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    Wyświetlanie 1-8 z 8
    Tytuł:
    FMR Evidence of Stable Ferromagnetic Correlations at Zigzag Edge States in Graphene
    Autorzy:
    Augustyniak-Jabłokow, M.
    Maćkowiak, M.
    Tadyszak, K.
    Strzelczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386999.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.50.+g
    68.65.Pq
    Opis:
    We studied magnetic properties of a composite of paraffin and graphene flakes. Magnetic properties of this composite were investigated by ferromagnetic resonance/electron spin resonance technique. The ferromagnetic resonance signal from graphene suspension in paraffin is broad and shifted from magnetic field corresponding to g ≈ 2 to the low magnetic field. The temperature dependence of the spectra shows that magnetic ordering in the studied system is sensitive to thermal fluctuations. These features are expected for the 1D ferromagnetism and the obtained results are analyzed in the frame of the theoretical predictions concerning magnetic correlations at graphene edges. Therefore, based on our investigation we can conclude the existence of the magnetic edges in graphene and presence of the ferromagnetic correlations between edge spins.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 537-539
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Morphological Analysis of Graphene on Copper Substrate obtained by CVD from a Liquid Precursor
    Autorzy:
    Weiss, M.
    Walkowiak, M.
    Wasiński, K.
    Półrolniczak, P.
    Kokocińska, B.
    Strupiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032380.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.Pq
    81.05.ue
    Opis:
    Graphene film has been produced on untreated Cu substrate by a chemical vapor deposition technique in ambient pressure with liquid ethanol serving as the carbon precursor. The obtained material has been subjected to morphological study, directly on Cu substrate, by means of optical microscopy, scanning electron microscopy, atomic force microscopy, and a detailed Raman analysis. As a benchmark material, graphene obtained on Cu by a conventional CVD from gaseous methane was used. This simple experimental setup has proved to enable obtaining large area graphene samples with nearly 100% substrate coverage and large domains of one carbon layer. As compared to graphene from gaseous precursor, the presented approach resulted in visibly more defects and impurities. These imperfections are due to more complex precursor molecular structure and lack of Cu pretreatment with hydrogen, the later cause being easy to eliminate in course of further optimization of the method. The described approach can be regarded as a viable, low-cost, and experimentally simple alternative for the existing techniques of producing large area graphene. By providing direct comparison with the conventional method, the paper's intention is to provide deeper insight and to fill gap in the understanding of mechanisms involved in graphene formation on copper.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1497-1506
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Graphene Based Flow Sensors
    Autorzy:
    Kaźmierczak, P.
    Binder, J.
    Boryczko, K.
    Ciuk, T.
    Strupiński, W.
    Stępniewski, R.
    Wysmołek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195452.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.Pq
    72.80.Vp
    73.30.+y
    Opis:
    We report on attempts to produce a graphene based liquid flow sensor. Our results indicate that modifications of the electric double layer, formed in the vicinity of the graphene surface, dominate over mechanisms responsible for liquid flow-induced voltage/current generation. Several graphene structures were tested in different measurement configurations, aimed to maximize the generated signal amplitude and its stability. Some realizations of working devices in water as well as in aqueous solutions of NaCl or HCl are presented.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1209-1211
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In Situ Raman Spectroscopy of Solution-Gated Graphene on Copper
    Autorzy:
    Binder, J.
    Stępniewski, R.
    Strupiński, W.
    Wysmołek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033795.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.Pq
    78.67.Wj
    73.30.+y
    Opis:
    We present a solution-gated in situ Raman spectroscopy approach, which enables the electrical characterization of graphene on a copper substrate without the need of a transfer process. The application of a voltage across the solution resulted in a shift of the Raman G-band without a significant shift of the 2D band. This observation allowed for the separation of the effects of strain and doping. Based on the G and 2D band shifts we show that we can manipulate the n-type carrier concentration of graphene directly on the copper substrate in a range from about 8× 10¹² cm¯² to about 1.5× 10¹³ cm¯².
