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Tytuł:
$SiO_x$ Nanowires Produced on Molybdenum-Coated Si Substrates
Autorzy:
Kim, H.
Lee, J.
Yang, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813396.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
78.55.-m
Opis:
We synthesized $SiO_x$ nanowires with diameters of 30-140 nm, for the first time by the simple heating of the Mo-coated Si substrates. X-ray diffraction, selected area electron diffraction, and energy-dispersive X-ray spectroscopy indicated that the nanowires were in an amorphous state, comprising Si and O only. Fitting the photoluminescence spectrum with Gaussian functions revealed that the nanowires exhibited significant photoluminescence intensities near blue and green light regions. We extensively discussed the possible growth mechanism of $SiO_x$ nanowires.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1017-1020
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AFM Investigation of Biological Nanostructures
Autorzy:
Strzelecki, J.
Dąbrowski, M.
Strzelecka, J.
Tszydel, M.
Mikulska, K.
Nowak, W.
Balter, A.
Powiązania:
https://bibliotekanauki.pl/articles/1419535.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.Dz
81.07.-b
Opis:
Nanostructures created by living organisms, optimized through millions of years of evolution, can be a valuable inspiration for nanotechnology. We employ atomic force microscopy to examine such structures in materials created by common organisms - caddisfly and diatoms. Caddisfly larvae are well known for their ability to spin silk, which serves as an "adhesive tape" to glue various materials and collect food in aqueous environment. Atomic force microscopy imaging of caddisfly silk, performed for the first time by our team, has shown that its surface is patterned with 150 nm extensions - a feature related to its exceptional underwater sticking abilities. Results of force spectroscopy of protein structures found on the surface are also shown. A characteristic feature of diatoms is that they are encased within a unique silica cell wall called frustules, patterned with 200 nm pores, which allow cellular interaction with the environment. We perform atomic force microscopy imaging of frustules in living diatoms as well as adhesion measurements inside pores.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 329-332
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AFM/STM Modification of Thin Sb Films on 6H-SiC(0001)
Autorzy:
Mazur, P.
Zuber, S.
Grodzicki, M.
Ciszewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1195467.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Dz
68.37.Ps
68.37.Ef
68.37.-d
81.10.Bk
81.07.-b
Opis:
Atomic force microscopy and scanning tunneling microscopy have been used for nanometer scale modifications of Sb films deposited on 6H-SiC(0001) surface. The films are grown in situ by vapor deposition under ultrahigh vacuum. The growth follows the Volmer-Weber mode. Ultrathin (up to 3 nm on average) Sb films which consist of no coalesced islands can be modified by moving the island over the substrate surface by the AFM tip. Thicker films, which are firmer due to the coalescence, can be modified by the field and/or current produced by STM tip. Final result of the modifications is adsorbate free 6H-SiC(0001) surface restitution over the modified area.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1131-1133
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antibacterial Properties of Sol-Gel Derived TiO₂ Nanoparticles
Autorzy:
Duymaz, B.
Yigit, Z.
Şeker, M.
Dündar, F.
Powiązania:
https://bibliotekanauki.pl/articles/1398802.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.56.Lz
81.20.Fw
87.19.xb
81.07.-b
Opis:
Efficient synthesis of antibacterial and antifungal titanium dioxide nano powders offers new advanced properties and opportunities for industrial applications. In the present study, TiO₂ nano particles were synthesized by sol-gel method using aqueous and alcoholic solutions of titanium tetraisopropoxide (TTIP). The effects of solvent type, support material (calcite, talk, zinc borate, silica) and drying temperature on antibacterial/antifungal and structural properties namely the average particle size and surface area of titania particles were investigated.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 872-874
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon Nanomaterials from Carbon Monoxide Using Nickel and Cobalt Catalysts
Autorzy:
Liszka, B.
Krztoń, A.
Pawlyta, M.
Powiązania:
https://bibliotekanauki.pl/articles/1536422.pdf
Data publikacji:
2010-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
Opis:
Two catalysts, nickel and cobalt, supported on MgO were used for carbon nanomaterials deposition by CO disproportionation. The syntheses were performed at 795 and 900 K in the hydrogen atmosphere. The resulting products were investigated using atomic force microscopy, scanning electron microscopy, and high-resolution transmission electron microscopy. Although in the literature carbon nanofibres are expected to form in the hydrogen presence, we obtained carbon nanotubes, which were multiwall and twisted with the outer diameter of 10-120 nm and the tube length up to 10 μm.
