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Wyświetlanie 1-15 z 45
Tytuł:
Geological Studies by Means of Proton Microbeam System
Autorzy:
Przybyłowicz, W. J.
Powiązania:
https://bibliotekanauki.pl/articles/2028934.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.75.-i
07.78.+s
Opis:
Features necessary to make a scanning nuclear microprobe a useful tool in geological studies are summarized and its present position among other microanalytical techniques is reviewed.
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 679-686
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Nuclear Microprobe - a Challenging Tool in Plant Sciences
Autorzy:
Mesjasz-Przybyłowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2028925.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.60.-k
41.75.-i
07.78.+s
Opis:
The nuclear microprobe is a microanalytical tool capable of quantitative studies of elemental distribution at the ppm level with a spatial resolution of the order of 1μm. This sensitivity is adequate for most elements of interest, and the spatial resolution is acceptable for studies of elemental distribution in organs, tissues, and cells. The main techniques used in plant science are particle induced X-ray emission using protons, proton backscattering, scanning transmission ion microscopy, and particle induced gamma-ray emission. Specimen preparation is the most difficult part of analysis, and only cryotechniques are recommended presently for all types of microanalytical studies.
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 659-668
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fe₂O₃ and Gd₂O₃ Nanoparticles Embedded in Mesoporous Silica: Magnetic Properties Comparison
Autorzy:
Kapusta, O.
Zeleňáková, A.
Hrubovčák, P.
Girman, V.
Zeleňák, V.
Powiązania:
https://bibliotekanauki.pl/articles/1031039.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.78.+s
47.11.Kb
75.75.Cd
75.40.Cx
78.20.-e
Opis:
Nanocomposite materials containing Fe₂O₃ and Gd₂O₃ nanoparticles with the same concentration were prepared by nanocasting method. At this procedure silica matrix serves as nanoreactor for growth of nanoparticles. Temperature and external dc field dependences of the magnetization both samples were compared. Composite containing Fe₂O₃ nanoparticles shows superparamagnetic behaviour with blocking temperature around 45 K. Otherwise, paramagnetic properties were observed for the sample with Gd₂O₃ (above 10 K). Additionally, due to free pores the silica matrix could serve as medium to increase the number of bonded water molecules. These properties together with appropriate magnetic characteristics make studied materials suitable for magnetic resonance imaging applications.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 860-862
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Absorption Spectroscopy
Autorzy:
Mobilio, S.
Powiązania:
https://bibliotekanauki.pl/articles/1931690.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.+n
78.70.Dm
Opis:
X-ray absorption spectroscopy, today widely used as a tool for structural investigations, is described. Theoretically it is shown that above an absorption edge the absorption coefficient is well approximated by a sum of terms, each one describing a particular path followed by the photoelectron outgoing from the atom. Such geometrical feature allows to use X-ray absorption spectroscopy for structural investigations. The data analysis procedures are outlined. Applications of the single scattering region, generally known as EXAFS to semiconductors alloys, to metallic clusters and to the crystallization of amorphous metallic glasses are illustrated. Multiple scattering calculations and their relation to experimental spectra is discussed in the case of Mn ions in solution. Application of the multiple scattering to determine the three-body correlation function in a-Si:H is shown.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 645-661
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Noise Effect on Thin Film Characterization Using Rotating Polarizer Analyzer Ellipsometer
Autorzy:
El-Agez, T.
Taya, S.
Powiązania:
https://bibliotekanauki.pl/articles/1419661.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.60.Fs
78.66.Bz
78.20.Ci
Opis:
We present theoretically the characterization of 100 nm $SiO_2$ thin film using spectroscopic rotating polarizer analyzer ellipsometer in which the two elements are rotating synchronously in opposite directions with the same angular speed. The proposed sample consists of air (ambient)/$SiO_2$ (thin film)/Si (substrate). The ellipsometric parameters ψ and Δ are calculated when a clean signal is received by the detector and when a hypothetical noise is imposed on this signal. The film thickness and the optical constants of the film are calculated for the noisy signal in the spectrum range 200-800 nm. The results are compared with the proposed thickness and with the published values for $SiO_2$ optical constants.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 15-19
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Properties of Nanostructured Fe-Doped SnO₂
Autorzy:
Saleh, S.
Ibrahim, A.