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 360-363
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic Waves Absorption by Graphene-Magnetic Semiconductor Multilayered Nanostructure in External Magnetic Field: Voight Geometry
    Autorzy:
    Kuzmin, D.
    Bychkov, I.
    Shavrov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386985.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Jb
    42.25.Bs
    68.65.Ac
    68.65.Cd
    68.65.Pq
    Opis:
    Absorption of electromagnetic waves by graphene-magnetic semiconductor multilayered structure has been investigated for the Voight geometry with taking into account the dissipation processes. The possibility of control of electrodynamic properties of the structure by an external magnetic field, changing in number of periods of the structure, chemical potential of the graphene layers and temperature has been shown. Electrodynamics of the structure is also sensitive to polarization of the incident wave. The structure shows to be especially controllable at terahertz frequencies.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 528-530
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reciprocating Wear Behavior of Ductile Cast Iron Modified by Pulse Plasma Technology
    Autorzy:
    Ayday, A.
    Durman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207532.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.-b
    68.35.bd
    81.40.Pq
    Opis:
    Wear resistance of ductile iron can be improved through different surface engineering techniques, each having some limitations and drawbacks. Recently, a new method called pulse plasma technology has been introduced, which through local reinforcement with inserts improves wear resistance of ductile iron without compromising other properties. This paper deals with the improvement of the wear resistance of ductile iron surface modified by pulse plasma technology using a tungsten electrode. The surfaces of the samples were treated by $C_3H_8$, air, and oxygen gases. The surface morphology and the phase structure in the near surface region of original and treated samples were analyzed with optic microscope, scanning electron microscope and energy-dispersive spectroscopy. The surface properties were evaluated by measuring the microhardness, wear properties and friction coefficient, as well as the elemental depth profiles and chemical composition of the modified layer. It was found that the microhardness of the treated samples was much higher. The tribological resistances were also significantly improved, as confirmed by the reduced friction coefficient and wear track width. This improvement can be attributed to the diffusion of tungsten on the surface layer.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 189-191
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion resistance of tin coatings deposited by different methods
    Autorzy:
    Winnicki, M.
    Rutkowska-Gorczyca, M.
    Baszczuk, A.
    Małachowska, A.
    Piwowarczyk, T.
    Ambroziak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1154007.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    68.35.bd
    81.15.Pq
    81.15.Rs
    81.65.Kn
    Opis:
    This article describes the study of corrosion resistance of tin coatings deposited onto aluminum alloy substrates using the low pressure cold spraying and electroplating methods. The chemical corrosion resistance was examined using the Kesternich and cyclic salt spray tests inside SO₂ and NaCl climate chambers, respectively. The selected tests allowed simulation of the conditions of the coatings during service. The results were satisfactory for low pressure cold spraying coatings. Coatings produced by electroplating exhibit substantial corrosive losses due to their method of application and low thickness. Evaluation of corrosion were carried out by analyzing changes in the microstructure. Additionally, the physicochemical tests were carried out using X-ray diffraction to verify corrosion changes on the coatings surface.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1155-1157
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Composition of the Surface Zone of Nitrided Cast Steels and Their Mechanical Properties
    Autorzy:
    Brzózka, K.
    Budzynowski, T.
    Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506569.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    81.65.Lp
    81.40.-z
    76.80.+y
    61.05.cp
    68.37.-d
    81.40.Pq
    Opis:
    Conversion electron Mössbauer spectroscopy and structural X-ray diffractometry have been used to study nitrides formation in the surface layer of cast steels subjected previously to low-temperature nitriding. It has been found that creation of iron-nitrogen phases strongly depends on sample composition. Nitrides: $γ^\prime-Fe_{4}N$ and $\epsilon-Fe_{2-3}N$ arise in the course of the nitriding procedure in most investigated cast steels. Moreover, considerable changes in their microstructure and tribological properties occur. The depth profile of nitrides has been derived for selected cast steel.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 28-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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