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Wyświetlanie 1-15 z 28
Tytuł:
Preparation and Characterization of Aligned Iron Oxide Carbon Nanotube Thin Film
Autorzy:
Hekmatara, H.
Seifi, M.
Rozati, S.
Powiązania:
https://bibliotekanauki.pl/articles/1206613.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Fg
73.61.-r
Opis:
Thin films of acid-functionalized multiwall carbon nanotubes (O-MWCNT) with different concentrations and coated O-MWCNT with $Fe_3O_4$ nanoparticles (MWCNT/$Fe_3O_4$) were prepared on glass substrate at 300C by spray pyrolysis technique. In order to study the effect of nanotubes alignment on the physical properties of carbon nanotube films, thin film of iron oxide nanoparticles coated carbon nanotubes was deposited under magnetic field of 0.4 T. All samples were characterized using UV-Vis spectroscopy, X-ray diffraction, scanning electron microscopy, and the Hall effect experiment. Results show that the electrical conductivity and optical transmittance of carbon nanotubes thin films depend on the concentration of carbon nanotubes and their arrangement at the films. Aligning carbon nanotubes in thin films leads to an obvious improvement in electrical and optical properties of thin films.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 77-81
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing Effect on Dark Electrical Conductivity and Photoconductivity of Ga-In-Se Thin Films
Autorzy:
Isik, M.
Gullu, H.
Powiązania:
https://bibliotekanauki.pl/articles/1029832.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.-h
73.61.-r
73.61.Jc
Opis:
Dark-conductivity and photoconductivity properties of thermally evaporated Ga-In-Se (GIS) thin films were investigated in the temperature range of 80-430 K. All measurements were performed on as-grown and annealed GIS thin films at 300 and 400° to get information about the effect of the annealing temperature on the conductivity properties. Room temperature conductivity was obtained as 1.8 × 10^{-8} Ω^{-1} cm^{-1} for as-grown films and increased to 3.6 × 10^{-4} Ω^{-1} cm^{-1} for annealed films at 400°. Analysis of the dark-conductivity data of as-grown films revealed nearly intrinsic type of conductivity with 1.70 eV band gap energy. Temperature dependent dark conductivity curves exhibited two regions in the 260-360 and 370-430 K for both of annealed GIS films. Conductivity activation energies were found as 0.05, 0.16 and 0.05, 0.56 eV for films annealed at temperatures of 300 and 400°, respectively. The dependence of photoconductivity on illumination intensity was also studied in the range from 17 to 113 mW/cm^{2}.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1119-1124
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterized Microstructure and Electrical Properties of Hydrogenated Nanocrystalline Silicon Films by Raman and Electrical Conductivity Spectra
Autorzy:
Xiao-Yong, Gao
Jian-Tao, Zhao
Yu-Fen, Liu
Qing-Geng, Lin
Yong-Sheng, Chen
Jin-Hua, Gu
Shi-E, Yang
Jing-Xiao, Lu
Powiązania:
https://bibliotekanauki.pl/articles/1808127.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.23.Cq
73.61.-r
Opis:
Microstructure and electrical properties of hydrogenated nanocrystalline silicon (nc-Si:H) film deposited on glass substrate at low temperature were characterized by average grain size, crystallinity, and dark electrical conductivity data obtained from the Raman and electrical conductivity spectroscopy, respectively. The average grain size, crystallinity and electrical conductivity have a similar change with substrate temperature. A threshold substrate temperature determined by silane concentration appears in their corresponding spectroscopy vs. substrate temperature. The dependence of crystallinity, average grain size and electrical conductivity on substrate temperature were accounted for by surface diffusion model and heterojunction quantum dot model, respectively.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 738-741
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Toward Finding a Commercial Method for Deposition of Nanostructured $SnO_2$ Thin Films
Autorzy:
Memarian, N.
Rozati, S.
