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Wyszukujesz frazę "Maciak, T." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-7 z 7
    Tytuł:
    SAW sensor for detection of hydrocarbons. Numerical analysis and experimental results
    Autorzy:
    Hejczyk, T.
    Urbańczyk, M.
    Wituła, R.
    Maciak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/201623.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SAW
    gas sensor
    piezoelectric substrate
    Ingebrigtsen's formula
    impedance transformation law
    numerical modeling
    Opis:
    The paper presents the results of numerical analyses of the SAW gas sensor in the steady and non-steady state. The effect of SAW velocity changes vs. the surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. Knudsen's model of gas diffusion was used. Numerical results for the gases CH4, C2H4, C3H8, C6H6 in the steady state and CH4 in the non-steady state in the WO3 sensing layer have been shown. The results of numerical analyzes allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness and operating temperature. Some numerical results were verified in experimental studies concerning methane.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 589-595
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Layered thin film nanostructures of Pd/WO3-x as resistance gas sensors
    Autorzy:
    Urbańczyk, M.
    Maciak, E.
    Gut, K.
    Pustelny, T.
    Jakubik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200121.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tungsten trioxide
    palladium
    layered nanostructure
    resistance sensor
    nitrogen dioxide
    ammonia
    Opis:
    Layered nanostructures of tungsten trioxide WO3-x about 62 nm thick, with a very thin film of palladium (about 3.3 nm) on the top, have been studied for gas-sensing application at temperatures 50.C and 120.130.C and low NO2 and NH3 concentrations in 6%, 30% or 45% relative humidity in the air. Thin film WO3-x nanostructures were obtained by vacuum deposition on a common Si-SiO2 substrate at room temperature and 120.C. The palladium was coated by vacuum evaporation at room temperature and 4 �E 10.6 mbar on WO3-x layers obtained at two different substrate temperatures. The average rate of growth of the films, controlled by a QCM, was 0.1.0.2 nm/s. A multi-channel (four-channel interdigital gold electrodes) planar resistance gas sensor structure was used in the experiments. The surface of the nanostructures was characterized by means of the AFM method. Good sensor results have been observed at these layered nanostructures with an increasing resistance for NO2 molecules and decreasing resistance for NH3 molecules in a humid air atmosphere. The interaction and recovery speed were higher in the case of the nanostructure obtained at room temperature.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 401-407
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of Sensitivity of SAW Structure to the Effect of Toxic Gases
    Autorzy:
    Hejczyk, T.
    Pustelny, T.
    Wszołek, B.
    Jakubik, W.
    Maciak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/177695.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface acoustics wave SAW
    SAW
    Ingebrigtsen’s formula
    gas diffusion equations
    gaseous acoustic sensors
    numerical analyses of SAW structures
    Opis:
    The paper presents the results of numerical analysis of the SAW gas sensor in the steady and non-steady states. The effect of SAW velocity changes vs surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. The Knudsen’s model of gas diffusion was used. Numerical results for the effect of gas CH4 on layers: WO3, TiO2, NiO, SnO2 in the steady state and CH4 in the non-steady state in recovery step in the WO3 sensing layer have been shown. The main aim of the investigation was to study thin film interaction with target gases in the SAW sensor configuration based on simple reaction-diffusion equation. The results of the numerical analysis allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness, operating temperature, and layer type. The numerical results basing on the code elaborated numerical system (written in Python language), were analysed. The theoretical results were verified and confirmed experimentally.
    Źródło:
    Archives of Acoustics; 2016, 41, 4; 747-755
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gas sensors based on nanostructures of semiconductors ZnO and TiO2
    Autorzy:
    Pustelny, T.
    Procek, M.
    Maciak, E.
    Stolarczyk, A.
    Drewniak, S.
    Urbańczyk, M.
    Setkiewicz, M.
    Gut, K.
