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    Wyświetlanie 1-11 z 11
    Tytuł:
    Influence of Humidity on SAW Sensor Response
    Autorzy:
    Jasek, K.
    Pasternak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399358.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Pt
    46.35.+z
    68.35.Ja
    Opis:
    In the surface acoustic wave sensors response analysis the influence of different factors on acoustic wave propagation velocity and resonant frequency of the surface acoustic wave device plays an important role. Because the resonant frequency is commonly assumed to be a sensor response, knowing the magnitude of this influence and its mechanisms is very important. The factors which interfere the most with the surface acoustic wave sensor response include: temperature, pressure, and humidity. The influence of humidity is almost impossible to eliminate because of phenomena connected with water adsorption at the surface of the substrate as well as the electrodes of the device.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 448-450
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of External Pressure on Resonant Frequency of SAW Resonator
    Autorzy:
    Jasek, K.
    Pasternak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189910.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.60.-x
    43.35.Pt
    46.80.+j
    61.30.Hn
    Opis:
    The results of numerical simulations and experimental measurements of surface acoustic wave resonator centre frequency and amplitude dependence on external pressure changes in the range 0-1 atm are presented in the paper. According to the analytical model as well as numerical calculations the pressure influence on the resonator centre frequency is linear. Unfortunately, in the real measurements the linearity is difficult to observe. Additional effects that modify the linear dependence of the centre frequency on pressure are caused by water particles. It is well visible especially in the low pressure range. The phenomenon can be applied for research of water contents in dry gases as well as construction of acoustoelectronic vacuometers.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1601-1604
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SAW Sensor for Mercury Vapour Detection
    Autorzy:
    Jasek, K.
    Neffe, S.
    Pasternak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417965.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Pt
    46.35.+z
    68.35.Ja
    Opis:
    Mercury is the element commonly applied in industry. Because of poisoning properties the monitoring of the mercury vapour concentration in the environment is very important. Mercury forms amalgams in connection with gold that causes a change in the electrical resistance and mass of the gold specimens. This effect was applied to measure mercury vapour concentration in the environment using surface acoustic wave technology. Two kinds of surface acoustic wave mercury sensors have been described in the paper. First one utilizes a thin film of gold deposited between aluminium interdigital transducers and reflectors of two-port surface acoustic wave resonator, and the second one golden interdigital transducers and reflectors without any sensitive film between them.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 825-828
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New System for Acoustoelectronic Gas Sensors Analysis
    Autorzy:
    Jasek, K.
    Miluski, W.
    Pasternak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399357.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Pt
    46.35.+z
    68.35.Ja
    Opis:
    Typical approach to the surface acoustic waves sensors response analysis is based on the use of self-oscillating circuits with surface acoustic wave device working inside positive feedback loop of an amplifier. Such kind of parametric measurement allows to track the center frequency of the sensor changes in particular. The method is widely used mainly due to their relative simplicity. Unfortunately, it has many disadvantages like frequency (phase) instability, sensitivity to unwanted factors, surface acoustic wave substrate mass-load limit etc. A new system to the analysis of surface acoustic wave gas sensors response as well as an exemplary measurement results are described in the paper. The presented system make the first step to the more complex conception realization.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 445-447
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Approach to SAW Gas Sensors Array Response Measurement
    Autorzy:
    Jasek, K.
    Miluski, W.
    Pasternak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493213.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Pt
    46.35.+z
    68.35.Ja
    Opis:
    Majority papers concerning surface acoustic wave sensors technology is devoted to the analysis of self-oscillating circuits with surface acoustic wave device and its basic frequency changes in particular. Such circuits are widely used mainly due to their relative simplicity. Unfortunately the price of the simplicity is such drawbacks like frequency instability, sensitivity to unwanted factors, surface acoustic wave surface load limit etc. A new approach to the analysis of surface acoustic wave gas sensors response is proposed in the paper. The approach significantly eliminates the disadvantages of commonly used so far methods of analysis.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 639-641
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planar Optical Waveguides Based on Thin ZnO Layers
    Autorzy:
    Struk, P.
    Pustelny, T.
    Gut, K.
    Gołaszewska, K.
    Kamińska, E.
    Ekielski, M.
    Pasternak, I.
    Łusakowska, E.
    Piotrowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807757.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Hz
    42.25.-p
    42.70.-a
    42.82.-m
    42.82.Et
    68.35.Ct
    Opis:
    The paper quotes the results of investigations concerning planar optical waveguides with a high value of the refractive index, achieved basing on a broad-band gap semiconductor ZnO, deposited on glass or quartz substrates. The investigations were focused on the properties of the waveguides, determining the modal characteristics, the attenuation coefficient and the structure of the surface.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 414-418
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Electrical Studies of Graphene Deposited on GaN Nanowires
    Autorzy:
    Kierdaszuk, J.
    Kaźmierczak, P.
    Drabińska, A.
    Wysmołek, A.
    Korona, K.
    Kamińska, M.
