating adhesion. The selection of suspension composition, depositing time and layer heat treatment conditions have the conclusive influence on the films parameters. All these experimental parameters were monitored during the sample preparation procedure. Changes in phase composition of biomaterials were determined by the Fourier transform infrared reflection technique based on focal plane array detection system. It has been found that results obtained by the Fourier transform infrared spectroscopy show the differences between the studied samples as well as that optimum time of HAp deposition was 90 s.
16
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Hydrothermal Synthesis of Hydroxyapatite on Titanium after Anodic Oxidation

45%
Strzała A., Simka W., Marszałek M.
Acta Physica Polonica A
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2012
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vol. 121
|
issue 2
561-564
EN
Hydrothermal synthesis of hydroxyapatite (HA) is a method which is relatively easy to apply and enables HA precipitation on substrates of various shapes, which is vital to endoprostheses fabrication. Anodic oxidation facilitates HA precipitation, making the coating thicker and more uniform. In this paper the influence of anodic oxidation of titanium substrates on HA precipitation in hydrothermal synthesis is discussed. To determine chemical composition and coating uniformity of anodised and polished Ti substrates the Raman microspectroscopy was employed. The composition was also confirmed using X-ray diffraction method. HA coatings on Ti after anodic oxidation exhibit higher uniformity in comparison to untreated Ti. The X-ray diffraction patterns showed that the HA coating was partly amorphous. Also influence of additional treatment (soaking in NaOH and/or HBSS) after anodic oxidation is discussed in the present paper. It seems that pretreatment may be favourable in some cases, but if the anodic oxidation was conducted in the presence of calcium phosphates the pretreatment seems to prevent the HA precipitation.
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