IRTUM – Institutional Repository of the Technical University of Moldova

Browsing Articole ştiinţifice by Author "URSAKI, Veacheslav"

Browsing Articole ştiinţifice by Author "URSAKI, Veacheslav"

Sort by: Order: Results:

  • Characterization of GaN thin films and Eu-doped GaN nanowires and nanoparticles produced on the basis of Ga2O3 nanomaterial 
    RUSU, Emil; URSAKI, Veacheslav; CULEAC, Ion; SIMINEL, Anatolii; RAEVSCHI, Simion; VLAZAN, Paulina; NICORICI, Alexandr (Academia de Ştiinţe a Moldovei, 2016)
    Due to advantageous properties such as wide bandgap, pronounced chemical and thermal stability, gallium nitride is currently considered as one of the most important semiconductor materials for practical applications. We ...
  • Characterization of p-NiO/n-Si heterojunctions prepared by spin coating method 
    MORARI, Vadim; ZALAMAI, Victor; RUSU, Emil; MONAICO, Eduard; URSAKI, Veacheslav; NIELSCH, Kornelius; TIGINYANU, Ion (Academia de Ştiinţe a Moldovei, 2019)
    In this paper, we present results on preparation of NiO thin films by spin-coating method. The films have been deposited on n-Si (100) substrates from 0.35 M aqueous solution of nickel chloride - NiCl2 *6H2 O or nickel ...
  • A comparative study of Cu-related Pasmonic effects in electrochemically nanostructured CuInSe2 and CuGaSe2 crystals 
    URSAKI, Veacheslav (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2013)
    We study the differences in electrochemical nanostructuring of CuInSe2 and CuGaSe2 crystals. To make the crystals suitable for electrochemical nanostructuring, they are subjected to thermal treatment either in vacuum or ...
  • A comparative study of GaN and Ga2O3 nanocrystals obtained by hydrothermal and solid state phase reactions 
    RUSU, Emil; URSAKI, Veacheslav; SIMINEL, Anatolii; RAEVSCHI, Simion; VLAZAN, Paulina (Institutul de Fizică Aplicată, 2014)
    There is actually a considerable interest in the preparation of nanoparticles on the basis of semiconductor and oxide materials due to the influence of nanoparticle dimensionality upon their optical, radiative, and magnetic ...
  • A comparative study of plasmonic effects in electrochemically nanostructured CuInS2 and CuGaS2 crystals 
    URSAKI, Veacheslav (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2014)
    We investigate the differences in electrochemical nanostructuring of CuInS2 and CuGaS2 crystals. It is shown that thermal treatment of CuInS2 crystals either in vacuum or in Zn vapors is a procedure providing necessary ...
  • Fresnel lens-type energy concentrator for space-based solar power systems 
    SERGENTU, Vladimir; URSAKI, Veacheslav; IOIŞER, Anatolii; ADAR, Eliezer (Romanian Academy Publishing House, 2018)
    In this paper a new concept of designing Fresnel lens concentrators on the basis of magnetic microwires with a complex spatial distribution of their density is proposed. The optical properties of microwires are analyzed ...
  • Injection photodiodes based on metal oxide semiconductors 
    MORARI, Vadim; URSAKI, Veacheslav; RUSU, Emil; TIGINYANU, Ion (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2020)
    A brief review of our recent research on injection photodiodes based on metal oxide semiconductors deposited onto Si substrates is presented. A series of ZnSnO, NiO, and Zn1-xMgxO thin films are prepared by aerosol spray ...
  • Morphology, optical and luminescence properties of ZnO layers doped with Al or Ag and co-doped with rare earth ions 
    ROGACHEV, Alexander; SEMCHEMKO, A.; GAISHUN, V.; RUSU, Emil; URSAKI, Veacheslav; CURMEI, Nicolai; ZALAMAI, Victor (Romanian Academy Publishing House, 2017)
    In this paper we propose a method for measuring the negative refraction index of films of optically transparent materials. Morphological, optical and luminescence properties of rare earth doped ZnO layers prepared by a ...
  • Mott type electrical conductivity in ZnSXSe1-x thin films 