Powiązania:
https://bibliotekanauki.pl/articles/1419889.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Fd
73.61.-r
73.61.Ey
Opis:
Nanostructured tin oxide $(SnO_2)$ thin films have been prepared by spray pyrolysis technique. The effects of deposition conditions such as substrate temperature and tin chloride concentration in the precursor solution on physical properties of films have been investigated. The physical characterization of samples was carried out by UV-VIS spectroscopy, X-ray diffraction, scanning electron microscopy, and the Hall effect experiment for optical, structural, morphological and electrical studies, respectively. The films are polycrystalline in nature with a tetragonal crystal structure. The preferred orientation has been changed by changing the deposition parameters. In the case of changing the substrate temperature, (211) was found as the preferred orientation, while by changing the molarities of the solution, (301) orientation was grown as well as (211). The deposition temperature was optimized to 450°C; whereas the optimum solution concentration was found to be 0.2 mol/L. Films deposited at foregoing conditions have good optoelectrical properties which make them suitable for applying in different optoelectronic devices.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 202-206
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Ballistic Transport in Wires of n-PbTe
Autorzy:
Grabecki, G.
Wróbel, J.
Dietl, T.
Papis, E.
Kamińska, E.
Piotrowska, A.
Ueta, Y.
Sprinholtz, G.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1968110.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.-r
73.23.Ad
73.50.Dn
Opis:
We present results of magnetotransport studies on quantum wires of submicron PbTe epilayers, fabricated by means of electron beam lithography and dry etching. When the wire width is reduced down to 1 μm, the transition from diffusive to ballistic regime is observed. Effects associated with collimation and boundary scattering are found in the Hall, longitudinal, and van der Pauw magnetoresistance for wires and junctions in the shape of a cross.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 789-792
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Road to Quantum Boxes
Autorzy:
Chang, L. L.
Powiązania:
https://bibliotekanauki.pl/articles/1946514.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
73.61.-r
78.66.-w
Opis:
Quantum wells and superlattices have evolved over the last two decades to become a prominent multi-disciplinary field in condensed matter science. From the first observation of resonant tunneling to the recent realization of the quantum box, in this work we provide a summary description of the historical development of the field, known today as quantum structures. The focus is on the physics aspect with emphasis on important experimental observations that collectively define the field and set its direction of development.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 603-612
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Hot Electrons in ZnSe-ZnTe Double Barrier Heterostructures
Autorzy:
Bała, P.
Powiązania:
https://bibliotekanauki.pl/articles/1860709.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.-w
73.40.Gk
73.61.-r
Opis:
In this paper we perform a detailed study of the transport of hot electrons in the double barrier heterostructures with the presence of a collector barrier. This system is considered as a double barrier resonant tunneling device. The electron is described by time-dependent Schrodinger equation, which allows us to study detailed dynamics of the carriers. The influence of an energy step in the collector area of the device on the tunneling probability is investigated. The significant role of dissipation due to electron-phonon interactions is presented.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 709-714
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photocatalytical Decomposition of Contaminants οn Thin Film Gas Sensors
Autorzy:
Radecka, M.
Łysoń, B.
Lubecka, M.
Czapla, A.
Zakrzewska, K.
Powiązania:
https://bibliotekanauki.pl/articles/1539145.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.-r
73.90.+f
82.50.Hp
Opis:
Gas sensing materials have been prepared in a form of $TiO_{2}-SnO_{2}$ thin films by rf reactive sputtering from $Ti:SnO_{2}$ and $Sn:TiO_{2}$ targets. Material studies have been performed by scanning electron microscopy, atomic force microscopy, X-ray diffraction at grazing incidence, Mössbauer spectroscopy, X-ray photoelectron spectroscopy and optical spectrophotometry. Dynamic gas sensing responses have been recorded as reproducible changes in the electrical resistance upon introduction of hydrogen at a partial pressure of 100-6000 ppm over a wide temperature range 473-873 K. Contamination experiments have been carried out with the motor oil (40 vol.% solution in $CCl_{4}$) in order to study the effect of UV light illumination on the gas sensor response. Optical spectroscopy has been applied to monitor the photodecomposition of the test compound, bromothymol blue. The Electronic Nose, ALPHA MOS FOX 4000 has been used in order to differentiate between different groups of motor oil vapors.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 415-419
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Characterization of Ammonia Carbon-Based Sensors
Autorzy:
Kościński, M.