    Opilski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/201719.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas sensors
    nanostructures
    TiO2
    ZnO
    Opis:
    The paper presents a resistance structures with sensor layers based on nanostructures elaborated on the base of TiO2 and ZnO. The structures were tested concerning their sensitivities to the effects of nitrogen dioxide in the atmosphere of synthetic air. The TiO2 and ZnO nanostructures played the role of sensor layers. Investigations have proved that the elaborated resistance structures with TiO2 and ZnO layers are sensitive to the presence of NO2 in the atmosphere of synthetic air. The resistance of the structure amounted to about 20 in the case of ZnO structures and to about 200 in the case of TiO2 structures. The investigations confirmed that resistance structures with ZnO and TiO2, exposed to the effect of nitrogen dioxide in the atmosphere of synthetic air changes their resistances relatively fast. This indicates that such structures might be practically applied in sensors of nitrogen dioxide ensuring a short time of response.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 853-859
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The sensitivity of sensor structures with oxide graphene exposed to selected gaseous atmospheres
    Autorzy:
    Pustelny, T.
    Drewniak, S.
    Setkiewicz, M.
    Maciak, E.
    Urbańczyk, M.
    Procek, M.
    Gut, K.
    Opilski, Z.
    Jagiello, J.
    Lipinska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/200229.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    graphene oxide
    gas sensors
    resistive sensors
    Opis:
    The paper presents the results of investigations on the resistive structure with a graphene oxide (GO) sensing layer. The effects of dangerous gases (hydrogen and nitrogen dioxide) on the structure were studied; the resistance changes were examined during the flow of the selected gas in the atmosphere of synthetic air. Measurements were performed with a special emphasis on the detection of low concentrations of the analyzed gases. The reactions of the sensing structure to the effect of nitrogen and synthetic air at different humidity were also tested. Much attention was also paid to the fast response of the sensor to the changes in the gas atmosphere. The thin palladium layer (~2 nm) has been applied in order to improve the sensing properties of the structure. The investigations were performed in the temperature range from RT to 120°C and the analyzed gases in synthetic air were batched alternately with pure synthetic air.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 705-710
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The sensibility of resistance sensor structures with graphene to the action of selected gaseous media
    Autorzy:
    Pustelny, T.
    Setkiewicz, M.
    Drewniak, S.
    Maciak, E.
    Stolarczyk, A.
    Urbańczyk, M.
    Procek, M.
    Gut, K.
    Opilski, Z.
    Pasternak, I.
    Strupinski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200915.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    resistance
    sensor
    hydrogen sensor
    nitrogen dioxide sensor
    Opis:
    The paper presents resistance sensor structures with a graphene sensing layer. The structures were tested concerning their sensitivity to the affects of hydrogen, nitrogen dioxide and steam in an atmosphere of a synthetic air. Investigations have proved that resistance structures with a graphene layer are sensitive to the presence of the tested gases. The resistance of the structures amounted to about 10Ω, whereas changes in the resistances affected by the external gaseous medium were contained within the range of a several mΩ. The investigations confirmed that the resistance structures with graphene exposed to the affect of hydrogen in atmosphere of synthetic air change their resistances practically at once (within the order of only a few seconds). This indicates that such structures might be practically applied in sensors of hydrogen ensuring a short time of response.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 293-300
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of changes in electrical resistance of zinc oxide nanostructures under the influence of variable gaseous environments
    Autorzy:
    Procek, M.
    Pustelny, T.
    Stolarczyk, A.
    Maciak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/201073.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc oxide
    ZnO
    flower-like nanostructures
    gas sensor
    wide gap semiconductors
    electric properties of semiconductors
    tlenek cynku
    kwiatopodobne nanostruktury
    czujnik gazu
    właściwości elektryczne półprzewodników
    Opis:
    The paper deals with the investigations concerning the influence of the changing gas environment on electrical resistance of zinc oxide (ZnO) nanostructures. The investigated structures are wide-gap semiconductors with the morphology of ZnO flower-shaped agglomerates of nanostructures. The resistance changes of these nanostructures were tested under the influence of various gases such as nitrogen dioxide (NO2), hydrogen (H2), ammonia (NH3) and also of humidity changes of carrier gases. To clarify the mechanisms of physicochemical processes in ZnO nanostructures during their interaction with gaseous environments, investigations were performed in two different carrier gases, viz. in synthetic air and in nitrogen. The study was carried out at a structure temperature of 200◦C.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 635-639
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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