    POPA, Mihail; TIGINYANU, Ion; URSAKI, Veacheslav (Romanian Academy Publishing House, 2017)
    Thin ZnSxSe1-x films on glass substrates have been obtained by thermal evaporation. Electrodes from In or other materials have been deposited on thin films, and the temperature dependence of electrical conductivity was ...
  • Nanostructured Film of Indium Phosphide as Biosensor in 1D Array Electrowetting System 
    SIRBU, Lilian; VODĂ, Irina; ESINENCO, Dorin; GANGAN, Sergiu; MULLER, Raluca; VOICU, Rodica Cristina; DǍNILǍ, Mihai; GHIMPU, Lidia; TIGINYANU, Ion; URSAKI, Veacheslav (Romanian Academy Publishing House, 2011)
    We demonstrated the fabrication of complex nanostructured InP membranes with porous compact packed structure that have been cut during electrochemical etching in the same anodic process. The membranes were filled with ...
  • Optical constants of ZnSxSe1–x thin films calculated from transmission spectra 
    POPA, Mihail; TIGINYANU, Ion; URSAKI, Veacheslav (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2017)
    We report the results of calculations of some optical parameters of ZnSxSe1–x thin films based on measured transmission spectra by using the Swanepoel’s method, the Wemple– DiDomenico single-oscillator model, and the ...
  • Photocatalytic Properties of TiO2 Nanotubes Doped with Ag, Au and Pt or Covered by Ag, Au and Pt Nanodots 
    ENACHI, Mihail; GUIX, Maria; BRANIŞTE, Tudor; POSTOLACHE, Vitalie; CIOBANU, Vladimir; URSAKI, Veacheslav; SCHMIDT, Oliver G.; TIGINYANU, Ion (Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Republic of Moldova, 2015)
    Titania nanotube arrays have been prepared by anodic oxidation of titanium foils in an electrolyte solution containing a mixture of hydrofluoric acid, ethylene glycol, and phosphoric acid. The initially amorphous nanotubes ...
  • Photoluminescence in ZnGa2O4 
    ZHITAR, V.; URSAKI, Veacheslav; ARAMĂ, Efim; SHEMYAKOVA, Tatiana; MUNTEAN, Ştefan (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2005)
    ZnGa2O4 compound has been prepared by a simple method of ceramic sintering. Its photoluminescence (PL) spectra have been studied using laser beam excitation (l = 334 nm) at 295 and 10 K. A blue-green long wavelength radiation ...
  • Preparation and photoluminescence of ZnGa2O4:Co 
    ZHITAR, V.; URSAKI, Veacheslav; VOLODINA, Galina; MUNTEAN, Ştefan; SHEMYAKOVA, Tatiana (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2007)
    Ceramic samples of ZnGa2O4 doped with Co have been prepared. Their photoluminescence = 351 nm) and various temperatures (10 – 300 K)spectra measured at laser excitation (λ contain a wide band, centered at 2.8 eV (10 K) ...
  • Raman scattering by porous structures with InAs quantum dots 
    MILEKHIN, Alexander; URSAKI, Veacheslav; SIRBU, Lilian; TOROPOV, Alexander; TIGINYANU, Ion; ZAHN, Dietrich R. T. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    In this paper we search for the possibilities of introducing porosity in InAs/AlAs/GaAs multilayer quantum dot structures as an additional tool for the modification of their phonon spectrum. Raman spectroscopy is used as ...
  • Scattering of a two-dimensional self-healing beam at the interface of a nanostructured medium with the vacuum 
    SERGENTU, Vladimir; URSAKI, Veacheslav (Romanian Academy Publishing House, 2018)
    In this paper the Fresnel’s formula are generalized to the case of a twodimensional (2D) self-healing beam incident on the interface of the vacuum with a nonmagnetic, homogeneous on average and isotropic nanostructured ...
  • Solar energy concentrators in geostationary orbits 
    SERGENTU, Vladimir; URSAKI, Veacheslav; IOIŞER, Anatolii; ADAR, Eliezer (Romanian Academy Publishing House, 2019)
    An important component of Space-based solar power (SBSP) systems is the solar energy concentrator that collects solar power in space and focusses it on solar cells or heat engines to produce electricity, which is consequently ...

Search DSpace


Browse

My Account