Facultatea de Fizică şi Inginerie / Faculty of Physics and Engineering

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Subject: search.filters.subject.nanowires

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    Micro and nanocomposites of gallium oxides and chalcogens as radiation receivers and gas sensors [Articol]
    (Editura USM, 2024) Sprincean, Veaceslav; Caraman, Mihail
    By thermal treatment (TT) in water vapor atmosphere at 750 ℃ and 900 ℃ of β-GaS and εGaSe single-crystalline wafers, Ga2S3/Ga2Se3 - GaS/GaSe and β-Ga2O3 - GaSe/GaSe layers formed by nanowires and nanopangles photosensitive in the far Ultra-Violet (UVC) region were obtained. The electrical conductivity of β-Ga2O3 layer on GaS/GaSe substrate increases under the influence of water vapor. The link between the relative humidity of water vapor in the atmosphere and the electrical conductivity of the β-Ga2O3 layer was established.
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    Photoluminescence study of Eu-doped Ga2O3 and GaN nanowires and nanoparticles produced by hydrothermal growth [Articol]
    (Editura "Tehnica-UTM", 2015-05-20) Rusu, Emil; Ursachi, Veaceslav; Culeac, Ion; Raevschi, Simion; Vlazan, Paulina
    We present results on preparation of Eu doped GaN nanoparticles and nanowires on the basis of Ga2O3 nanomaterial produced by hydrothermal growth. The monoclinic Ga2O3 nanoparticles and nanowires have been prepared with gallium nitrate and sodium hydroxide as precursors. nanomaterial produced by hydrothermal growth. The monoclinic Ga2O3 nanoparticles and nanowires have been prepared with gallium nitrate and sodium hydroxide as precursors. The geometrical form on the nanomaterial is determined by the duration of the hydrothermal process. The Ga2O3 nanomaterial is transformed unto GaN nanoparticles and nanowires by nitridation in a flow of NH3 and H2. The photoluminescence properties Eu doped Ga2O3 and GaN nanomaterial are investigated under pulsed and continuum wave excitation. The produced material is also investigated by means of XRD analysis, Raman scattering and Fourier transform infrared (FTIR) spectroscopy.
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    Current trends in nanomaterials for metal oxide-based conductometric gas sensors: Advantages and limitations. part 1: 1D and 2D nanostructures [Articol]
    (MDPI, 2020) Korotcenkov, Ghenadii
    This article discusses the main uses of 1D and 2D nanomaterials in the development of conductometric gas sensors based on metal oxides. It is shown that, along with the advantages of these materials, which can improve the parameters of gas sensors, there are a number of disadvantages that significantly limit their use in the development of devices designed for the sensor market.
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    Structura și compoziția elementară a stratului de Ga2O3 pe substrat de Ga2O3 [Articol]
    (CEP USM, 2019) Sprincean, Veaceslav
    Nanoformațiunile din cristalite monofazice cu rețea cristalină monoclinică de oxid Ga2O3 au fost cercetate folosind imaginile suprafeței SEM, diagramele XRD, spectrele de difuzie combinată Raman și spectrele EDS. Oxidul Ga2O3 a fost sintezat prin călire în atmosfera normală a monocristalelor Ga2S3. La temperaturi de călire de 1070 K și 1170 K se obține un strat omogen compus din nanocristalite de Ga2O3 cu rețea cristalină monoclinică. Stratul de oxid de la suprafața eșantionului conține un surplus de oxigen și de sulf. Concentrația sulfului în unitate de arie de Ga2O3 se micșorează de la 0,13% at. până la 0,05% at. odată cu majorarea temperaturii de călire de la 970 K la 1170 K