Seredych, M.
Bandosz, T.
Śliwińska-Bartkowiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402567.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
73.50.-h
73.61.-r
Opis:
A sensor response parameters of the ammonia sensors which are prepared by using composite of graphene oxide and poly(4-styrenesulfonic acid-co-maleic acid) sodium salt derived carbon are presented. Using the self-designed interdigitated electrode on the experimental setup, we were able to determine the capacity for gas sensing as a sensor response for low ammonia concentrations (20, 50, and 100 ppm).
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 182-184
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization Reversal in Cobalt Nanocolumn Structures Obtained by Glancing Angle Deposition
Autorzy:
Buchta, K.
Schmidt, Ch.
Trykowski, G.
Biniak, S.
Kempiński, M.
Luciński, T.
Powiązania:
https://bibliotekanauki.pl/articles/1428548.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
73.50.-h
73.61.-r
Opis:
An advanced deposition technique known as glancing angle deposition was used to fabricate randomly seeded magnetic cobalt columnar nanostructures. The existence of nanocolumns was confirmed by the cross-section scanning electron microscopy. The evolution in the magnetization reversal mechanism as a function of the film thickness was investigated. The coercivity $H_{C}$ and $M_{R}//M_{S}$ ratio (where $M_{R}$ and $M_{S}$ denote the remanent and saturation magnetization, respectively), derived from the magnetic hysteresis loops, are discussed as a function of the angle between the external magnetic field and the surface normal. The direction of the magnetization easy/hard axis and the columns inclination angle were determined on the basis of the angular dependences of the $H_{C}$ and the $M_{R}//M_{S}$. A crossover from the coherent rotation, based on the Stoner-Wohlfarth model, to the curling reversal mode was observed.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1222-1224
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoconductivity Study of Sputter-Deposited $Cu_2O$ Films
Autorzy:
Bhattacharyya, S.
Reppin, D.
Sanguino, P.
Ayouchi, R.
Polity, A.
Schwarz, R.
Hofmann, D.
Meyer, B.
Powiązania:
https://bibliotekanauki.pl/articles/1492344.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.-w
73.50.-h
73.61.-r
Opis:
Cuprous oxide $(Cu_2O)$ thin films were deposited by radio frequency sputtering technique on fused silica substrates. The X-ray diffraction study of the $Cu_2O$ samples showed reflections from (111) and (200) planes of cubic $Cu_2O$. The samples were then annealed at 1008 K in nitrogen $(N_2)$ atmosphere. Annealed samples indicated strain relaxation. The samples were then characterized optically by measuring the transmittance using an ultraviolet-visible-near infrared photospectrometer. The band gap of the as-deposited samples were found to be ≈ 2.1 eV, whereas the annealed samples had a band gap of ≈ 2.6 eV. The transient photocurrent decay measurements of the annealed films indicated slow non-exponential power law decays in several time windows, indicating multiple trapping of the carriers in the deep defects within the band gap. The steady-state photo and dark current measurement and persistent photocurrent (PPC) was carried out on the annealed samples. In general, the photocurrent was found to be much smaller than the dark current. The steady-state and transient photocurrent measurements were utilized to determine the carrier lifetime-mobility product, 〈μτ 〉 of the samples and to determine the carrier mobility, 〈μ 〉.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-011-A-014
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Electrical Characterization of Undoped Diamond Layer Grown by HF CVD
Autorzy:
Banaszak-Piechowska, A.
Paprocki, K.
Fabisiak, K.
Dudkowiak, A.
Szybowicz, M.
