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Browsing Articole ştiinţifice by Author "URSAKI, V."

Browsing Articole ştiinţifice by Author "URSAKI, V."

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  • Photocatalytic indium-tantalum-oxide and its photoluminescence 
    KANTSER, V.; MUNTEAN, S.; ZHITAR, V.; VOLODINA, G.; KAPLIN, V.; URSAKI, V. (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2003)
    Both bulk ceramic and powder like samples In0,9Ni0,1TaO4 photocatalytic semiconductor oxides have been obtained by the method of solid phase reactions. The photocatalytic activity on water splitting has been investigated ...
  • Photoluminescence study of /spl alpha/-ZnAl/sub 2/S/sub 4/ single crystals 
    URSAKI, V.; BOLDURESCU, V.; BURLAKOV, I.; SYRBU, N.; NYARI, T. (IEEE, 2000)
    Photoluminescence (PL) spectra of ZnAl/sub 2/S/sub 4/ crystals with spinel structure were studied under the extrinsic excitation. The PL bands at 0.98 eV and 1.34 eV are suggested to be caused by native defects; while the ...
  • Preparation and characterization of Ga2O3 and GaN nanoparticles 
    RUSU, E.; URSAKI, V.; RAEVSCHI, S.; VLAZAN, P. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2015)
    In this communication, we present results on preparation of GaN nanoparticles by conversion of Ga2O3 nanocrystals in a flow of NH3 and H2. The monoclinic Ga2O3 nanoparticles have been prepared by hydrothermal method with ...
  • Preparation and characterization of GaP colloidal nanoparticles and films 
    IACOB, M.; RUSU, Emil; PYSHKIN, S.; URSAKI, V.; GUTSUL, T.; BALLATO, John (Society of Photo-Optical Instrumentation Engineers, SPIE, 2012)
    In this communication, we present results of investigations of the influence of technological conditions upon the properties of GaP nanoparticles produced by using a new precursor as a source of Ga atoms. The obtained ...
  • Processing-Induced Modification of Photo- and Cathodoluminescence Spectra of TiO2 Nanotubes 
    ENACHI, M.; STEVENS-KALCEFF, M.; BURLACU, A.; TIGINYANU, I.; URSAKI, V. (The Electrochemical Society, 2012)
    Cathodoluminescence and photoluminecsence are investigated in titanium dioxide nanotubes (TiO2 NTs) produced in an ethylene glycol based electrolyte with the variation of the temperature of the electrolyte which allows the ...
  • Quantum wells parameters of In0,3Ga0,7As/GaAs VCSEL lasers 
    DOROGAN, A.; DOROGAN, V.; MEREUTA, A.; SYRBU, A.; SYRBU, N.; VIERU, T.; URSAKI, V.; ZALAMAI, V. (Institutul de Fizică Aplicată al AŞM, 2012)
    Injection lasers based on quantum well (QW) and quantum dots (QD) heterostructures with a low value of threshold current density Jth with continuous emission regime and output power value of 3W have been manufactured. VCSEL ...
  • Rayleigh scattering of a metal nanoparticle on a flat dielectric surface 
    SERGENTU, V.; ESINENCO, D.; SIRBU, L.; VODĂ, I.; VOICU, R.; TIGINYANU, I. M.; URSAKI, V. (IEEE, 2010)
    It is shown experimentally and theoretically that electromagnetic interaction of a nanoparticle with a flat dielectric surface leads to occurrence of an additional peak in the spectrum of Rayleigh scattering which is due ...
  • Renormalization of the Coulomb law in anomalous electron transport with giant current density at room temperature 
    SERGENTU, V.; TIGINYANU, I.; URSAKI, V. (Editura Academiei Romane, 2013)
    We propose an explanation of anomalous electron transport with giant current density at room temperature as a manifestation of high-temperature superconductivity in artificial periodic lattices of metallic nanospheres. The ...
  • Responsivity and detectivity of Zn0.8Mg0.2O/p-Si prepared by spin coating and aerosol deposition method 
    MORARI, V.; RUSU, E.; URSAKI, V.; TIGINYANU, I. M. (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu", 2021)
    In this paper, we present data concerning responsivity and detectivity of Zn0.8Mg0.2O/p-Si photodetectors based on thin films prepared by spin-coating and aerosol deposition methods from 0.35 M aqueous solution using Zn ...
  • Semiconductor-electrolyte junction at the n-GaAs (n-InP)/Na/sub 2/SiO/sub 3/ solution interface 
    COJOCARU, A.; SHERBAN, D.; SIMASHKEVICH, A.; TIGINYANU, I.; TSIULYANU, I.; URSAKI, V. (IEEE, 2002)
