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Wyświetlanie 1-9 z 9
Tytuł:
The Influence of Substrate on Size of Pd Nanoparticles in C-Pd Composites Obtained in the PVD and CVD Processes
Autorzy:
Sobczak, K.
Kozłowski, M.
Czerwosz, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032958.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
81.07.Bc
81.15.Gh
82.45.Mp
Opis:
This paper presents the results of research of C-Pd composite films obtained by the physical vapor deposition and chemical vapor deposition method. These films will be applied as hydrogen sensors. It has been examined whether the substrate has an impact on morphology and topologies of the C-Pd composite and whether the thermal conductivity of the substrate has an impact on the average size of the Pd nanoparticles. Substrates such as Al₂O₃, SiO₂, Si, and Mo were used, and in the physical vapor deposition process fullerene (C₆₀) and palladium acetate were deposited. Some of the samples were examined microscopically, while another part was modified in the chemical vapor deposition process in the presence of xylene. It was found that the average size of the Pd nanoparticles prepared in the physical vapor deposition process is independent of the substrate for all of the substrates used in the present experiment. During the chemical vapor deposition process an increase of the size of the Pd nanoparticles was observed - as expected. What is more, we noticed a weak relation between the size of the Pd nanoparticles and the type of substrate on which the C-Pd composite was deposited.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1413-1416
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Studies of C-Ni-Pd Nanocomposite Films Deposited on Al₂O₃ Substrate
Autorzy:
Kozłowski, M.
Czerwosz, E.
Sobczak, K.
Kurowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1032987.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
81.07.Bc
81.15.Gh
82.45.Mp
Opis:
The properties of nanocomposite carbon-nickel-palladium (C-Ni-Pd) films deposited on Al₂O₃ substrate have been investigated and the results are presented in this work. C-Ni-Pd films were obtained by a 3 step process consisting of PVD/CVD/PVD methods. The structure and morphology of the obtained films were characterized by scanning electron microscopy and transmission electron microscopy techniques at various stages of film formation. Energy dispersive X-ray spectrometer was used for measuring the elements segregation in the obtained film. Transmission electron microscopy and scanning transmission electron microscopy observations have shown carbon nanotubes decorated with palladium nanoparticles in the final film. The average size of the palladium nanoparticles did not exceed 10 nm.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1409-1412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infiuence of Hydrogen on the Properties of Nanostructured C-Pd Films for Sensing Applications
Autorzy:
Kamińska, A.
Diduszko, R.
Krawczyk, S.
Czerwosz, E.
Sobczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/778287.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
C-Pd films
hydrogen sensor
GIXD measurements
resistance changes
Opis:
In this paper we present the results of the investigations of nanostructured C-Pd films for hydrogen sensing applications. These C-Pd films were prepared by physical vapor deposition and then annealed in an argon flow at the temperature of 500°C. The structure and morphology of the prepared C-Pd films were investigated using transmission electron microscopy and energy dispersive X-ray spectroscopy. We studied the infiuence of hydrogen on the electrical properties and crystal structure of C-Pd films. It was shown that film resistance changes depended on hydrogen concentration. At lower hydrogen concentration (up to 2 vol.%), the films response increased proportionally to [H2], while above 2 vol.% H2, it was almost constant. This is connected with the formation of a solid solution of hydrogen in palladium at lower H2 concentration and the creation of palladium hydride at higher H2 concentration. X-ray diffraction was used to confirm the formation of Pd-H solid solution and palladium hydride.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 2; 77-81
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature-induced changes in the topography and morphology of C–nPd films deposited on fused silica
Autorzy:
Diduszko, R.
Kowalska, E.
Kozłowski, M.
Czerwosz, E.
Kamińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/174476.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
carbonaceous-palladium film
PVD
XRD
SEM
FTIR
Opis:
Changes in superficial and structural properties in carbonaceous–palladium (C–Pd) films prepared by PVD method, induced by annealing them in an inert atmosphere were studied. C–Pd films with different Pd content in a carbon matrix were investigated. SEM observation after heat treatment showed the agglomeration of palladium nanograins into bigger grains and significant changes in a topography and morphology of C–Pd films. XRD studies confirmed the formation of big (more than 100 nm in diameter) Pd nanograins as a result of the annealing process. FTIR studies showed that C–Pd films from PVD process contained fullerene C60 and palladium acetate (films precursors), which were decomposed during the annealing process.
Źródło:
Optica Applicata; 2013, 43, 1; 133-141
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of technological PVD process parameters on the topography, crystal and molecular structure of nanocomposite films containing palladium nanograins
Autorzy:
Rymarczyk, J.
Czerwosz, E.
Kozłowski, M.
Dłużewski, P.
Kowalski, W.
Powiązania:
https://bibliotekanauki.pl/articles/778619.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
palladium
carbon
SEM
AFM
TEM
FTIR
Opis:
The paper describes the preparation and characteristics of films composed of Pd nanograins placed in carbonaceous matrix. Films were obtained in PVD (Physical Vapor Deposition) process from two sources containing: the first one – fullerene powder and the second one – palladium acetate. The topographical, morphological and structural changes due to different parameters of PVD process were studied with the use of Atomic Force Microscopy and Scanning Electron Microscopy, whereas the structure was studied with the application of the Transmission Electron Microscopy and Fourier Transform Infrared Spectroscopy methods. It was shown that topographical changes are connected with the decomposition ratio of Pd acetate as well as the form of carbonaceous matrix formed due to this decomposition. Palladium nanograins found in all films exhibit the fcc structure type and their diameter changes from 2 nm to 40 nm depending on the PVD process parameters.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 3; 18-24
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological, topographical and FTIR characterizations of Pd–C films
Autorzy:
Rymarczyk, J.
