Articole din publicaţii internaţionale: Recent submissions

  • 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 ...
  • Surface charge lithography for GaN micro- and nanostructuring 
    TIGINYANU, Ion M.; POPA, Veaceslav; SARUA, Andrei; HEARD, Peter J.; VOLCIUC, Olesea; KUBALL, Martin (Society of Photo-Optical Instrumentation Engineers, SPIE, 2009)
    We demonstrate the possibility for controlled micro- and nanostructuring of GaN layers by low-dose focusedion-beam (FIB) treatment with subsequent photoelectrochemical (PEC) etching. The proposed novel maskless approach ...
  • Novel phosphors based on porous materials 
    TIGINYANU, I. M.; URSAKI, V. V.; SIRBU, L.; ENAKI, M.; MONAICO, E. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    Technological conditions have been developed for the preparation of nanocomposite phosphors based on porous InP, GaP and GaAs semiconductor as well as Al2O3 and TiO2 dielectric templates doped with rare earth and transition ...
  • Ultrafast third-order optical nonlinearity in SnS2 layered compound for photonic applications 
    PETRIS, Adrian; GHEORGHE, Petronela S.; VLAD, Valentin I.; RUSU, Emil; URSAKI, Veaceslav V.; TIGINYANU, Ion M. (ELSEVIER, 2018)
    The ultrafast nonlinear optical response of SnS2 layered compound, excited by high-repetition-rate ultrashort (fs) pulses at 1550 nm wavelength, is investigated for the first time by optical third harmonic generation. In ...
  • Flexible pressure sensor based on graphene aerogel microstructures functionalized with CdS nanocrystalline thin film 
    PLESCO, Irina; DRAGOMAN, Mircea; STROBEL, Julian; GHIMPU, Lidia; SCHÜTT, Fabian; DINESCU, Adrian; URSAKI, Veaceslav; KIENLE, Lorenz; ADELUNG, Rainer; TIGINYANU, Ion (ELSEVIER, 2018)
    In this paper, we report on functionalization of graphene aerogel with a CdS thin film deposited by magnetron sputtering and on the development of flexible pressure sensors based on ultra-lightweight CdS-aerogel nanocomposite. ...
  • Electrical characterization and cathodoluminescence microanalysis of AlN/GaN heterostructures 
    HUBBARD, S. M.; PAVLIDIS, D.; VALIAEV, V.; STEVENS-KALCEFF, M. A.; TIGINYANU, I. M. (ELSEVIER, 2002)
    Low-pressure MOCVD is used to grow AlN/GaN MIS-type heterostructures with AlN thickness between 3 and 35 nm. The two-dimensional electron gas (2DEG) Hall mobility was found to decrease with AlN thickness. The measured room ...
  • Superlensing with plane plates consisting of dielectric cylinders in glass envelopes 
    FOCA, E.; SERGENTU, V. V.; DASCHNER, F.; TIGINYNAU, I. M.; URSAKI, V. V.; KNÖCHEL, R.; FÖLL, H. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    The approach of designing negative-refractive-index materials on the basis of dielectric rods with a gradient of the dielectric constant is tested experimentally. A triangular-lattice plane-parallel slab assembled from ...
  • Filiform Nanostructure Technologies Based on Microwire Stretching 
    IOISHER, A. M.; BADINTER, E. Ya.; POSTOLACHE, V.; MONAICO, E. V.; URSAKI, V. V.; SERGENTU, V. V.; TIGINYANU, I. M. (American Scientific Publishers, 2012)
    A technological route allowing one to integrate huge amounts of electrically isolated metal, semiconductor, or semimetal nanowires in glass fibers with the diameter of up to a few hundreds of micrometers is presented, and ...

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