    The photoelectrochemical properties of the electrolyte-semiconductor interface in the chains formed by carbon auxiliary electrode-electrolyte-n-GaAs or n-InP semiconductors have been investigated. Besides bulk n-GaAs ...
  • Spatial dispersion effects in the exciton-polariton reflectivity spectra of CuGaS/sub 2/ crystals 
    SYRBU, N.; URSAKI, V.; NYARI, T.; BLAJE, M.; PRUNIC, P.; TEZLEVAN, V. (IEEE, 2000)
    The analysis of the exciton reflectivity contour in CuGaS/sub 2/ crystals at 8 K was carried out. Absorption and luminescence spectroscopy was employed for additional characterization. The value of the exciton Ridberg ...
  • Surface plasmon resonance in Ag nanoparticles deposited inside porous GaP templates 
    SIRBU, L.; SERGENTU, V.; URSAKI, V.; TIGINYANU, I.; PIREDDA, G.; BOYD, R. W. (IEEE, 2008)
    Surface plasmon resonance is studied for Ag nanoparticles electrochemically deposited on bulk GaP substrates and inside porous GaP templates. The size and density of Ag nanoparticles are controlled by the conditions of ...
  • Synthesis of nanostructured Al-doped zinc oxide films on Si for solar cells applications 
    LUPAN, O.; SHISHIYANU, S.; URSAKI, V.; KHALLAF, H.; CHOW, L.; SHISHIYANU, T.; SONTEA, V.; MONAICO, E.; RAILEAN, S. (ELSEVIER, 2009)
    Al-doped ZnO thin films have been prepared by a novel successive chemical solution deposition technique. The variation in morphological, structural, electrical, and optical properties of nanostructured films with doping ...
  • Ultrashort Electromagnetic Modes in the Low Frequency Region of the Spectrum in a Nanocylinder Array 
    SIRBU, L.; SERGENTU, V.; MULLER, R.; URSAKI, V.; TIGINYANU, I. M. (Springer Nature Switzerland, 2014)
    In this work we present the theoretical model of existence of ultrashort modes in low frequency region of the electromagnetic spectrum in a system of nanocilinders array. These modes have no analogue in a spectrum with ...
  • Use of porous GaAs electrodes in photoelectrochemical cells 
    COJOCARU, A.; SIMASHKEVICH, A.; SHERBAN, D.; TIGINYANU, I.; URSAKI, V.; TSIULYANU, I.; USATYI, I. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2005)
    The photoelectrochemical properties of semiconductor-electrolyte solar cells with carbon auxiliary electrode and colloidal aqueous solution of Na2SiO3 have been investigated. Bulk n-type single crystalline and nanoporous ...
  • Variable-range hopping conductivity in Cu2ZnGeSe4 single crystals 
    GUC, M.; LISUNOV, K. G.; HAJDEU, E.; LEVCENKO, S.; URSAKI, V.; ARUSHANOV, E. (ELSEVIER, 2014)
    Resistivity, ρ(T), of the Cu2ZnGeSe4 single crystals is investigated between T~10 and 300K. The Mott variable-range hopping (VRH) conductivity is observed in the temperature interval of ~80–230K. Analysis of the Mott VRH ...
  • WO3/WS2 composite materials for gas sensor and energy storage applications 
    URSAKI, V.; GHIMPU, L.; MESTERCA, R.; BRANCOVEANU, O.; PRODANA, M.; ENACHESCU, M.; DIMITRACHI, S.; TIGINYANU, I. (Institutul de Fizică Aplicată, 2018)
    Transition metal binary compounds, especially oxides and chalcogenides, are material of choice for many applications. Particularly, tungsten trioxide (WO3) has been extensively studied due to its outstanding electrochromic ...
  • Yellow Luminescence and Optical Quenching of Photoconductivity in Ultrathin Suspended GaN Membranes Produced by Surface Charge Lithography 
    POPA, V.; BRANISTE, T.; STEVENS-KALCEFF, M. A.; GERTHSEN, D.; BRENNER, P.; POSTOLACHE, V.; URSAKI, V.; TIGINYANU, I. M. (American Scientific Publishers, 2013)
    Spatial and spectral distribution of cathodoluminescence as well as photoelectrical properties under excitation with two beams of monochromatic radiation of various wavelengths are investigated in ultrathin suspended GaN ...
  • ZnO Micro/Nano Structures by MOCVD and Vapour Transport Technique: Growth and Characterization 
    RUSU, E.; BURLACU, A.; URSAKI, V.; STRATAN, G.; PURICA, M.; BUDIANU, E.; MONAICO, E. (IEEE, 2007)
    ZnO micro/nano structures were grown by metalo-organic chemical vapour deposition (MOCVD) and chemical vapour transport and condensation deposition process on Si and glass substrates. Using MOCVD method were grown uniform ...

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