Materials Literature
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The discovery of high-${T}_{c}$ superconductivity in the pnictides, materials with a Fermi surface determined by several bands, highlights the need to understand how superconductivity arises in multiband systems. In this effort, using symmetry considerations and mean-field approximations, we discuss how strong hybridi…
We have investigated the magnetic properties of molybdenum-doped (0–5 wt %) indium oxide films deposited on (100) MgO substrates using pulsed-laser deposition technique. Interestingly these films were found to reveal room-temperature ferromagnetism, where the magnetization increases with Mo doping. The maximum saturat…
We show that yield strength is determined by “thinness” i.e., by the smallest dimension of a structure. Compressing wall-like structures of different length to width ratio, using a NanoindenterXP, has allowed us to distinguish between proposed plasticity size effect theories by determining the dimensional dependence o…
Lamellar A(x)CoO(2) cobalt double oxides with A = Li, Na, and K (x approximately 0.6) have been synthesized and their chemical (alkali content, oxidation state, and structure) and physical (resistivity, thermopower, magnetization, and specific heat) properties have been studied. All the three materials exhibit strong…
SnTe-based films and superlattices (SLs) were prepared and their electrical properties were measured. A EuTe/SnTe SL exhibited a hole mobility of 2720 cm2/V s, which is the highest value reported for any semiconductor material at room temperature. The SnEuTe film also exhibited high hole mobility in contrast to the Pb…
Changes in the size distribution and composition of bimetallic Pd-Au nanoclusters have been observed after hydrogen exposure. This effect is caused by hydrogen-induced Ostwald ripening whereby the hydrogen reduces the binding energy of the cluster atoms leading to their detachment from the cluster. The composition cha…
A method to decorate single-walled and multiwalled carbon nanotubes (CNTs) with metal nanoparticles (NPs) based on the formation of a CNT polyelectrolyte is reported. Such a method does not rely on CNT surface functionalization or the use of surfactants. It has been tested for gold (Au) and palladium (Pd). The resulti…
The electronic structure and properties of pristine gold clusters Au n as well as the alkali-metal- and hydrogen-atom-doped clusters Au n −1 X, where n = 2−8 and X = Li, Na, and H, have been investigated. The dopant atoms are interesting from the perspective that they have similar outer electronic configuration in the…
The structural organization of iron oxide nanoparticles (NPs) obtained through in situ coprecipitation of iron salts in semi-interpenetrating polymer networks (semi-IPNs) constituted of alginate (Alg) and poly(N-isopropylacrylamide) (PNiPAAm) has been investigated by means of small-angle X-ray scattering and transmiss…
Surface-enhanced Raman scattering (SERS) has proven to be a powerful technique for a wide range of topics such as chemical analysis, materials research, and biological imaging. In this work, we report in detail on the development and characterization of micrometer-sized dielectric beads with metal colloids attached to…
In this work we report two simple approaches to prepare hybrid thin films displaying a high concentration of zeolite crystals that could be used as active layers in optoelectronic devices. In the first approach, in order to organize nanodimensional zeolite crystals of 40 nm diameter in an electroactive environment, we…
We designed and fabricated an all-dielectric metamaterial which exhibits negative index of refraction. This metamaterial consists of one layer made up of two sets of high permittivity resonators. We experimentally showed that this metamaterial exhibits resonant effective permeability and permittivity issued from the f…
We report the first experimental application of surface-enhanced Raman scattering (SERS) to the study of the structural phase transition of vanadium dioxide (VO2). Using arrays of gold-capped VO2 nanoparticles (Au+VO2 NPs) and a VO2 film covered with Au islands, we obtained the temperature evolution of the SERS intens…
The phase behavior of polystyrene- b -poly(methyl methacrylate) (PS- b -PMMA) copolymers of various molecular weights has been studied by using small-angle X-ray scattering (SAXS) and depolarized light scattering (DLS). The empirical Flory χ, determined from scattering intensity profiles for a fully disordered PS- b -…
Zigzag-edged graphene nanoribbons (ZGNRs) are used to build devices in which transport with high spin polarization is realized by first-principles simulations. At first, we dope the semiconducting ZGNRs with B atoms on both sides to obtain a metallic ribbon. Then, in one segment of this ribbon which acts as the scatte…
Abstract A new, simple route leading to layered rare‐earth hydroxy nitrates was developed. The pH‐independent procedure uses ethanol containing alkali‐metal hydroxide (KOH, RbOH, or CsOH) as a solvothermal medium. Two new, layered rare‐earth hydroxy nitrates (LRHs), Nd 2 (OH) 5 NO 3 · n H 2 O and La 2 (OH) 5 NO 3 · n…
Sr 2 Si 5 N 8 : Eu 2 + , one of the most recently developed phosphors for use in white light emitting diodes, exhibits a two-peak emission. Namely, the emission band of Sr2Si5N8:Eu2+ is deconvoluted into two Gaussian peaks irrespective of the Eu2+ concentration. We examined the two-peak emission of Sr2Si5N8:Eu2+ by an…
A novel synthetic route to peptide-capped gold nanoparticles was demonstrated herein. Tetrachloroaurate ions were reduced with 2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid (HEPES) under extremely mild conditions (pH 7.2, ambient temperature) in the presence of cysteine-terminal desired peptides, so that pep…
We studied photocarrier recombination processes in highly excited SrTiO3 crystals using pump-probe transient absorption (TA) and photoluminescence (PL) spectroscopy at room temperature. TA signals of nondoped SrTiO3 crystals clearly appear in the visible and infrared spectral region under intense interband photoexcita…
BACKGROUND: Application of superparamagnetic iron oxide nanoparticles (SPIOs) as the contrast agent has improved the quality of magnetic resonance (MR) imaging. Low efficiency of loading the commercially available iron oxide nanoparticles into cells and the cytotoxicity of previously formulated complexes limit their u…