Browsing by Subject "Nitrides"

Article

Ab-initio electronic structure calculations and properties of [SixSn1 − x]3N4 ternary nitrides

Pavloudis, T.; Zervos, Matthew; Komninou, P.; Kioseoglou, J. (2016)

We carry out ab initio electronic structure calculations of (SixSn1 − x)3N4 using density functional theory with projector augmented-wave potentials under the generalized gradient approximation. We find that the energetically ...

Article

Adaptive VN/Ag nanocomposite coatings with lubricious behavior from 25 to 1000 °c

Aouadi, S. M.; Singh, D. P.; Stone, D. S.; Polychronopoulou, K.; Nahif, F.; Rebholz, Claus; Muratore, C.; Voevodin, A. A. (2010)

A two-phase nanocomposite coating that consists of inclusions of silver in a vanadium nitride matrix (VN/Ag) was investigated as a potential adaptive coating with a reduced friction coefficient from 25 to 1000 °C. This ...

Article

Carrier relaxation dynamics in SnxNy nanowires grown by chemical vapor deposition

Othonos, A.; Zervos, Matthew (2009)

Carrier relaxation dynamics in tin nitride (SnxNy) nanowires have been investigated using femtosecond transient absorption spectroscopy. The nanowires were grown directly on quartz using chemical vapor deposition and had ...

Article

Effect of silicon nitride/oxide on the structure and the thermal conductivity of CoSi nanocomposites

Ioannou, M.; Delimitis, A.; Symeou, E.; Giapintzakis, John; Kyratsi, Theodora (2017)

In this work, the fabrication of nanocomposites with silicon nitride/oxide into the thermoelectric matrix of cobalt silicide is presented. The different concentrations of nano-Si3N4 were intentionally introduced by mechanical ...

Article

Enhanced growth and photoluminescence properties of SnxN y (x>y) nanowires grown by halide chemical vapor deposition

Zervos, Matthew; Othonos, A. (2011)

Tin nitride nanowires have been grown by halide chemical vapor deposition via the reaction of Sn with NH4Cl at 425 °C under a steady flow of NH3 using small ramp rates y) with a hexagonal structure, i.e. c=5.193 , a=3.725 ...

Article

Few-step synthesis, thermal purification and structural characterization of porous boron nitride nanoplatelets

Kostoglou, N.; Lukovic, J.; Babic, B.; Matovic, B.; Photiou, D.; Constantinides, G.; Polychronopoulou, K.; Ryzhkov, V.; Grossmann, B.; Mitterer, C.; Rebholz, Claus (2016)

Hexagonal boron nitride (h-BN) nanoplatelets with 99 wt.% purity, 900 to 2000 nm particle width, 30 to 90 nm particle thickness, 213 m2/g specific surface area (SSA), 66% micropore SSA and 0.85 nm average pore size were ...

Article

Influence of polarization field on the lasing properties of III-nitride quantum wells

Dialynas, G. E.; Deligeorgis, G.; Zervos, Matthew; Pelekanos, N. T. (2006)

A theoretical investigation of the effect of polarization-induced fields on the optoelectronic properties of a 3 nm In0.2Ga0.8N/GaN single quantum well has been carried out via a self-consistent solution of Schrödinger-Poisson ...

Article

Low temperature growth of In 2O 3 and InN nanocrystals on Si(111) via chemical vapour deposition based on the sublimation of NH 4Cl in In

Zervos, Matthew; Tsokkou, D.; Pervolaraki, M.; Othonos, A. (2009)

Indium oxide (In 2O 3) nanocrystals (NCs) have been obtained via atmospheric pressure, chemical vapour deposition (APCVD) on Si(111) via the direct oxidation of In with Ar:10% O 2 at 1000 °C but also at temperatures as low ...

Article

The nitridation of ZnO nanowires

Zervos, Matthew; Karipi, C.; Othonos, A. (2012)

ZnO nanowires (NWs) with diameters of 50 to 250 nm and lengths of several micrometres have been grown by reactive vapour transport via the reaction of Zn with oxygen on 1 nm Au/Si(001) at 550°C under an inert flow of Ar. ...

Article

Plasma-based surface engineering processes for wear and corrosion protection

Matthews, A.; Leyland, A.; Dorn, B.; Stevenson, P. R.; Bin-Sudin, M.; Rebholz, Claus; Voevodin, A.; Schneider, J. (1995)

Vacuum plasma-based coating and treatment methods have considerable potential for reducing wear and corrosion. However, they have not been widely applied to engineering components other than tools such as those used in ...

Article

Synthesis of Tin nitride Sn xN y nanowires by chemical vapour deposition

Zervos, Matthew; Othonos, A. (2009)

Tin nitride (Sn xN y) nanowires have been grown for the first time by chemical vapour deposition on n-type Si(111) and in particular by nitridation of Sn containing NH 4Cl at 450 °C under a steady flow of NH 3. The Sn xN ...

Article

A systematic study of the nitridation of SnO 2 nanowires grown by the vapor liquid solid mechanism

Zervos, Matthew; Othonos, A. (2012)

SnO 2 nanowires (NWs) with diameters of 50 nm and lengths ≥10 μm have been grown at 800 °C on 1.0 nm Au/Si(001) via the vapor liquid solid mechanism and the low pressure chemical vapor deposition. These exhibited clear ...

Article

Textured VN coatings with Ag3VO4 solid lubricant reservoirs

Luster, B.; Stone, D.; Singh, D. P.; Baben, M. to; Schneider, J. M.; Polychronopoulou, K.; Rebholz, Claus; Kohli, P.; Aouadi, S. M. (2011)

Silver oxovanadate powders were produced using a low temperature hydrothermal synthesis method. X-ray diffraction (XRD) and Raman microscopy revealed the formation of the α-Ag3VO4 phase, and differential scanning calorimetry ...

Article

Thermal and chemical stability of hexagonal boron nitride (h-BN) nanoplatelets

Kostoglou, N.; Polychronopoulou, K.; Rebholz, Claus (2015)

High-temperature properties of boron nitride platelets (200-800 nm in width and 30-50 nm in thickness) were systematically evaluated through thermogravimetric analysis (TGA) in combination with differential scanning ...

Article

Tribological properties of twin electron-beam evaporated Cr-N and Al-Cr-N coatings under laboratory sliding and drill experiments

Polychronopoulou, K.; Demas, N. G.; Rebholz, Claus; Polycarpou, A. A. (2008)

The tribological behavior of substoichiometric Cr-N and Al-Cr-N coatings prepared by twin electron-beam evaporation at 450°C was studied. Al-Cr-N coatings with Al to Cr ratios in the range of 1-8 (and nitrogen concentrations ...

Article

Zn3N2nanowires: Growth, properties and oxidation

Zervos, Matthew; Karipi, C.; Othonos, A. (2013)

Zinc nitride (Zn3N2) nanowires (NWs) with diameters of 50 to 100 nm and a cubic crystal structure have been grown on 1 nm Au/Al2O3via the reaction of Zn with NH3including H2between 500°C and 600°C. These exhibited an optical ...