Źródło:
Acta Physica Polonica A; 2010, 118, 3; 471-474
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Catalyst-Free Growth of Magnesium Oxide Whiskers and Their Characteristics
Autorzy:
Kim, H.
Kong, M.
Yang, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813397.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
78.55.-m
Opis:
This study reports the production of magnesium oxide (MgO) whiskers on silicon (Si) substrates by the thermal heating of $MgB_2$ powders. We investigated the structural properties of the as-synthesized whiskers by using X-ray diffraction, transmission electron microscopy, selected area electron diffraction, and scanning electron microscopy. The product consisted of one-dimensional whiskers with a square cross-section. The whiskers had a single-crystalline cubic structure of MgO. The photoluminescence measurement with the Gaussian fitting exhibited visible light emission bands centered at 2.39 eV and 2.91 eV. We proposed the growth of MgO whiskers to follow the vapor-solid mechanism.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1021-1024
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristic properties of Dy-Eu-Ce Co-doped ZrO₂ nanofibers fabricated via electrospinning
Autorzy:
Çıçek Bezır, N.
Evcın, A.
Kayali, R.
Kaşikçi Özen, M.
Esen, K.
Cambaz, E.
Powiązania:
https://bibliotekanauki.pl/articles/1070411.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
81.07.Gf
Opis:
Zirconium oxide (ZrO₂) is one of the widely studied oxide materials because of its excellent electrical, mechanical and optical properties. In this study, undoped and Dy-Eu-Ce co-doped ZrO₂ nanofibers were fabricated by electrospinning method and their crystal structure, surface morphology, optical properties, electrical and electronic properties, and chemical properties have been analyzed using X-ray diffraction, scanning electron microscope (SEM), UV/VIS spectrometer, four point probe technique (FPPT) energy dispersive X-ray (EDX) measurements, respectively.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 300-303
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Magnetosomes After Exposure to the Effect of the Sonication and Ultracentrifugation
Autorzy:
Molčan, M.
Hashim, A.
Kováč, J.
Rajňák, M.
Kopčanský, P.
Makowski, M.
Gojzewski, H.
Molokáč, M.
Hvizdák, L.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1368025.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
75.60.-d
87.50.Y-
68.37.-d
Opis:
Magnetosomes are intracellular organelles of widespread aquatic microorganisms called Magnetotactic bacteria. At present they are under investigation especially in biomedical applications. This ability depends on the presence of intracellular magnetosomes which are composed of two parts: first, nanometer-sized magnetite $(Fe_{3}O_{4})$ or greigite $(Fe_{3}S_{4})$ crystals (magnetosome crystal), depending on the bacterial species; and second, the bilayer membrane surrounding the crystal (magnetosome membrane). The magnetosomes were prepared by biomineralization process of magnetotactic bacteria Magnetospirillum Magnetotacticum sp. AMB-1. The isolated magnetosome chains (sample M) were centrifugated at speed of 100000 rpm for 4 hours (sample UM) and sonicated at power of 120 W for 3 hours (sample SM), respectively. The prepared suspensions were investigated with respect to morphological, structural and magnetic properties. The results from scanning electron microscopy showed that isolated chains of magnetosomes were partially broken to smaller ones after ultracentrifugation. On the other hand the application of the sonication process caused the formation of individual magnetosomes (unordered in chain). These results were confirmed by coercivity and magnetization saturation measurements.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 198-199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of ZnSe Nanolayers by Spectroscopic Ellipsometry
Autorzy:
Šćepanović, M.
Grujić-Brojčin, M.
Nesheva, D.
Levi, Z.
Bineva, I.