Staryga, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032579.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
81.05.ug
73.50.Gr
73.61.-r
Opis:
The undoped diamond layers were prepared using hot filament chemical vapor deposition technique. The controlled variation of the deposition parameters resulted in the layers with varying amount of nondiamond impurities. Routine characterization of the layers was carried out using scanning electron microscopy, X-ray diffractometry, and the Raman spectroscopy. Detailed measurements of room temperature electrical conductivity (σ₃₀₀), current-voltage characteristics have yielded useful information about the electrical conduction mechanism in this interesting material. The σ₃₀₀ and I-V characteristic measurements were done in sandwiched configuration taking care off the surface effects. The diamond shows room temperature dc conductivity reaching the values in the range of σ₃₀₀ ≈0.1-1 μS/cm. The I-V characteristics in these layers show space charge limited conduction behavior with I ~ V² in high voltage region. The obtained results are explained in terms of chemically adsorbed hydrogen on the surface of diamond layers, which is a source of acceptor states just above the top of valence band.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1411-1414
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonance Spectra of Quantum Dots in Magnetic Field
Autorzy:
Bylicki, M.
Jaskólski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1969032.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
73.61.-r
85.30.Vw
73.23.Hk
Opis:
Influence of magnetic field on the energy positions and widths of one electron resonance states in a multi-shell spherical quantum dot is investigated. The one-band effective mass approximation is assumed. The complexeigenvalue Schrodinger equation approach involving complex rotation of coordinates is used to obtain complex eigenenergies, E$\text{}_{r}$ - iΓ/2, corresponding to resonance states. We show how the magnetic field changes the resonance energy, E$\text{}_{r}$, and decay rate, Γ, yielding bound states for some particular cases.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 271-276
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal-Semiconductor Transition on the Surface and in the Bulk of Europium Hydride Thin Film
Autorzy:
Knor, M.
Nowakowski, R.
Duś, R.
Powiązania:
https://bibliotekanauki.pl/articles/1418265.pdf
Data publikacji:
2012-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
67.63.Gh
73.61.-r
78.66.-w
73.20.-r
Opis:
Thin europium films (20-50 nm thick) on a glass substrate were transformed into $EuH_x$ (0 < x < 2) by interaction with H_2 introduced into the reactor in successive calibrated doses. By measuring the pressure, the hydrogen uptake (H/Eu) was determined at every step of the reaction. In situ monitoring of bulk properties (electrical resistance R(H/Eu), relative transparency to light T(H/Eu)/$T_0$ and (H/Eu) dependent light transparency spectrum) confirms metal-semiconductor transition at room temperature. Both the electrical resistance and optical transparency of the film strongly increase with hydrogen concentration as a consequence of the resulting increase of the content of semiconducting dihydride. Moreover, the course of work function changes ΔΦ(H/Eu) indicates inversion of the charge-transfer direction on the surface. The transition at room temperature from positively to negatively polarized hydrogen adsorbate was observed in situ during hydrogen uptake. As a result, the work function at equilibrium state varies with hydrogen content from +18 to -18 mV with respect to pure metal film, reflecting the change of "mirror potential" generated on the surface due to the accumulation of hydrogen adsorbates in the subsurface region.
Źródło:
Acta Physica Polonica A; 2012, 122, 4; 698-703
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of the Critical Temperature Induced by the Quantum Size Effect in Superconducting Nanofilms
Autorzy:
Wójcik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1374149.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.-w
73.61.-r
74.78.Na
Opis:
The interplay between the quantum size effect and superconductivity in the metallic Al nanofilms has been studied with the use of the self-consistent numerical solutions of the Bogoliubov-de Gennes equations. We have shown that the critical temperature of the metallic nanofilm oscillates as a function of the nanofilm thickness. This phenomenon results from the quasi-particle energy quantization induced by the confinement of electrons in the direction perpendicular to the film. For the ultrathin nanofilms with thickness 1-2 nm we have found that the critical temperature increases up to value several times higher as compared to the one measured in the bulk.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-130-A-132
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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