Mohamed, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398977.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
61.05.C-
78.20.-e
Opis:
Nanocrystalline $Sn_{1-x}Fe_xO_2$ (where x = 0, 0.01, 0.02, 0.03 and 0.04) powders have been successfully synthesized by the hydrothermal method followed by sintering at 1000°C for 3 h. The morphology and structure of the samples have been analyzed by field emission scanning electron microscope and X-ray diffraction, respectively. X-ray diffraction results revealed that all diffraction peaks positions agree well with the reflection of a tetragonal rutile structure of SnO₂ phase without extra peaks. The formation of a tetragonal rutile structure of SnO₂ nanostructures was further supported by the Raman spectra. The band gap of Fe-doped SnO₂ nanoparticles was estimated from the diffuse reflectance spectra using the Kubelka-Munk function and it was decreasing slightly with the increase of Fe ion concentration from 3.59 to 3.52 eV. The variation in band gap is attributed predominantly to the lattice strain and particle size. The presence of chemical bonding was confirmed by the Fourier transform infrared spectra.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1220-1225
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of Painting Layers of Sennefer Tomb by Ion Beam Analysis
Autorzy:
Abd El Aal, S.
Powiązania:
https://bibliotekanauki.pl/articles/1504061.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.En
07.60.Pb
Opis:
Egypt has many pharaonic tombs for kings, queens and noblemen. The Sennefer tomb, one of the most important nobleman tombs, is located in the southern hillside of Sheikh Abd El-Qurna - west side of Luxor. It is dated back to 1439-1413 B.C. (18th Dynasty) and is usually referred as the Tomb of Vines, due to the large part of the ceiling of the burial chamber. The vine tomb was carved inside a mountain, its walls are covered with plaster and were painted using the tempera technique (pigments mixed with organic binding medium). The analysis was performed by using particle-induced X-ray emission, microbeam particle-induced X-ray emission and optical microscope for the six samples from the Vine tomb such as white, black, red, yellow, blue and green pigments and for the ground layers of the tomb in order to identify the composition of plaster layers and pigments. The data about the nature of these materials are indispensable for conservation and cleaning.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 144-148
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Growth Break before Capping on Photoluminescence Dynamics of CdSe/ZnSe Self-Assembled Quantum Dots
Autorzy:
Nowak, S.
Suffczyński, J.
Goryca, M.
Kossacki, P.
Gaj, J.
Lee, S.
Furdyna, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811967.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.67.Hc
81.07.Ta
Opis:
Influence of growth breaks before capping of CdSe self-assembled quantum dot layers on photoluminescence dynamics was examined in three samples. Short (5s) break resulted only in a small blue shift, caused probably by partial strain relaxation and/or Zn interdiffusion. Long (20 min) break induced a strong broadening and red shift of the spectra, combined with a dramatic slow down of the photoluminescence decays. The main result of the long break was identified as introduction of defects (impurities), which generate local electric fields and act as traps of photogenerated carriers.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1267-1271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation, Study and Nanoscale Growth of Indium Oxide Thin Films
Autorzy:
Bagheri Khatibani, A.
Rozati, S.
Bargbidi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1419908.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
78.66.-w
Opis:
Indium oxide $(In_2O_3)$ thin films were deposited on glass substrate by varying substrate temperature in the range of 400-600C using the spray pyrolysis technique. In this research, physical properties of indium oxide thin films were studied and then nanocrystalline sizes at different substrate temperature were deeply compared and investigated. All films were characterized at room temperature using X-ray diffraction, scanning electron microscopy, atomic force microscopy, photoluminescence, the Hall effect and UV-visible spectrophotometer. The optimal substrate temperature to obtain films of high crystallographic quality was 575°C, for this temperature, the electrical resistivity was in the order of ρ=0.147 Ω cm. For comparing optical transmittance and electrical conductivity the best figure of merit of the films was achieved at 575C.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 220-223
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of Y-Ba-Cu-O Nanowires and Nanotubes by Electrochemical Method
Autorzy:
Kaya, H.
Atalay, F.
Avsar, D.
Yagmur, V.
Atalay, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399690.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Gf
81.07.De
81.15.Pq
74.78.-w
Opis:
In this work, the technological aspects of great importance $YBa_2Cu_3O_{7-x}$ superconducting materials were produced in the form of nanotube by electrochemical method. The electrochemical deposition conditions for the Y-Ba-Cu deposition in nanoporous $Al_2O_3$ were investigated. The heat treatment was applied to $Y-Ba-Cu//Al_2O_3$ nanopatterns, to form superconductive phase. The resulting nanostructures were found to be in length 4-5 μm, 177-210 nm in diameter. The produced nanostructures at - 4 V and more positive potentials were Y-Ba-Cu nanowires, while the nanostructures deposited at the more negative potentials were of nanotube form.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 209-211
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZnO Nanopowders by a Microwave Hydrothermal Method - Influence of the Precursor Type on Grain Sizes
Autorzy:
Wolska, E.
Witkowski, B. S.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2048108.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.-n
61.43.Gt
81.07.Wx
78.55.Et
Opis:
Two series of ZnO nanopowders obtained by a microwave hydrothermal method are examined. We used two different zinc precursors (zinc chloride (ZnCl$\text{}_{2}$) and zinc nitrate hexahydrate (N$\text{}_{2}$O$\text{}_{6}$Zn·6H$\text{}_{2}$O)). Both types of nanopowders show a bright emission in a visible light, including the band edge emission, which indicates their good crystallographic quality. Results of scanning electron microscopy, photo- and cathodoluminescence investigations are presented.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 683-685
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Characterization of GaN/AlGaN Single Quantum Disk Nanorods
Autorzy:
Almokhtar, M.
