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Browsing by Subject "Thin films"

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    • Article  

      Ambiguous Role of Growth-Induced Defects on the Semiconductor-to-Metal Characteristics in Epitaxial VO2/TiO2 Thin Films 

      Mihailescu, C. N.; Symeou, E.; Svoukis, E.; Negrea, R. F.; Ghica, C.; Teodorescu, V.; Tanase, L. C.; Negrila, C.; Giapintzakis, John (2018)
      Controlling the semiconductor-to-metal transition temperature in epitaxial VO2 thin films remains an unresolved question both at the fundamental as well as the application level. Within the scope of this work, the effects ...

    • Article  

      Analytical separations using molecular micelles in open-tubular capillary electrochromatography 

      Kapnissi‐Christodoulou, Constantina P.; Akbay, C.; Schlenoff, J. B.; Warner, I. M. (2002)
      Open-tubular capillary electrochromatography (OT-CEC) is an alternative approach to conventional CEC. The primary advantage of OT-CEC is the elimination of problems associated with frits and silica particles in conventional ...

    • Article  

      Comparison of free surface polarization of NiMnSb and Co2 MnSi 

      Miyoshi, Y.; Bugoslavsky, Y.; Syed, M. H.; Robinson, T.; Cohen, L. F.; Singh, L. J.; Barber, Z. H.; Grigorescu, C. E. A.; Gardelis, S.; Giapintzakis, John; Roy, W. Van (2006)
      We present a systematic study of the polarization of the transport current from a variety of NiMnSb and Co2 MnSi thin films and bulk material using point contact Andreev reflection spectroscopy. The simple analysis suggests ...

    • Article  

      Correlation of elastic modulus, hardness and density for sputtered TiAlBN thin films 

      Rebholz, Claus; Leyland, A.; Matthews, A.; Charitidis, C.; Logothetidis, S.; Schneider, D. (2006)
      This paper describes the correlation between the elastic modulus, hardness and density of mainly X-ray amorphous TiAlxByNz (0.29 ≤ x ≤ 1.32

    • Article  

      Data storage applications based on LiCoO2 thin films grown on Al2O3 and Si substrates 

      Svoukis, E.; Mihailescu, C. N.; Mai, V. H.; Schneegans, O.; Breza, K.; Lioutas, C.; Giapintzakis, John (2015)
      In this study, LiCoO2 thin films were investigated for data storage applications based on scanning probe mediated approaches. LiCoO2, compared to other materials proposed for scanning probe mediated nanoscale patterning, ...

    • Article  

      Deposition and nanotribological characterization of Sub-100-nm thick protective Ti-based coatings for miniature applications 

      Polychronopoulou, K.; Lee, J.; Tsotsos, C.; Demas, N. G.; Meschewski, R. L.; Rebholz, Claus; Polycarpou, A. A. (2011)
      Ti-based protective thin films with thicknesses below 100 nm, intended for miniature applications were deposited using physical vapor deposition magnetron sputtering. X-ray diffraction (XRD), scanning electron microscopy, ...

    • Conference Object  

      Electron microscopy study of thermoelectric (BixSb1-x)2Te3thin film 

      Breza, A.; Lioutas, C. B.; Giapintzakis, John (Springer Science and Business Media, LLC, 2015)
      In the present work, transmission electron microscopy (TEM) techniques were used in order to study the morphology and investigate the structural properties of a (BixSb1-x)2Te3(BST) thin film. The sample was fabricated on ...

    • Article  

      Ellipsometric analysis of ion-implanted polycrystalline silicon films before and after annealing 

      Lioudakis, Emmanouil E.; Nassiopoulou, Androula Galiouna; Othonos, Andreas S. (2006)
      A study of arsenic ion-implanted polycrystalline silicon films before and after annealing at various temperatures has been performed using spectroscopic ellipsometry in the ultraviolet to the visible spectral region. Using ...

    • Article  

      Ellipsometry on optically thin palladium films on silicon-based substrate: Effects of low concentration of hydrogen 

      Lioudakis, Emmanouil E.; Othonos, Andreas S. (2005)
      Optically thin palladium films evaporated on silicon substrates are investigated following exposure to low concentrations of hydrogen gas in nitrogen using spectroscopic ellipsometry. Changes in the parameters tan Ψ and Δ ...

    • Article  

      Femtosecond carrier dynamics of Inx Ga1-x N thin films grown on GaN (0001): Effect of carrier-defect scattering 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Iliopoulos, Eleftherios; Tsagaraki, K.; Georgakilas, A. (2007)
      Ultrafast carrier dynamics in ultrathin Inx Ga1-x N ternary alloys were investigated in detail, using femtosecond transient differential optical absorption measurements. Measurements were performed with probing wavelengths ...

