Articole ştiinţifice: Recent submissions

  • Structural and Vibrational Study of Pseudocubic CdIn2Se4 under Compression 
    SANTAMARÍA-PÉREZ, David; GOMIS, Oscar; PEREIRA, André L. J.; VILAPLANA, Rosario; POPESCU, Catalin; SANS, Juan Angel; MANJÓN, Francisco Javier; RODRÍGUEZ-HERNÁNDEZ, Placida; MUÑOZ, Alfonso; URSAKI, Vladislav V.; TIGINYANU, Ion M. (American Chemical Society, 2014)
    We report a comprehensive experimental and theoretical study of the structural and vibrational properties of α-CdIn2Se4 under compression. Angle-dispersive synchrotron X-ray diffraction and Raman spectroscopy evidence that ...
  • 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 ...
  • Learning mechanisms in memristor networks based on GaN nanomembranes 
    DRAGOMAN, Mircea; TIGINYANU, Ion; DRAGOMAN, Daniela; DINESCU, Adrian; BRANISTE, Tudor; CIOBANU, Vladimir (AIP Publishing LLC, 2018)
    We demonstrate experimentally that single crystalline GaN nanomembranes arranged in simple networks exhibit learning mechanisms such as habituation and dishabituation followed by storage of the response to a certain ...
  • Morphology and chemical composition microanalysis of 2D and 3D ordered structures on porous InP 
    LANGA, S.; SIRBU, L.; MONAICO, E.; CARSTENSEN, J.; FÖLL, H.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2005)
    Porous InP proves to be promising for use in nanotechnologies due to the possibility to fabricate ordered structures like two-dimensional (2D) single crystals of nanopores. The main goal of this paper is to demonstrate ...
  • Ultra-thin semiconductor membrane nanotechnology based on surface charge lithography 
    TIGINYANU, Ion; POPA, Veaceslav; STEVENS-KALCEFF, Marion A. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2011)
    We show that by subjecting GaN epilayers on sapphire substrates to low-energy/low-dose ion treatment with subsequent photoelectrochemical etching it is possible to fabricate ultra-thin GaN membranes in the form of nano-roof ...
  • Structural and Vibrational Properties of CdAl2S4 under High Pressure: Experimental and Theoretical Approach 
    SANS, Juan Ángel; SANTAMARÍA-PÉREZ, David; POPESCU, Catalin; GOMIS, Oscar; MANJÓN, Francisco Javier; VILAPLANA, Rosario; MUÑOZ, Alfonso; RODRÍGUEZ-HERNÁNDEZ, Plácida; URSAKI, Veaceslav V.; TIGINYANU, Ion M (American Chemical Society, 2014)
    The behavior of defect chalcopyrite CdAl2S4 at high pressures and ambient temperature has been investigated in a joint experimental and theoretical study. High-pressure X-ray diffraction and Raman scattering measurements ...
  • Optical reflectance studies of highly specular anisotropic nanoporous (111) InP membrane 
    STEELE, J. A.; LEWIS, R. A.; SIRBU, L.; ENACHI, M.; TIGINYANU, I. M.; SKURATOV, V. A. (IOP Publishing, 2015)
    High-precision optical angular reflectance measurements are reported for a specular anisotropic nanoporous (111) InP membrane prepared by doping-assisted wet-electrochemical etching. The membrane surface morphology was ...
  • HgGa2Se4 under high pressure: An optical absorption study 
    GOMIS, O.; VILAPLANA, R.; MANJÓN, F. J.; RUIZ-FUERTES, J.; PÉREZ-GONZÁLEZ, E.; LÓPEZ-SOLANO, J.; BANDIELLO, E.; ERRANDONEA, D.; SEGURA, A.; RODRÍGUEZ-HERNÁNDEZ, P.; MUÑOZ, A.; URSAKI, V. V.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2015)
    High-pressure optical absorption measurements have been performed in defect chalcopyrite HgGa2Se4 to investigate the influence of pressure on the bandgap energy and its relation with the pressure-induced order–disorder ...
  • Anomalous retroreflection from nanoporous materials as backscattering by `dark' and `bright' modes 
    SERGENTU, V. V.; PRISLOPSKI, S. Ya.; MONAICO, E. V.; URSAKI, V. V.; GAPONENKO, S. V.; TIGINYANU, I. M. (IOP Publishing, 2016)
    In this paper the mechanisms of previously experimentally observed anomalous retroreflection in a strongly absorbing nanostructured medium are explained by using ‘dark’ and ‘bright’ modes. The observed regularities are ...
  • Targeting Endothelial Cells with Multifunctional GaN/Fe Nanoparticles 
    BRANISTE, Tudor; TIGINYANU, Ion; HORVATH, Tibor; RAEVSCHI, Simion; ANDRÉE, Birgit; CEBOTARI, Serghei; BOYLE, Erin C.; HAVERICH, Axel; HILFIKER, Andres (Springer Nature Switzerland, 2017)
    In this paper, we report on the interaction of multifunctional nanoparticles with living endothelial cells. The nanoparticles were synthesized using direct growth of gallium nitride on zinc oxide nanoparticles alloyed with ...