    Pakuła, K.
    Pasternak, I.
    Krajewska, A.
    Żytkiewicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195433.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.ue
    72.10.Fk
    78.67.Wj
    72.80.Vp
    Opis:
    In this paper using scanning electron microscope, contactless microwave electronic transport and the Raman spectroscopy we studied the properties of graphene deposited on GaN nanowires and compared it with the graphene deposited on GaN epilayer. The Raman micro-mapping showed that nanowires locally change the strain and the concentration of carriers in graphene. Additionally we observed that nanowires increase the intensity of the Raman spectra by more than one order of magnitude.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1087-1089
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planar Optical Waveguides for Application in Optoelectronic Gas Sensors
    Autorzy:
    Golaszewska, K.
    Kamińska, E.
    Pustelny, T.
    Struk, P.
    Piotrowski, T.
    Piotrowska, A.
    Ekielski, M.
    Kruszka, R.
    Wzorek, M.
    Borysiewicz, M.
    Pasternak, I.
    Gut, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811559.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.82.Et
    07.07.Df
    42.79.Pw
    81.15.-z
    Opis:
    In the paper, the results of technological investigations on planar optical waveguides based on high band gap oxide semiconductors were presented. Investigations concerned the technologies of depositing very thin layers of: zinc oxide ZnO, titanium dioxide $TiO_2$ and tin dioxide $SnO_2$ on substrates of quartz glass plates. There were investigated both morphological structures of the produced layers and their optical properties. The paper also presents investigations on the technology of input-output light systems in the Bragg grating structures.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-223-A-230
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Humidity on the Resistance Structures with Graphene Sensor Layer
    Autorzy:
    Pustelny, T.
    Setkiewicz, M.
    Drewniak, S.
    Maciak, E.
    Stolarczyk, A.
    Procek, M.
    Urbańczyk, M.
    Gut, K.
    Opilski, Z.
    Pasternak, I.
    Strupinski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418032.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.07.Df
    42.81.Pa
    82.47.Rs
    Opis:
    In the paper the results of investigations are presented concerning the influence of humidity of air on the resistance of a gas sensor structure with a graphene layer. The affects of nitrogen dioxide and humidity action on graphene were studied. We indicated that humidity might play an important role in determining the gas sensing properties of the graphene layer. In the paper it has been shown that in the case of a nitrogen oxide sensor, the reaction of $NO_2$ with water vapour can generate permanent defects in graphene.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 870-873
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and Selected Properties of Core/Shell ZnTe-Based Nanowire Structures Containing ZnO
    Autorzy:
    Gas, K.
    Janik, E.
    Zaleszczyk, W.
    Pasternak, I.
    Dynowska, E.
    Fronc, K.
    Kolkovsky, V.
    Kret, S.
    Morhange, J. F.
    Reszka, A.
    Wiater, M.
    Caliebe, W.
    Karczewski, G.
    Kowalski, B. J.
    Szuszkiewicz, W.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047950.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    68.37.Lp
    68.65.La
    81.07.Vb
    Opis:
    We report on an approach to fabricate ZnTe-based core/shell radial heterostructures containing ZnO, as well as on some of their physical properties. The molecular beam epitaxy grown ZnTe nanowires constituted the core of the investigated structures and the ZnO shells were obtained by thermal oxidation of ZnTe NWs. The influence of the parameters characterizing the oxidation process on selected properties of core/shell NWs were examined. Scanning electron microscopy revealed changes of the NWs morphology for various conditions of the oxidation process. X-ray diffraction, high resolution transmission electron microscopy, and Raman scattering measurements were applied to reveal the presence of ZnTe single crystal core and polycrystalline ZnO-shell of investigated structure.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 612-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrathin NbN Films for Superconducting Single-Photon Detectors
    Autorzy:
    Słysz, W.
    Guziewicz, M.
    Borysiewicz, M.
    Domagała, J.
    Pasternak, I.
    Hejduk, K.
    Rzodkiewicz, W.
    Ratajczak, J.
    Bar, J.
    Węgrzecki, M.
    Grabiec, P.
    Grodecki, R.
    Węgrzecka, I.
    Sobolewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504147.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.62.Bf
    74.78.-w
    81.15.Cd
    81.15.Jj
    Opis:
    We present our research on fabrication and structural and transport characterization of ultrathin superconducting NbN layers deposited on both single-crystal $Al_2O_3$ and Si wafers, and $SiO_2$ and $Si_3N_4$ buffer layers grown directly on Si wafers. The thicknesses of our films varied from 6 nm to 50 nm and they were grown using reactive RF magnetron sputtering on substrates maintained at the temperature 850°C. We have performed extensive morphology characterization of our films using the X-ray diffraction method and atomic force microscopy, and related the results to the type of the substrate used for the film deposition. Our transport measurements showed that even the thinnest, 6 nm thick NbN films had the superconducting critical temperature of 10-12 K, which was increased to 14 K for thicker films.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 200-203
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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