    • Article  

      Growth and structural characterization of orthorhombic and tetragonal SrCuO2 thin films 

      Mihailescu, C. N.; Pasuk, I.; Athanasopoulos, G. I.; Luculescu, C.; Socol, M.; Saint-Martin, R.; Revcolevschi, A.; Giapintzakis, John (2013)
      Epitaxial SrCuO2 thin films were grown on (0 0 1) SrTiO 3 substrates by pulsed laser deposition using a stoichiometric target. X-ray diffraction indicated that the SrCuO2 films undergo a structural phase transition as a ...

    • Article  

      Growth and transport properties of HT-Li xCoO 2 thin films deposited by pulsed laser deposition 

      Svoukis, E.; Athanasopoulos, G. I.; Moradpour, A.; Schneegans, O.; Revcolevschi, A.; Giapintzakis, John (2012)
      The successful in situ growth of single phase, c-axis oriented, layered structured Li xCoO 2 thin films on (0 0 0 1) Al 2O 3 substrates by pulsed laser deposition is reported. Thin films were grown in an oxygen pressure ...

    • Doctoral Thesis  Open Access

      Growth by pulsed laser deposition and characterization of transition metal oxide thin films for potential use in novel applications 

      Σβούκης, Ευθύμιος Χ. (Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2015-05)
      Η τεχνολογία αιχμής χρειάζεται νέα «εξωτικά» υλικά που θα μπορούσαν να χρησιμοποιηθούν στην περαιτέρω σμίκρυνση των ηλεκτρονικών κυκλωμάτων καθώς και την αύξηση των λειτουργιών τους. Τα οξείδια μετάλλων μετάπτωσης απέκτησαν ...

    • Article  

      Growth of polycrystalline LaNi 1-xCo xO 3 (x = 0.3, 0.5) thin films on Si(100) by pulsed laser deposition 

      Androulakis, J.; Klini, A.; Manousaki, A.; Violakis, G.; Giapintzakis, John (2004)
      Polycrystalline LaNi 1_xCo xO 3 (x = 0.5, 0.3) thin films have been deposited on polished Si(lOO) substrates by pulsed laser deposition. The films are grown at 650°C in ambient oxygen pressure of 0.4 mbar with an incident ...

    • Article  

      Hall effect study of magnetoresistive perovskite LaNi0.5Co 0.5O3 thin films 

      Androulakis, J.; Giapintzakis, John (2004)
      We report on the Hall effect of LaNi0.5Co0.5O 3 magnetoresistive thin films grown on Si(100) substrates by pulsed laser deposition. The Hall resistivity exhibits sign reversals both in varying magnetic field and temperature, ...

    • Article  

      High-resolution quadrature photopyroelectric spectroscopy of a-Si:H thin films deposited on silicon wafers 

      Shen, Jun; Mandelis, Andreas; Othonos, Andreas S.; Vanniasinkam, Joseph (1995)
      The recently developed photothermal technique of quadrature photopyroelectric spectroscopy (Q-PPES) has been applied to measurements of amorphous Si thin films deposited on crystalline Si substrates. Direct, meaningful ...

    • Article  

      Hybrid inorganic/organic semiconductor heterostructures with efficient non-radiative energy transfer 

      Heliotis, G.; Itskos, Grigorios; Murray, R.; Dawson, M. D.; Watson, I. M.; Bradley, D. D. C. (2006)
      A hybrid inorganic/organic semiconductor structure employing a polyfluorene thin films with Efficient non-radiative Förster resonant energy transfer (FRET) was fabricated. FRET is mediated by dipole-dipole interactions, ...

    • Article  

      Hybrid polaritons in strongly coupled microcavities: Experiments and models 

      Lidzey, D. G.; Wenus, J.; Whittaker, D. M.; Itskos, Grigorios; Stavrinou, P. N.; Bradley, D. D. C.; Murray, R. (2004)
      We describe the fabrication of one-dimensional quantum microcavities containing two different layers of molecular J-aggregates. We show that strong coupling can occur between the confined cavity photon mode and the two ...

    • Article  

      Influence of grain size on ultrafast carrier dynamics in thin nanocrystalline silicon films 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Nassiopoulou, Androula Galiouna; Lioutas, Ch B.; Frangis, N. (2007)
      The ultrafast carrier dynamics in thin nanocrystalline silicon films (10 and 20 nm thick) on quartz over a broad spectral range using optical pumping at a moderate fluence of 2.5 mJ cm2 were studied. The films were composed ...

    • Article  

      Investigations on the self propagating reactions of nickel and aluminum multilayered foils 

      Gunduz, Ibrahim Emre; Fadenberger, K.; Kokonou, Maria; Rebholz, Claus; Doumanidis, C. C. (2008)
      The self-propagating reaction of nickel-aluminum thin film multilayers with a bilayer thickness of 43 nm was investigated using high-speed optical camera and infrared thermometry. The results indicate a two-stage reaction ...

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