Materials Literature
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We studied the effect of ion damage on the properties of 50 keV Ga+ focused ion beam fabricated lead-zirconate-titanate capacitors as a function of the ion dose. We observed significant modification in the chemical composition of the damaged layer due to loss of lead and oxygen, and gallium impurity accumulation. The…
A nanosized decacopper(II) cluster complex was synthesized using p-tert-butylthiacalix[6]arene as a ligand. In the complex, the calixarene assumes a "pinched cone" conformation and acts as an undecadentate ligand via six phenoxy oxygen and five sulfur atoms. The resulting pentacopper(II) subunits are connected by two…
The p-type GaN epilayers were prepared by metalorganic chemical vapor deposition and subsequently Mn+ ions implanted. The properties of Mn+ ions-implanted GaN epilayers were investigated by optical and magnetic measurements. The results of photoluminescence measurement show that optical transitions related to Mn appar…
A lamellar-structured crystalline polypyrrole (PPy) supramolecular assembly was prepared by surfactant templating, and the regularly linked amorphous PPy nanoparticles with tunable window sizes could play the role of crystalline lattices in the supramolecular assembly.
The electronic and magnetic structure of bulk NiO and the NiO(100) surface is calculated using density-functional theory (DFT) in the local-spin-density (LSD) approximation including self-interaction corrections. We calculate the exchange coupling constants in bulk NiO and at the NiO(100) surface and show that in the…
In this letter, we report the observation of ultraviolet light-induced change of excited charge-transfer band in nanocrystalline Y2O3:Eu3+, which is attributed to the rearrangements of local environments surrounding the Eu3+ ions in the near surface of nanoparticles.
In this article, we observe the optically pumped lasing from the high-quality nanocrystalline ZnO thin films obtained by thermal oxidation of ZnS thin films, which were grown on SiO2 substrates by low-pressure-metalorganic chemical vapor deposition technique. The x-ray diffraction (XRD) patterns indicate that high-qua…
Using the local-density approximation, calculating the Hellmann-Feynman forces, and applying the direct method, the phonon-dispersion relations of cubic austenite, trigonal R, orthorhombic and monoclinic martensitic phases of the NiTi intermetallic compound have been derived. In the austenite phase we have found a sof…
In this work, the stationary and time-resolved electroluminescence (EL) properties of Si quantum dots embedded within a metal–oxide–semiconductor device are investigated. In particular, we measured the excitation cross section of Si nanocrystals under electrical pumping, finding a value of 4.7×10−14 cm2 which is two o…
Experimental frequency-dependent conductivity relaxation spectra of a number of molten, glassy, and crystalline ionic conductors that show both the presence of the near constant loss (NCL) and the cooperative ion hopping contribution are analyzed. On decreasing frequency, the NCL appears first but terminates at some f…
Dynamic light scattering (DLS) and rheological measurements were performed on aqueous silk fibroin solutions extracted from the middle division of Bombyx mori silkworm over a wide range of polymer concentration C from 0.08 to 27.5 wt %. DLS results obtained in the dilute region of C less than 1 wt % are consistent wit…
In this paper, we investigate the low frequency Raman spectra of multiwalled carbon nanotubes (MWNT's) prepared by the electric arc method. Low frequency Raman modes are unambiguously identified on purified samples thanks to the small internal diameter of the MWNT's. We propose a model to describe these modes. They or…
We have studied the adsorption of Hg atoms onto gold and silver nanoparticles by optical spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and energy-dispersive X-ray analysis. Mercury adsorption induces a blue shift of the surface plasmon mode of gold and silver nanoparticles. Two tren…
In the present study, x-ray diffraction, Raman spectroscopy, spectroscopic ellipsometry, photoluminescence, and x-ray photoelectron spectroscopy techniques were used to study the effect of 120 MeV Ag9+107 ion irradiation on nanocrystalline Cu2O thin films grown by the activated reactive evaporation technique. The infl…
We show that a layered material, with alternating layers having negative permittivity (ε<0) and negative permeability (μ<0), responds to electromagnetic fields in many ways like a homogeneous left-handed material with ε<0 and μ<0. In particular, such a layered structure supports electromagn…
Electron-beam-induced deposition (EBID) is performed with multiwalled carbon nanotube emitters that are assembled to atomic force microscope cantilevers through nanorobotic manipulations. A typical experiment shows that under 120 V bias, field emission current 2 μA occurs from a nanotube emitter. In comparison with co…
We present results for electronic transport measurements on large three-dimensional arrays of CdSe nanocrystals. In response to a step in the applied voltage, we observe a power-law decay of the current over five orders of magnitude in time. Furthermore, we observe no steady-state dark current for fields up to ${10}^{…
Electromigration in on-chip Cu interconnections with a selective electroless metal coating, CoWP, CoSnP, or Pd, on the top surface of Cu damascene lines has been investigated. The 10–20 nm thick metal cap significantly improves electromigration lifetime by providing protection against interface diffusion of Cu which h…
We report herein the mechanism of the photochemical ligand substitution reactions of a series of fac-[Re(X(2)bpy)(CO)(3)(PR(3))](+) complexes (1) and the properties of their triplet ligand-field ((3)LF) excited states. The reason for the photostability of the rhenium complexes [Re(X(2)bpy)(CO)(3)(py)](+) (3) and [Re(X…
The nature of liquid structures with their changing behaviors remains an unsolved fundamental problem in many fields of science and technology. It has been widely accepted that liquid structures change gradually with temperature and/or pressure. With x-ray diffraction in the melt In-Sn80, however, we have confirmed th…