Articole din publicaţii internaţionale: Recent submissions

  • GaN nanostructuring for the fabrication of thin membranes and emerging applications 
    TIGINYANU, Ion; URSAKI, Veaceslav (TUBITAK, 2014)
    We present a review of technological methods developed in recent years for the purpose of gallium nitride nanostructuring, with the main focus on fabrication of thin GaN membranes. In particular, we report on traditional ...
  • Renormalization of the Coulomb Law in an Amorphous System of Metallic Nanospheres and Its Impact on the Electronic Subsystem 
    SERGENTU, V. V.; URSAKI, V. V.; TIGINYANU, I. M. (American Scientific Publishers, 2014)
    We demonstrate relations between the renormalization of the Coulomb interaction in a disordered system of metallic nanospheres and the changes induced by this renormalization in the spectrum of the electronic subsystem of ...
  • 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 ...
  • Multilayer porous structures on GaN for the fabrication of Bragg reflectors 
    BRANISTE, Tudor; MONAICO, Eduard; MARTIN, Denis; CARLIN, Jean-François; POPA, Veaceslav; URSAKI, Veaceslav V.; GRANDJEAN, Nicolas; TIGINYANU, Ion M. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2017)
    We report on the development of electrochemical etching technology for the production of multilayer porous structures (MPS) allowing one to fabricate Bragg reflectors on the basis of GaN bulk substrates grown by Hydride ...
  • Hierarchical Aerographite 3D flexible networks hybridized by InP micro/nanostructures for strain sensor applications 
    PLESCO, Irina; STROBEL, Julian; SCHÜTT, Fabian; HIMCINSCHI, Cameliu; BEN SEDRINE, Nabiha; MONTEIRO, Teresa; CORREIA, Maria Rosário; GORCEAC, Leonid; CINIC, Boris; URSAKI, Veaceslav; MARX, Janik; FIEDLER, Bodo; MISHRA, Yogendra Kumar; KIENLE, Lorenz; ADELUNG, Rainer; TIGINYANU, Ion (Springer Nature Limited, 2018)
    In the present work, we report on development of three-dimensional flexible architectures consisting of an extremely porous three-dimensional Aerographite (AG) backbone decorated by InP micro/nanocrystallites grown by a ...
  • Porous InP as Piezoelectric Component in Magneto-Electric Composite Sensors 
    GERNGROSS, Mark-Daniel; SPRINCEAN, Veaceslav; LEISNER, Malte; CARSTENSEN, Jürgen; FÖLL, Helmut; TIGINYANU, Ion (The Electrochemical Society, 2011)
    We report on the fabrication of cheap piezoelectric porous InP templates by electrochemical etching and additional purely chemical post-etching and on the galvanic filling of the resulting nanopore array with Ni-Fe using ...
  • Ultra-Thin GaN Membranes Fabricated by Using Surface Charge Lithography 
    TIGINYANU, Ion; POPA, Veaceslav; STEVENS-KALCEFF, Marion A. (The Electrochemical Society, 2019)
    We report on fabrication of ultra-thin GaN membranes of nanometer scale thickness, by using the concept of surface charge lithography based on low-energy ion treatment of the sample surface with subsequent photoelectrochemical ...
  • 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 ...

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