Popović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1795712.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
81.15.-z
81.05.Dz
78.30.-j
07.60.Fs
68.55.-a
Opis:
Single layers of ZnSe with thicknesses of 30, 40, 50, 70 and 100 nm are deposited at room substrate temperature by thermal evaporation of ZnSe powder in vacuum. The layers surface morphology has been investigated by atomic force microscopy. Structural characterization by the Raman scattering measurement revealed the existence of randomly oriented crystalline ZnSe particles in all layers, and the presence of amorphous phase in layers thinner than 100 nm. The ellipsometric measurements were performed in the range from 1.5 to 5 eV at room temperature in air. To interpret the experimental results, the Bruggeman effective medium approximation of dielectric function of ZnSe layers has been used, representing the layers as different mixtures of crystalline ZnSe (c-ZnSe), amorphous ZnSe (a-ZnSe), and voids. The assumption of polycrystalline ZnSe layers modeled as mixture of porous c-ZnSe (with volume fraction of voids ≈ 0.17) and a-ZnSe gives the best fit of ellipsometric experimental data. Single layer thicknesses similar to those expected from preparation conditions have been obtained by this fitting procedure. It has been also found that decrease in the layer thickness causes an increase of the volume fraction of a-ZnSe. Thus, c-ZnSe/a-ZnSe ratio, porosity and layer thickness obtained by spectroscopic ellipsometry, provides useful information about crystallinity and micro-/nanostructure of ZnSe nanolayers.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 708-711
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Antibacterial Properties of Nano $TiO_2$ and ZnO Particle Filled Polymers
Autorzy:
Altan, M.
Yildirim, H.
Powiązania:
https://bibliotekanauki.pl/articles/1293839.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.35.Np
81.07.-b
Opis:
Antibacterial property for the plastic products is very important due to their wide spread usage in many areas close to human health such as a child toy or a food package. There are some methods to make polymers antibacterial such as ionizing radiation but they can be still infected by micro organisms during usage of them. The best and easy way to obtain antibacterial polymers is melt mixing of polymers with antibacterial agents. In this study, nano $TiO_2$ and ZnO particles were mixed with polypropylene and high density polyethylene with a twin screw extruder. Silane was applied to the particles prior melt mixing in order to prevent agglomeration and FT-IR analysis was done to characterize the particles. After melt mixing, particle filled rectangular plates were obtained by plastic injection molding and antibacterial tests were done on the plates according to a standard method, JIS Z 2801. According to the results, satisfactory antibacterial properties were obtained for both polymers and it has been seen that particles without silane could not provide antibacterial effect.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 645-647
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the Fe and Pt Nanoparticles with FePt Alloy Prepared by Polyol Process: Shape and Composition Study
Autorzy:
Farahmandjou, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399780.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.16.Dn
81.16.Be
81.07.-b
78.67.Bf
Opis:
In this study, Fe and Pt nanoparticles are first synthesized by decomposition of iron(II) chloride tetrahydrate and reduction of platinum(II) acetylacetonate. Then, FePt nanoparticles are similarly fabricated by adding LiBEt3H to the phenyl ether solution in the presence of oleic acid, oleylamine surfactant at 100°C, followed by refluxing at 255°C. The samples were characterized by transmission electron microscopy and energy dispersive spectroscopy analyses after heat treatments. Transmission electron microscopy images show that self-assembled 8 nm Fe nanoparticles are formed as polygon shape, whereas Pt nanoparticles have broad size distribution. On the other hand, 4.5 nm FePt nanoparticles have standard division about 9%. The results of energy dispersive spectroscopy analysis reveal that the composition of Pt, Fe and FePt nanoparticles gives $Fe_{56}Pt_{44}$ stoichiometry.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 277-278
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions for Conductance Quantization in Mesoscopic Dirac Systems on the Examples of Graphene Nanoconstrictions
Autorzy:
Rut, G.
Rycerz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1374093.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.-b
72.80.Vp
81.07.Vb
Opis:
Ballistic transport through an impurity-free section of the Corbino disk in graphene is investigated by means of the Landauer-Büttiker formalism in the mesoscopic limit. In the linear-response regime the conductance is quantized in steps close to integer multiples of 4e²/h, yet Fabry-Perot oscillations are strongly suppressed. The quantization arises for small opening angles θ ≲ π/3 and large radii ratios $R_2$/$R_1$ ≳ 10. We find that the condition for emergence of the n-th conductance step can be written as √nθ/π ≪ 1. A brief comparison with the conductance spectra of graphene nanoribbons with parallel edges is also provided.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-114-A-117
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Confinement Anisotropy on Excitonic Properties in InAs/InP Quantum Dashes
Autorzy:
Mrowiński, P.
