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Browsing Articole din publicaţii internaţionale by Author "TIGINYANU, Ion"

Browsing Articole din publicaţii internaţionale by Author "TIGINYANU, Ion"

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  • 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 ...
  • GaN versus ZnO: Growth, properties and applications 
    TIGINYANU, Ion (Academica Greifswald, 2017)
    GaN and ZnO are wide band gap semiconductor compounds with unique properties favourable for the development of short-wavelength light emitting devices and high-power electronics. From the point of view of applications, ...
  • 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 ...
  • Highly Porous and Ultra-Lightweight Aero-Ga2O3: Enhancement of Photocatalytic Activity by Noble Metals 
    PLESCO, Irina; CIOBANU, Vladimir; BRANISTE, Tudor; URSAKI, Veaceslav; RASCH, Florian; SARUA, Andrei; RAEVSCHI, Simion; ADELUNG, Rainer; DUTTA, Joydeep; TIGINYANU, Ion (MDPI, 2021)
    A new type of photocatalyst is proposed on the basis of aero-β-Ga2O3, which is a material constructed from a network of interconnected tetrapods with arms in the form of microtubes with nanometric walls. The aero-Ga2O3 ...
  • The impact of nanoperforation on persistent photoconductivity and optical quenching effects in suspended GaN nanomembranes 
    VOLCIUC, Olesea; BRANISTE, Tudor; TIGINYANU, Ion; STEVENS-KALCEFF, Marion A.; EBELING, Jakob; ASCHENBRENNER, Timo; HOMMEL, Detlef; URSAKI, Veaceslav; GUTOWSKI, Jürgen (AIP Publishing LLC, 2013)
    We report on fabrication of suspended ~15 nm thick GaN membranes nanoperforated in an ordered fashion using direct writing of negative charges by focused ion beam and subsequent photoelectrochemical etching of GaN epilayers. ...
  • Improving gas sensing by CdTe decoration of individual Aerographite microtubes 
    STROBEL, Julian; GHIMPU, Lidia; POSTICA, Vasile; LUPAN, Oleg; ZAPF, Maximilian; SCHÖNHERR, Sven; RÖDER, Robert; RONNING, Carsten; SCHÜTT, Fabian; MISHRA, Yogendra Kumar; TIGINYANU, Ion; ADELUNG, Rainer; MARX, Janik; FIEDLER, Bodo; KIENLE, Lorenz (IOP Publishing Ltd, 2018)
    Novel gas sensors have been realized by decorating clusters of tubular Aerographite with CdTe using magnetron sputtering techniques. Subsequently, individual microtubes were separated and electrically contacted on a SiO2/Si ...
  • Individual CdS-covered aerographite microtubes for room temperature VOC sensing with high selectivity 
    GHIMPU, Lidia; LUPAN, Oleg; POSTICA, Vasile; STROBEL, Julian; KIENLE, Lorenz; TERASA, Maik-Ivo; MINTKEN, Mona; TIGINYANU, Ion; MARX, Janik; FIEDLER, Bodo; ADELUNG, Rainer (ELSEVIER, 2019)
    The synthesis of new nanomaterials with a large surface-to-volume ratio is of high interest for sensing applications, and especially for gas sensors with high performances. In this work, a thin layer of CdS is deposited ...
  • Injection photodiodes based on metal oxide semiconductors 
    MORARI, Vadim; URSAKI, Veacheslav; RUSU, Emil; TIGINYANU, Ion (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2020)
    A brief review of our recent research on injection photodiodes based on metal oxide semiconductors deposited onto Si substrates is presented. A series of ZnSnO, NiO, and Zn1-xMgxO thin films are prepared by aerosol spray ...
  • Integration of individual TiO2 nanotube on the chip: Nanodevice for hydrogen sensing 
    ENACHI, Mihail; LUPAN, Oleg; BRANISTE, Tudor; SARUA, Andrei; CHOW, Lee; MISHRA, Yogendra K.; GEDAMU, Dawit; ADELUNG, Rainer; TIGINYANU, Ion (WILEY-VCH Verlag GmbH \&Co. KGaA, Weinheim, 2015)
    Titania (TiO2) exists in several phases possessing different physical properties. In view of this fact, we report on three types of hydrogen sensors based on individual TiO2 nanotubes (NTs) with three different structures ...
  • Large-Sized Nanocrystalline Ultrathin β-Ga2O3 Membranes Fabricated by Surface Charge Lithography 
    CIOBANU, Vladimir; CECCONE, Giacomo; JIN, Irina; BRANISTE, Tudor; YE, Fei; FUMAGALLI, Francesco; COLPO, Pascal; DUTTA, Joydeep; LINNROS, Jan; TIGINYANU, Ion (MDPI (Basel, Switzerland), 2022)
