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Browsing Articole ştiinţifice by Author "URSAKI, V."

Browsing Articole ştiinţifice by Author "URSAKI, V."

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  • 11 - Ultra-thin membranes for sensor applications 
    TIGINYANU, I.; URSAKI, V.; POPA, V. (Woodhead Publishing, 2011)
    Technological approaches for the fabrication of ultra-thin membranes for sensor applications are reviewed, with the main focus on graphene and two-dimensional (2D) sheets of layered compounds such as BN, MoS2, Bi2Te3, ...
  • Birefringence of CuGa2S4 crystals 
    SYRBU, N.; DOROGAN, A.; URSAKI, V.; STAMOV, I.; TIGINYANU, I. M. (The Electrochemical Society, 2011)
    Investigation of the spectral characteristics as a function of the crystal thickness demonstrates that one can create filters using thin crystals for selecting several spectral lines. The wavelength of these lines is ...
  • A comparative study of photoconductivity decay in ZnO-based MSM structures and nanowires 
    RUSU, E.; POSTOLACHE, V.; CURMEI, N.; URSAKI, V. (Academy of Sciences of Moldova, 2016)
    Comparative analysis of transient photoconductivity in ZnO-based MSM structures and nanowires is performed in this paper. The measurements are carried out at room temperature in ambient air. The mechanisms of photoconductivity ...
  • “Dark” modes backscattering as possible rationale for anomalous retroreflection from strongly absorbing porous nanostructures 
    SERGENTU, V. V.; URSAKI, V.; MONAICO, Ed.; TIGINYANU, I. M.; PRISLOPSKI, S. Ya.; GAPONENKO, S. V. (World Scientific, 2017)
    The previously discovered anomalous retroreflection in a strongly absorbing nanostructured medium is explained by using “dark” and “bright” modes. The consideration provides rationale not only for the retroreflection itself ...
  • Doping Effects on Optical Properties of Low Temperature Grown ZnO Nanorod Arrays 
    LUPAN, O.; TIGINYANU, I.; URSAKI, V.; CHOW, L. (NSTI, 2010)
    In this work, we explore the influence of Ag dopant concentration on the structural and optical properties of ZnO nanorods synthesized by hydrothermal technique. We present original results of a systematic investigation ...
  • Effect of Sn Dopant on the Properties of ZnO Nanorod Arrays 
    LUPAN, O.; CHOW, L.; URSAKI, V.; MONAICO, E.; TIGINYANU, I.; SHISHIYANU, S.; SHISHIYANU, T.; PARK, S.; SCHULTE, A. (Institute of Electrical and Electronics Engineerings, IEEE, 2007)
    Sn-doped ZnO nanorod arrays were synthesized by a novel method combining the aqueous solution process with post-growth rapid photothermal processing (RPP). The post-growth RPP of Sn-doped ZnO nanostrnctures at 700 degC in ...
  • Electronic transitions and energy band structure of CuGaxAl1-xSe2 crystals 
    MAȘNIK, A.; ZALAMAI, V.; URSAKI, V. (Elsevier, 2021)
    Optical reflectance spectra have been investigated at photon energies higher than the band gap of CuGaxAl1-xSe solid solutions with x values varying from 0 to 1. The spectral dependence of the real ε1 and imaginary ε2 ...
  • Excitonic resonance spectra in QW and QD In0.3Ga0.7As/GaAs hetrostructures 
    DOROGAN, A.; DOROGAN, V.; MEREUTA, A.; SYRBU, A.; SYRBU, N.; VIERU, T.; URSAKI, V.; ZALAMAI, V. (Institutul de Fizică Aplicată al AŞM, 2012)
    The measurement of optical reflection and transmittance spectra had been carried out using MДР-2, JASCO-670 and СДЛ-1 spectrometers at 10K and 300K for S- and P-polarizations and different light angles incident on the ...
  • Interband optical transitions in the region of exciton resonances in In0.3Ga0.7As/GaAs quantum wells 
    SYRBU, N.; DOROGAN, A.; DOROGAN, V.; VIERU, T.; URSAKI, V.; ZALAMAI, V. (Academy of Sciences of Moldova, 2012)
    Reflectance spectra of quantum wells (QWs) with 8-nm-thick In0.3Ga0.7As layers with a 9-nm-thick GaAs barrier layer up and a 100-nm-thick barrier layer down were investigated in the spectral range of 0.5–1.6 eV in S- and ...
  • Luminescence of ZnGa2Î4 AND ZnAl2Î4 spinels doped with Eu3+AND Tb3+ ions 
    RUSU, E.; URSAKI, V.; NOVITSCHI, G.; BURLACU, A.; PETRENKO, P.; KULIUK, L. (I. I. Mechnikov National University, Odessa, 2008)