Musiał, A.
Sęk, G.
Misiewicz, J.
Höfling, S.
Somers, A.
Hein, S.
Forchel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399087.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
71.70.Gm
78.67.Hc
73.21.-b
81.07.Ta
Opis:
The influence of confinement potential anisotropy on emission properties of strongly elongated single InAs/InGaAlAs/InP quantum dashes has been investigated by polarization-resolved microphotoluminescence spectroscopy at around 1.5 μm. There have been determined the exciton fine structure splitting, degree of linear polarization of surface emission and biexciton binding energy. The investigated dashes exhibited usually: the exciton anisotropy splitting larger than 100 μeV, the corresponding biexciton binding energy of about 3 meV, and the degree of linear polarization values in the range from 24% to 55%. Here, we presented a correlation of these parameters for several quantum dashes, which can be attributed either to a change in lateral aspect ratio within the ensemble, or the carrier localization on random fluctuations of the dash confinement potential.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 801-804
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Layer Thickness on I-V Characteristics of GaInP Nanofibers Fabricated by Electrospinning on n-Si Substrates
Autorzy:
Çiçek Bezir, N.
Evcin, A.
Okçu, H.
Kayali, R.
Kaleli, M.
Aldemir, D.
Powiązania:
https://bibliotekanauki.pl/articles/1031924.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
73.61.Le
81.07.Gf
Opis:
GaInP nanofibers were formed on n-Si substrates by electrospinning method, using constant voltage (25 kV), height (6 cm), and flow rate (0.3 ml/h) during various process times (of 10, 20, 25 minutes). Characterization of the prepared samples was performed by X-ray diffraction, differential scanning calorimetry/thermal gravimetric analysis, scanning electron microscopy, and energy dispersive X-ray spectrometry. Furthermore, the current-voltage measurements of the GaInP/n-Si samples have been carried out. The obtained results show that I-V characteristics of all GaInP/n-Si samples fabricated with three thicknesses of GaInP layers are rather in a good agreement with the theory and that they exhibit rectifying properties.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 638-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Particle Impact Angle, Erodent Particle Size and Acceleration Pressure on the Solid Particle Erosion Behavior of 3003 Aluminum Alloy
Autorzy:
Yıldıran, Y.
Avcu, E.
Şahin, A.
Fidan, S.
Yetiştiren, H.
Sınmazçelik, T.
Powiązania:
https://bibliotekanauki.pl/articles/1195082.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.70.-q
68.35.B-
68.35.-p
42.79.Ls
68.37.Hk
07.85.Nc
Opis:
This study aims to examine solid particle erosion behavior of 3003 aluminum alloy. 3003 aluminum alloy samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45° and 60°) and acceleration pressures (1.5, 3 and 4 bar) by using 80 mesh and 180 mesh sized erodent particles (garnet). The erosion rates of aluminum alloy samples were calculated depending on the erosion parameters. The erosion rates of the samples have varied dramatically depending on particle impingement angle, acceleration pressure and erodent particle size. The maximum erosion rates were observed at 15° impingement angles at all acceleration pressures and particle sizes. Moreover, erosion rates of the samples were increased with increases in acceleration pressure at all particle impingement angles and particle sizes. On the other hand, erosion rates of the samples decrease with increase in erodent particle sizes. Hence, maximum erosion was observed when the aluminum alloy eroded at 15° impingement angle and 4 bar pressure by using 180 mesh erodent particles. Finally, the eroded surfaces of the samples were analyzed by using scanning electron microscope. The surfaces of the samples were also investigated by using energy dispersive X-ray analysis in scanning electron microscopy studies. Microcutting and microploughing erosion mechanisms were observed at 15° and 30° impingement angles, while deep cavities and valleys formed due to plastic deformation were observed at 45° and 60° impingement angles. Moreover, embedded erodent particles were clearly detected on the surfaces of the samples by energy dispersive X-ray analysis.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 523-525
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 86

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