    Large-sized 2D semiconductor materials have gained significant attention for their fascinating properties in various applications. In this work, we demonstrate the fabrication of nanoperforated ultrathin β-Ga2O3 membranes ...
  • 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 ...
  • Light-Induced Motion of Microengines Based on Microarrays of TiO2 Nanotubes 
    ENACHI, Mihail; GUIX, Maria; POSTOLACHE, Vitalie; CIOBANU, Vladimir; FOMIN, Vladimir M.; SCHMIDT, Oliver G.; TIGINYANU, Ion (Wiley-VCH GmbH, Weinheim, 2016)
    An electrochemical approach for manufacturing light-driven nanostructured titanium dioxide (TiO2) microengines with controlled spatial architecture for improved performance is reported. The microengines based on microscale ...
  • Membrane-assisted revelation of the spatial nanoarchitecture of dislocation networks 
    TIGINYANU, Ion; POPA, Veaceslav; STEVENS-KALCEFF, Marion A. (ELSEVIER, 2011)
    We propose a method of direct visualization of the spatial nanoarchitecture of dislocation networks which is based on etching away the regions with low density of structural defects from the bulk of GaN epilayers, keeping ...
  • Memristive GaN ultrathin suspended membrane array 
    DRAGOMAN, Mircea; TIGINYANU, Ion; DRAGOMAN, Daniela; BRANISTE, Tudor; CIOBANU, Vladimir (IOP Publishing, 2016)
    We show that ultrathin GaN membranes, with a thickness of 15 nm and planar dimensions of 12 × 184 μm2, act as memristive devices. The memristive behavior is due to the migration of the negatively-charged deep traps, which ...
  • Mesenchymal stem cells proliferation and remote manipulation upon exposure to magnetic semiconductor nanoparticles 
    BRANISTE, Tudor; COBZAC, Vitalie; ABABII, Polina; PLESCO, Irina; RAEVSCHI, Simion; DIDENCU, Alexandru; MANIUC, Mihail; NACU, Viorel; ABABII, Ion; TIGINYANU, Ion (ELSEVIER, 2020)
    In this paper, we report on spatial redistribution of bone marrow mesenchymal stem cells loaded with magnetic nanoparticles under the influence of continuously applied magnetic field. Semiconductor nanoparticles were ...
  • Metallized Porous GaP Templates for Electronic and Photonic Applications 
    TIGINYANU, Ion; MONAICO, Eduard; SERGENTU, Vladimir; TIRON, Andrei; URSAKI, Veaceslav (IOP Publishing, 2014)
    We report on fabrication of two-dimensional metallo-semiconductor networks by using pulsed electroplating of Pt inside electrochemically-prepared porous GaP layers with parallel pores possessing diameters in the micrometer ...
  • Micro-Raman study of columnar GaAs nanostructures 
    PRUNICI, Pavel; IRMER, Gert; MONECKE, Jochen; SIRBU, Lilian; TIGINYANU, Ion (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2005)
    Micro-Raman scattering spectra of bulk and porous GaAs and of individual nanocolumns were studied. The GaAs nanocolumns have radii of 50–100 nm and lengths between 5 and 25 µm. The experimental data are compared with the ...
  • Modulation of Electrical Conductivity and Lattice Distortions in Bulk HVPE-Grown GaN 
    WOLFF, Niklas; JORDT, Philipp; BRANISTE, Tudor; POPA, Veaceslav; MONAICO, Eduard; URSAKI, Veaceslav; PETRARU, Adrian; ADELUNG, Rainer; MURPHY, Bridget M.; KIENLE, Lorenz; TIGINYANU, Ion (The Electrochemical Society, 2019)
    The nature of self-organized three-dimensional structured architectures with spatially modulated electrical conductivity emerging in the process of hydride vapor phase epitaxial growth of single crystalline n-GaN wafers ...
  • 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 ...
  • Multifunctional device based on ZnO:Fe nanostructured films with enhanced UV and ultra-fast ethanol vapour sensing 
    POSTICA, Vasile; HÖLKEN, Iris; SCHNEIDER, Viktor; KAIDAS, Victor; POLONSKYI, Oleksandr; CRETU, Vasilii; TIGINYANU, Ion; FAUPEL, Franz; ADELUNG, Rainer; LUPAN, Oleg (ELSEVIER, 2016)
    Extensive application requests on high-performance gas sensors and photodetectors reveal the importance of controlling semiconducting oxide properties. Sensing properties of ZnO nano- and micro-structures can be tuned and ...

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