    Spinel type mono-phase the ZnGa2O4 and ZnAl2O4 compounds doped with Eu3+ and Tb3+ ions were obtained using two methods: solid phase reactions and deposition from chemical solutions. The luminescent analysis of the materials ...
  • Luminescence properties of ZnGa2O4 and ZnAl2O4 spinels doped with Eu3+ and Tb3+ ions 
    RUSU, E.; URSAKI, V.; NOVITSCHI, G.; VASILE, M.; PETRENCO, P.; KULYUK, L. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    Spinel-type ZnGa2O4 and ZnAl2O4 powders doped with Eu3+ and Tb3+ ions, including dual doping, have been prepared by solid phase reactions and by deposition from chemical solutions. XRD analysis demonstrates the high quality ...
  • Magnetic properties of microwires and filiform nanostructures with elongated magnetic inclusions 
    ALEINICOV, E.; IOISHER, A.; MAKHNOVSKIY, D.; POSTOLACHE, V.; TIGINYANU, I.; URSAKI, V. (Springer Nature Switzerland, 2016)
    We developed technological procedures for preparation of filiform nanostructures (FNSs) on the basis of stretching microwires with magnetic material cores. It is shown that disruptions of the microwire core occur for these ...
  • Mechanical behavior at point contact of CdGa2S4 and CdGa2Se4 
    PYRTSAC, C.; SHIKIMAKA, O.; GRABCO, D.; PRISACARU, A.; PARVAN, V.; URSAKI, V. (Academia de Ştiinţe a Moldovei, 2014)
    In this study the deformation peculiarities of CdGa2S4 and CdGa2Se4 subjected to point contact (indentation) were investigated. By applying a depth-sensing nanoindentation technique with Berkovich pyramidal diamond indenter, ...
  • Mechanical properties and Raman scattering investigation under indentation of CdGa2S4 and CdGa2Se4 
    SHIKIMAKA, O.; BURLACU, A.; GRABCO, D.; PARVAN, V.; PYRTSAC, C.; URSAKI, V. (IOP Publishing, 2016)
    The behavior of CdGa2S4 and CdGa2Se4 single crystalline semiconductors under Berkovich indentation of the (1 1 2) face in the load range of 10–700 mN has been investigated. Values of hardness and Young’s modulus have been ...
  • A method of virtual image for determination of negative refraction index of a nanomedium 
    SERGENTU, V.; URSAKI, V. (Romanian Academy Publishing House, 2017)
    In this paper we propose a method for measuring the negative refraction index of films of optically transparent materials. The method is based on recording the direction of propagation and the shifting of the ray reflected ...
  • Nanofibrous zinc oxide films synthesized by magnetron sputtering 
    GHIMPU, L.; LUPAN, O.; POPESCU, S.; URSAKI, V.; TIGINYANU, I.; CHOW, L.; CHAI, G.; PARK, S.; SCHULTE, A. (IEEE, 2011)
    ZnO nanofibrous-based materials required for sensors and dye-solar cells have been grown on tin oxide/glass substrates by magnetron sputtering. Synthesis regimes have been identified that give nanoporous and nanofibrous ...
  • Nanoimprint lithography (NIL) and related techniques for electronics applications 
    TIGINYANU, I.; URSAKI, V.; POPA, V. (Woodhead Publishing, 2011)
    This chapter provides a review of nanoimprint lithography techniques, highlighting their potential to surpass photolithography in resolution, and, at the same time, to allow mass fabrication at a lower cost. The current ...
  • Nanostructured indium phosphide used in electrowetting system for biosensor applications 
    SIRBU, L.; VODA, I.; ESINENCO, D.; MULLER, R.; VOICU, R.; DANILA, M.; GHIMPU, L.; TIGINYANU, I. M.; URSAKI, V. (IEEE, 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 ...
  • Nanostructures Obtained Using Electric Discharges at Atmospheric Pressure 
    TOPALA, P.; OJEGOV, A.; URSAKI, V. (Springer Nature Switzerland, 2016)
    The results of theoretical and experimental investigations of physical phenomena that accompany the formation of oxide and hydroxide nano-metric pellicles on metal surfaces by applying pulsed electrical discharge machining ...
  • Optical and sensory properties of ZnO nanofibrous layers grown by magnetron sputtering 
    GHIMPU, L.; TIGINYANU, I. M.; URSAKI, V.; LUPAN, O.; CHOW, L.; RUDZEVICH, Y.; LIN, Y. (Institute of Electrical and Electronics Engineerings, IEEE, 2012)
    This paper presents optical and sensory properties of ZnO nanofirous layers grown by a cost-effective and fast fabrication method based on magnetron sputtering. The as-prepared nanofibrous layers show good conductive ...

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