Emura, S.
Tambo, H.
Hasegawa, S.
Asahi, H.
Powiązania:
https://bibliotekanauki.pl/articles/1400040.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Km
78.67.De
81.07.Vb
Opis:
GaN/AlGaN single quantum disks on GaN nanorods were grown on Si (001) substrate with native $SiO_2$ layer by a plasma-assisted molecular-beam epitaxy under nitrogen-rich conditions. The transmission electron microscopy observations show single GaN nanorods images with an average thickness of 4 nm for the GaN single quantum disk and nanorod diameter of 15 nm. The observed photoluminescence spectra at 8 K show a peak at 3.475 eV, attributed to an exciton recombination in GaN. A strong peak was observed at 3.542 eV. This peak is attributed to the quantum confinement of excitons in the GaN quantum disks.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 473-475
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and Characterization of ZnO Nanoparticles
Autorzy:
Tomaszewska-Grzęda, A.
Łojkowski, W.
Godlewski, M.
Yatsunenko, S.
Drozdowicz-Tomsia, K.
Goldys, E. M.
Phillips, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/2044547.pdf
Data publikacji:
2005-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
68.37.Hk
78.55.Et
78.47.+p
Opis:
In this work we evaluate structural and optical properties of ZnO nanoparticles grown by wet chemistry method. Light emission properties of these nanoparticles are studied with cathodoluminescence and micro-photoluminescence. Even at the room temperature excitonic emission is well resolved, due to high exciton binding energy of ZnO. Decay kinetics of photoluminescence emissions and efficiency of inter-nanoparticles energy migration is evaluated from maps of in-plane variations of photoluminescence decay times measured in microphotoluminescence setup.
Źródło:
Acta Physica Polonica A; 2005, 108, 5; 897-902
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manipulation of ZnO/Polymer Nanocomposites Generated by Nanosecond Laser Ablation in Organic Liquid
Autorzy:
Faramarzi, S.
Bajelan, S.
Akbarian, H.
Powiązania:
https://bibliotekanauki.pl/articles/1400413.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.35.Np
79.20.Eb
78.67.Bf
07.60.Rd
Opis:
We present experimental results on the production of ZnO nanoparticles with second harmonic of pulsed nanosecond Nd:YAG laser (λ=532 nm, pulse duration=5 ns) in tetrahydrofuran with 0.0 wt% and 0.8 wt% concentrations of polystyrene by high (200 mJ pulse energy) and moderate (80 mJ pulse energy) pulse energies. The produced colloids were characterized by ultraviolet-visible absorption, transmission electron microscopy, room temperature photoluminescence emission and dynamic light scattering. The mean size of nanoparticles decreased from 40 nm to 22 nm by adding polymer (0.8 wt%) and increasing the pulse energy. The colloidal nanocomposites showed a shoulder at 360 nm in ultraviolet-visible absorption spectra and were found very stable for one month. We observed two photoluminescence emission peaks in UV region at 380 nm and 400 nm attributed to exciton transition. Dynamic light scattering indicated that the size and aggregation of nanocomposites were controlled by polymer concentration and pulse energy.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 152-155
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of La-Doped $TiO_2$ Nanopowders by Raman Spectroscopy
Autorzy:
Šćepanović, M.
Aškrabić, S.
Berec, V.
Golubović, A.
Dohčević-Mitrović, Z.
Kremenović, A.
Popović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1808047.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
81.07.Wx
78.30.-j
07.05.Tp
Opis:
Titanium dioxide $(TiO_2)$ nanopowders doped with 0.65, 1, 2, 3 and 4 wt.% of lanthanum ions $(La^{3+})$ were synthesized by sol-gel technology. Dependence of structural and morphological characteristics of nanopowders on $La^{3+}$ content and synthesis conditions is investigated by the Raman spectroscopy. Very intensive modes observed in the Raman spectra of all nanopowder samples are assigned to anatase phase of $TiO_2$. Additional Raman modes of extremely low intensity can be related to the presence of certain amount of highly disordered brookite phase in nanopowders. Dependence of the intensity ratio of the Raman modes which originate from anatase and brookite on doping conditions is specially analyzed. In order to estimate the variation of nanocrystallite size with dopant content, shift and asymmetrical broadening of the most intensive $E_g$ Raman mode of anatase are analyzed by phonon confinement model. The obtained results are compared with the results of X-ray diffraction spectroscopy. Special attention is dedicated to the changes in the Raman spectra of pure and La-doped $TiO_2$ nanopowders observed after high temperature treatment.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 771-774
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 45

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