Materials Literature
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The structural characteristics of the ZnO film grown on sapphire substrate using a thin MgO buffer layer were studied using transmission electron microscopy and high-resolution x-ray diffraction. The growth was carried out in a modified plasma-molecular beam epitaxy system. The observed misfit dislocations were well c…
Transformation of the electrical transport from the Efros and Shklovskii [J. Phys. C 8, L49 (1975)] variable range hopping to the “hard gap” resistance was experimentally observed in a low temperature range as the Fe compositions in Zn1−xFexO1−v ferromagnetic semiconductor films increase. A universal form of the resis…
Photoluminescence (PL) from purified (>90%) double-wall carbon nanotubes (DWNTs), which have been synthesized by zeolite catalyst-supported chemical vapor deposition (zeolite-CCVD), of very small diameters (0.8-nm average inner tube) is reported. The PL contour mappings for various ratios (1-90%) of double- versus sin…
Explosive boiling and lift-off of a thin layer of micron-sized transparent water droplets from an absorbing Si substrate heated by a nanosecond KrF laser were studied using a contact photoacoustic technique. The compressive photoacoustic response increases steeply to an asymptotic value on the order of the water criti…
PURPOSE: A noninvasive method to monitor intratumoral Doxil delivery in individual patients during targeted tumor therapy is important to predict treatment response. The purpose of this study was to determine if a small tracer dose of technetium-99m (99mTc)-labeled liposomes could be used to quantify the effect of loc…
${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ thin films about $1000\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ thick were grown on ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ (0001) by pulsed laser deposition. The x-ray diffraction analysis is in agreement with the $R\text{\ensuremath{-}}3c$ space group. Some of them exhibit the metal/i…
We report a detailed theoretical modeling of lattice thermal conductivity in nanoscale AlN∕GaN∕AlN heterostructures. Thermal conductivity in such heterostructures is derived based on the solution of the phonon Boltzmann equation in the relaxation-time approximation. Phonon dispersion relations are obtained in the elas…
The origin of the charge ordering in organic compounds $\theta$-(BEDT-TTF)$_2 X$ ($X=MM'$(SCN)$_4$, $M=$Tl,Rb,Co, $M'=$Cs,Zn) is studied using an extended Hubbard model. Calculating the charge susceptibility within random phase approximation (RPA), we find that the $(3\times 3)\sim (3\times 4)$ charge ordering observe…
Polyhedral oligomeric silsesquioxane (POSS) meets increasing interest as a building unit for inorganic-organic hybrid materials. The incorporation of cyclopentyl-substituted POSS (CpPOSS) into polystyrene (PS) thin films led to an inhibition of dewetting. In this paper, the dispersion state of CpPOSS in the CpPOSS/PS…
The transport and magnetic properties have been investigated in Nd0.7Sr0.3MnO3 nanoparticles prepared by the sol-gel method. The resistivity (ρ) increases with the decrease of the particle size due to the enhancement of the grain boundary effect. ρ(T) shows two distinct transitions for all the samples such as metal-in…
The optical properties of ZnO nanorods realized by an advanced low-temperature aqueous chemical growth on both silicon and plastic substrates are presented. Systematic photoluminescence investigations in the temperature range of 4–293K reveal strong and well-resolved near-band-edge emission even for rods on plastic su…
It is shown that the surface photovoltage produced by the photoinjected carriers in a layer can be split up into two contributions: total amount of charge, and distance between the centers of charge of the positive and negative carriers. This fact allows us to extract information directly about spatial charge separati…
The CaCu3Ti4O12 (CCTO) films with single- and double-sided CaTiO3 (CTO) buffer layers were grown on Pt∕Ti∕SiO2∕Si substrates by pulsed laser deposition at 650°C, which was lower than the normal deposition temperature of the CCTO films. The CTO layer was used as seeding layer to improve the crystallization of the CCTO…
We report the direct observation of the temperature-dependent potential barriers in the insulating grain boundary regions responsible for the positive temperature coefficient of resistivity phenomena observed in polycrystalline (n-type) doped barium titanate. Electric force imaging using atomic force microscopy was ca…
A series of layered perovskites ${\mathrm{Sr}}_{2}M{\mathrm{O}}_{4}$ ($M=\mathrm{Ti}$, V, Cr, and Mn) is studied by ab initio calculations within generalized gradient approximation (GGA) and $\mathrm{GGA}+U$ schemes. The total energies in different magnetic configurations, including the nonmagnetic, ferromagnetic, the…
We report on preparation and systematic study of the structural, magnetic, and electrical transport properties of Ge1−xMnx (x=25%–42%) alloy thin films grown on GaAs (001) substrates by molecular beam epitaxy. Amorphous Ge1−xMnx, and coexistence of amorphous Ge1−xMnx, Ge crystallites, and high TC secondary phases (Mn1…
Hexanuclear CuII-complexes of formula PPN[Cu6(micro3-O)2(micro-4-Rpz)6(micro-4-R'-3,5-Ph2pz)3] have been structurally characterized and the effect of pyrazole substituents on their two consecutive one-electron oxidation processes, leading to (possibly delocalised) mixed-valent products, has been probed by cyclic volta…
The $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ (001) surface structure with ferroelectric (FE) polarization parallel to the surface and its response to tangential strain have been studied using ab initio density functional theory calculations with the local density approximation. We find [110]-oriented ferroelectricity…
We report a heat treatment of catalyst in air that drastically enhances a growth of carbon nanotubes (CNTs) by means of thermal chemical vapor deposition (CVD). An Fe catalyst film deposited on a Si substrate was heat treated at 700°C in air before the acetylene CVD. The growth rate of the CNTs grown with the heat tre…
The rough pyramidal gold nanostructures fabricated by a one-step, nontemplated, low-cost electrochemical deposition, combined with a perfluorodecanethiol coating and, more importantly, the very large fraction of air trapped into the gold film, create a super-amphiphobic surface.