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Non polar ZnO and (Zn, Co)O layers were successfully grown on (11̄02) sapphire (R-plane sapphire). The growth process was shown to directly influence the surface morphology as well as the strain state in (112̄0) ZnO (A-plane ZnO). The dominant defect lines seen in photoluminescence were due to...
We report on the high-pressure pulsed-laser deposition growth of periodic arrays of free-standing single zinc oxide nanowires with uniform hexagonal arrangement and cross-section with thickness of less than 100 nm. In order to achieve the wire alignment, we prepared an ordered array of catalytic...
Quantum size effect (QSE) and very efficient laser action were observed in ZnO-mesoporous CMI-1 silica nanocomposites prepared through the incorporation of ZnO nanoparticles inside the channels of a silica mesoporous material CMI-1. The incorporation was made by direct impregnation of the...
A new theory of undercooling has been developed based on the Fickian form of heat flux expressed in terms of a gradient in enthalpy density. It is shown that heat diffusion is more fundamental than Fourier’s law of heat conduction. During the solid–liquid phase change, diffusion requires...
As-grown ZnO bulk crystals and crystals annealed in vacuum, oxygen, or zinc vapour were characterized by electrical, optical and magnetic resonance spectroscopy. The experiments show that the residual carrier concentration is caused by residual H, Al, Ga and oxygen vacancies (V O ) in the...
ZnO nanorods were grown by a near-room-temperature, simple, chemical solution method on large-area Zn foils and substrate materials such as silicon, and zinc oxide thin films on silicon and glass. Study of the ZnO nanorods on the different substrates by electron microscopy methods shows that the...
Epitaxial ZnO thin films on sapphire substrates can be used as fast and laterally homogeneous scintillators to convert electrons into photons, for example for imaging purpose. We report on the improvement of the cathodoluminescence intensity of epitaxial pulsed laser deposited ZnO films on...
In the frame of studying II–VI oxides of interest in optoelectronic technologies, the structural properties of CdO films grown by metalorganic vapour phase epitaxy on a-plane sapphire substrates have been analysed. The study has been performed by means of X-ray diffraction and cross-sectional...
Lead-free piezoelectric ceramics with the formula 0.90(Bi 0.5 Na 0.5 )TiO 3 - 0.05(Bi 0.5 K 0.5 )TiO 3 - 0.015(Bi 0.5 Li 0.5 )TiO 3 -0.05BaTiO 3 (abbreviated as BNKLBT-1.5) were prepared by a conventional mixed-oxide method. A disc of this material was fabricated and used to construct an...
We have used oxygen plasma assisted metal organic chemical vapor deposition along with wet chemical synthesis and spin coating to prepare Co x Zn 1-x O and Mn x Zn 1-x O epitaxial and nanoparticle films. Co(II) and Mn(II) substitute for Zn(II) in the wurtzite lattice in materials synthesized by...
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