Kamińska, A.
Kęczkowska, J.
Kozłowski, M.
Czerwosz, E.
Powiązania:
https://bibliotekanauki.pl/articles/173595.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
palladium nanocrystals
fullerene
PVD
Opis:
The structure, topography and morphology of Pd–C films were studied by AFM (atomic force microscopy), SEM (scanning electron microscopy), Raman and FTIR (Fourier transform infrared spectroscopy) methods. It was found that an increasing content of palladium in films causes a decrease in their roughness and size of nanograins. The topography and morphology of Pd–C films depend on the content of palladium in the film, what was found from the analysis of SEM and AFM images. FTIR and Raman spectra show that the content of fullerene and palladium in the film strongly depends on technological parameters of PVD (physical vapor deposition) process.
Źródło:
Optica Applicata; 2013, 43, 1; 123-132
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of electric current flow in 1D Pd-C nanostructure: comparison with experiment
Autorzy:
Bielski, W.
Kowalczyk, P.
Czerwosz, E.
Idzik, A.
Rymarczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/200117.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanocomposites
palladium
carbonaceous matrix
homogenization
Opis:
In this paper we propose a model of electric current flow through one-dimensional palladium-carbon nanostructure (nanowire) and compare the results of numerical computations with the experimental data. We focus on two aspects: 1) calculation of the current flow through the nanowire model, 2) determination of the macroscopic parameters in the nanocomposite in our model. Because of a complex micro-geometry of a nanowire, we apply the homogenization method to perform the numerical computations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 465-469
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing time effects on the surface morphology of C–Pd films prepared on silicon covered with SiO2
Autorzy:
Kozlowski, M.
Radomska, J.
Wronka, H.
Czerwosz, E.
Firek, P.
Sobczak, K.
Dluzewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/949412.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Pd
carbon
film
SEM
TEM
Opis:
Morphology changes of C–Pd films prepared in physical vapor deposition (PVD) process and next annealed in a temperature of 650 °C during different time were studied. These studies were performed with electron microscopy methods (scanning SEM and transmission TEM). It was found that not annealed films are flat and they are composed of grains with composite character and size of 100–200 nm. Pd nanocrystallite of a diameter of a few nanometers in some carbon matrix was placed in these grains. For annealed films, a formation of palladium nanograins with different sizes and shapes as well as a porous carbon matrix were observed. High resolution TEM investigation was used to determine a structure of all these grains. An increase in duration time of annealing process led to diminishing of the porosity of carbon matrix and a number of Pd grains situated on the film surface. It was also stated that covering of Si with SiO2 layer prevents formation of palladium silicide.
Źródło:
Optica Applicata; 2013, 43, 1; 81-89
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wielościennych nanorurek węglowych na wzrost bakterii z rodzaju Bacillus i produkcję biosurfaktantów
Effect of multiwalled carbon nanotubes on the growth of bacteria of the genus Bacillus and on the production of biosurfactants
Autorzy:
Płaza, G.
Kowalska, E.
Radomska, J.
Czerwosz, E.
Jangid, K.
Gawior, K.
Ulfig, K.
Janda-Ulfig, K.
Powiązania:
https://bibliotekanauki.pl/articles/236506.pdf
Data publikacji:
2009
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
nanotechnologia
nanorurki węglowe
biosurfaktanty
nanotechnology
carbon nanotubes
biosurfactant
Opis:
Celem badań była ocena wzrostu oraz zdolności do produkcji biosurfaktantów trzech szczepów bakterii z rodzaju Bacillus hodowanych w obecności wielościennych nanorurek węglowych. W wyniku badań stwierdzono, że bakterie te bardzo dobrze rosły w obecności nanorurek węglowych oraz produkowały biosurfaktanty. Wytworzone przez bakterie biosurfaktanty powodowały dyspersję nanorurek węglowych w hodowlach płynnych. Wielościenne nanorurki węglowe nie wpływały na morfologię i wzrost bakterii, stymulowały jednak tworzenie przetrwalników. Badania obejmowały również ocenę właściwości produkowanych biosurfaktantów przez bakterie rosnące w obecności nanorurek węglowych, tj. napięcia powierzchniowego, zdolności emulgujących i pieniących. Nie stwierdzono wpływu badanych nanorurek węglowych na właściwości powierzchniowe biosurfaktantów produkowanych przez te bakterie. Biosurfaktanty zmniejszały napięcie powierzchniowe, miały zdolności emulgujące w stosunku do wybranych substancji/mieszanin hydrofobowych oraz zdolności pieniące porównywalne z próbką kontrolną.
Three bacterial strains of the genus Bacillus were tested in order to ascertain how the presence of nanotubes in the culture medium influenced their growth, as well as their ability to produce biosurfactants. It was found that the bacteria grew very well in the presence of the nanotubes, and that they were capable of producing biosurfactants. The biosurfactants synthesized by the bacteria accounted for the dispersion of the carbon nanotubes in liquid cultures. Although the multiwalled carbon nanotubes did not affect the morphology or the growth of the bacteria, they were found to stimulate endospore production. The objective of the study was also to assess the properties of the biosurfactants produced by the bacteria growing in the presence of the carbon nanotubes, i.e. surface tension, emulsification and foamability. The nanotubes examined were found to exert no influence on the surface activity of the biosurfactants produced by the bacteria. The biosurfactants reduced surface tension, showed emulsifying properties towards some hydrophobic substances/mixtures, and displayed foamabilities comparable to those of the control.
Źródło:
Ochrona Środowiska; 2009, 31, 1; 21-24
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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