  • A SnS2-based photomemristor driven by sun 
    DRAGOMAN, Mircea; BATIRI, Mihail; DINESCU, Adrian; CIOBANU, Vladimir; RUSU, Emil; DRAGOMAN, Daniela; TIGINYANU, Ion (AIP Publishing LLC, 2018)
    We demonstrate experimentally that a sample of a SnS2 layered semiconductor compound with the area of 1 cm2 and the thickness of 100 μm, contacted laterally by silver electrodes with the area of 1 mm2, acts naturally as a ...
  • Electromagnetic interference shielding in X-band with aero-GaN 
    DRAGOMAN, Mircea; BRANISTE, Tudor; IORDANESCU, Sergiu; ALDRIGO, Martino; RAEVSCHI, Simion; SHREE, Sindu; ADELUNG, Rainer; TIGINYANU, Ion (IOP Publishing, 2019)
    We investigate the electromagnetic shielding properties of an ultra-porous lightweight nanomaterial named aerogalnite (aero-GaN). Aero-GaN is made up of randomly arranged hollow GaN microtetrapods, which are obtained by ...
  • Photoluminescence mechanisms of Tb3+ - doped porous GaP 
    ELHOUICHET, H.; OUESLATI, M.; LORRAIN, N.; LANGA, S.; TIGINYANU, I. M.; FÖLL, H. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2005)
    Porous GaP (por-GaP) samples are doped with terbium ions (Tb3+) by simple impregnation followed by high-temperature annealing. From scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis, we show ...
  • Photoluminescence study of CdTe/CdS solar cells grown from a source with Cu residual impurity 
    GHIMPU, L.; URSAKI, V. V.; POTLOG, T.; TIGINYANU, I. M. (IOP Publishing, 2005)
    Three photoluminescence (PL) bands centred at 1.30, 1.35 and 1.45 eV have been observed in the PL spectrum of CdTe/CdS thin film solar cells grown by close space sublimation (CSS) techniques from a source with Cu residual ...
  • Luminescent materials based on semiconductor compound templates for random laser applications 
    URSAKI, V. V.; TIGINYANU, I. M.; SIRBU, L.; ENACHI, M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    A survey of methods for the preparation of luminescent nanocomposite materials with the focus on random laser media on the basis of porous semiconductor and dielectric templates is presented. Media with controlled light ...
  • Self-induced oscillation of the macropore diameter in n-type silicon 
    COJOCARU, Ala; CARSTENSEN, Jürgen; LEISNER, Malte; FÖLL, Helmut; TIGINYANU, Ion (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    Electrochemical etching of n-type silicon in viscous-electrolyte containing HF for macropore formation has been employed to obtain deep pores at high growth rates. Under certain conditions, a new kind of macropore growth ...
  • Fabrication of photonic crystal circuits based on GaN ultrathin membranes by maskless lithography 
    VOLCIUC, Olesea; BRANISTE, Tudor; SERGENTU, Vladimir; URSAKI, Veaceslav; TIGINYANU, Ion M.; GUTOWSKI, Jürgen (Society of Photo-Optical Instrumentation Engineers, SPIE, 2015)
    We report on maskless fabrication of photonic crystal (PhC) circuits based on ultrathin (d~15 nm) nanoperforated GaN membranes exhibiting a triangular lattice arrangement of holes with diameters of 150 nm. Ultrathin GaN ...
  • Gold Electroplating as a Tool for Assessing the Conductivity of InP Nanostructures Fabricated by Anodic Etching of Crystalline Substrates 
    MONAICO, E. V.; TIGINYANU, I. M.; URSAKI, V. V.; NIELSCH, K.; BALAN, D.; PRODANA, M.; ENACHESCU, M. (The Electrochemical Society, 2017)
    Electroplating is shown to represent a simple and effective tool for assessing the conductivity of InP nanostructures fabricated by electrochemical etching of InP wafers. A mixture of nanowalls, nanowires and nanobelts was ...
  • Sensing up to 40atm Using Pressure-Sensitive Aero-GaN 
    DRAGOMAN, Mircea; CIOBANU, Vladimir; SHREE, Sindu; DRAGOMAN, Daniela; BRANISTE, Tudor; RAEVSCHI, Simion; DINESCU, Adrian; SARUA, Andrei; MISHRA, Yogendra K.; PUGNO, Nicola; ADELUNG, Rainer; TIGINYANU, Ion (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2019)
    This work reports on the fabrication and characterization of a robust pressure sensor based on aero-GaN. The ultraporous aeromaterial consists of GaN interconnected hollow micro-tetrapods with the wall thickness of about ...
  • Electron field emission from narrow band gap semiconductors InAs 
    LITOVCHENKO, V.; EVTUKH, A.; SEMENENKO, M.; GRYGORIEV, A.; YILMAZOGLU, O.; HARTNAGEL, H. L.; SIRBU, L.; TIGINYANU, I. M.; URSAKI, V. V. (IOP Publishing, 2007)
    We propose to use InAs for the development of effective electron field emitters on the basis of a new technological approach for the preparation of highly textured surfaces which allows one to obtain peculiar fine rod-like ...

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