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Fabrication and Characterization of Transparent Tin Dioxide Films with Variable Stoichiometric Composition

100%
Ksenevich V., Adamchuk D., Odzhaev V., Zukowski P.
Acta Physica Polonica A
|
2015
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vol. 128
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issue 5
861-863
EN
Tin dioxide films with variable stoichiometric composition were fabricated by means of dc magnetron sputtering followed by a 2-stage annealing process. The structural and electrical properties of tin dioxide films were investigated by means of the Raman spectroscopy and impedance spectroscopy, respectively. It was found that crystallinity and grain size of tin dioxide films increase with the increasing annealing temperature. The most conductive samples were obtained at the annealing temperature 375°C. Increasing of the impedance of films annealed at higher temperatures is explained by decrease of the concentration of oxygen vacancies.
2
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Fabrication and Magnetotransport Properties of Carbon Films with Embedded Metal Nanoclusters

100%
Ksenevich V., Bashmakov I., Melnikov A., Wieck A.
Acta Physica Polonica A
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2005
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vol. 107
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issue 2
356-360
EN
2-dimensional arrays of Co- and Pd-clusters embedded in carbon films were fabricated by means of heat-treatment method of carboxylated cellulose films after the exchange of COOH-group protons by Co- and Pd-cations. The sizes of metal clusters within range 10 nm-1μm were obtained in dependence on the heat-treatment temperature. The dependencies of the resistance on temperature and magnetic field for the samples annealed at T=700ºC and 900ºC were measured. The R(T) dependencies both for carbon films with Co- and Pd-clusters can be fitted by expression R=R_0 exp(T_0/T)^{1/n} inherent for variable-range hopping. In the whole range of investigated magnetic field and temperature magnetoresistance was negative and can be related to quantum interference in the variable range hopping transport along neighboring alternative paths.
3
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Investigation of Quantum Effects in Carbonaceous Materials Near the Metal-Insulator Transition by Means of THz Photoconductivity

88%
Dorosinets V., Ksenevich V., Seliuta D., Martūnas Z., Valušis G.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
875-878
EN
A series of carbonaceous fibers with conductivity tuned to the metal-insulator transition were prepared by heat treatment of chemically modified polymer precursors. Peculiar behaviour of the resistivity versus temperature dependence R(T) at low temperatures suggests quantum corrections to the Drude conductivity due to weak localization and electron-electron interaction dominating in the conductivity. The THz conductivity method is employed to study the modification of the density of states and provides evidence for a strong change in density of states at the Fermi level caused by the quantum effects.
4
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AC-Conductivity of Thin Polycrystalline Tin Dioxide Films

76%
Ksenevich V., Gorbachuk N., Dauzhenka T., Bashmakov I., Poklonski N., Wieck A.
Acta Physica Polonica A
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2011
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vol. 119
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issue 2
146-147
EN
The electrical properties of polycrystalline tin dioxide films were investigated by impedance spectroscopy in the frequency range 100 Hz-1 MHz at temperatures 4.2 K, 77 K and 300 K. Analysis of the experimental data by means of complex nonlinear least squares method made it possible to divide the contributions of grain bulk and grain boundaries to the conductivity. It was found that at room temperature charge transport processes are mainly determined by the grain volume while at the low temperatures contribution from the grain boundaries to the impedance of the system prevails.
5
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Electrical Properties and Magnetoresistance of Nanogranular SnO_2 Films

76%
Ksenevich V., Dovzhenko T., Dorosinets V., Bashmakov I., Melnikov A., Wieck A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
1043-1046
EN
Magnetotransport properties of the nanogranular SnO_2 films were invesigated. Non-linear current-voltage (I-V) characteristics were observed at low temperatures. The temperature dependence of the resistance and non-ohmic I-V curves can be well approximated by fluctuation-induced tunnelling model, indicating importance of the contacts barriers between SnO_2 grains. Magnetoresistance was measured within temperature range 2-15.3 K and could be consistent with the variable-range hopping conduction mechanism due to existence of localized states on the surface of SnO_2 grains.
6
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Charge Carrier Transport Properties in Single-Walled Carbon Nanotube Fibers

64%
Ksenevich V., Seliuta D., Martūnas Z., Kašalynas I., Valušis G., Galibert J., Kozlov M., Samuilov V.
Acta Physica Polonica A
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2008
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vol. 113
|
issue 3
1039-1042
EN
Transport properties via temperature dependences of sample resistance R(T) and influence of microwave field of 10 GHz on the conductivity of the single-walled carbon nanotubes fibers are investigated. The R(T) dependences studied within 4.2-300 K can be well approximated by the Mott law for 3D variable range hopping below T=80 K and by typical law for fluctuation-induced tunnelling model within the temperature range 80-300 K. We associate the observed increase in the conductivity with microwave power by increase in hopping probability of the charge carriers between single-walled carbon nanotubes.
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