Materials Literature
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Optical absorption and emission experiments were used to characterize defects and defect aggregates in Mg-doped Al2O3 crystals due to thermochemical reduction at high temperatures. Oxygen vacancies and higher-order defects are produced much more readily in Mg-doped than in undoped Al2O3 crystals. F+ and F centers (oxy…
A study was initiated to understand requirements for widening and flattening the gain spectra of tellurite-based glasses for their application as new gain media for photonic devices. For this purpose, two Raman active components, WO3 and P2O5, were added either separately or jointly to a TeO2-BaO-SrO-Nb2O5 (TBSN) glas…
Structural and magnetic properties of the compounds ${({\mathrm{Co}}_{x}{\mathrm{Ni}}_{1\ensuremath{-}x})}_{1.5}[\mathrm{Fe}{(\mathrm{C}\mathrm{N})}_{6}]∙z{\mathrm{H}}_{2}\mathrm{O}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}1)$ have been studied by x-ray and neutron-diffraction, dc magnetization, infrared (IR),…
Abstract The poly(styrene‐ co ‐octavinyl‐polyhedral oligomeric silsesquioxane) (PS–POSS) organic–inorganic hybrid nanocomposites containing various percent of POSS were prepared via one‐step free radical polymerization and characterized by FTIR, high‐resolution 1 H NMR, 29 Si NMR, GPC, DSC, and TGA technologies. The P…
Thermopower and electrical conductivity of sodium-doped vanadium pentoxide (V2O5) thin films synthesized by a solution technique were investigated. An aqueous solution based V2O5 thin film is a good candidate for thin film devices using ink-jet deposition and screen printing techniques. To improve its thermoelectric p…
A simple wet-chemical in situ reduction method has been developed for the synthesis of shape-tunable gold nanoparticles (GNPs) using 1,4,8,11-tetraazacyclotetradecane (cyclam) as a reducing-cum-stabilizing agent. The growth of different shaped GNPs occurred at ambient temperature in the absence of any added stabilizer…
The optical properties of electrodeposited Zn-ZnO structures annealed at different temperature in oxygen ambient are studied. Zn and ZnO coexist in all samples measured by x-ray diffraction, but only ZnO is observed for a sample annealed at 800 °C. From photoluminescence analyses, green and orange-red emissions are ob…
Polyhedral oligosilsesquioxane (POSS)-containing amphiphilic poly(vinyl alcohol) (PVA) hybrids (PVA−POSS hybrids) were synthesized by urethane linkage between the hydroxyl groups of PVA and the monoisocyanate group of POSS macromers. The hydrophobicity of the amphiphilic PVA−POSS hybrids was varied by changing the inc…
The deactivation of the two lowest excited states of Ho3+ was investigated in Ho3+ singly doped and Ho3+, Pr3+-codoped fluoride (ZBLAN) glasses. We establish that 0.1–0.3mol% Pr3+ can efficiently deactivate the first excited (I75) state of Ho3+ while causing a small reduction of ∼40% of the initial population of the s…
High-quality faceted nanocrystals and triangular nanoplates of copper sulfide have been successfully synthesized by using the single source precursor method in the presence of oleylamine. The obtained faceted copper sulfide nanocrystals have an average size of 9.8 ± 0.3 nm, showing the regularly hexagonal closely pack…
X-ray magnetic circular dichroism (XMCD) measurements and density functional theory (DFT) are used to study the electronic conduction states in Gd5(Ge(1-x)Si(x))4 materials through the first-order bond-breaking magnetostructural transition responsible for their giant magnetocaloric effect. Spin-dependent hybridization…
We fabricated single-crystalline MgO nanowires epitaxially grown on MgO single crystal substrate using the Au catalyst-assisted pulsed laser deposition (PLD). Controlling appropriately the amount of Au catalyst and the substrate temperature was found to be crucial for the MgO nanowire growth using the catalyst-assiste…
A wide range of amorphous hydrogenated silicon nitride thin films with an excess of silicon was prepared by evaporation of silicon under a flow of nitrogen and hydrogen ions. A strong visible photoluminescence at room temperature was observed for the as-deposited films as well as for films annealed up to 1100°C. The c…
In this paper we report the structural, electrical, and optical properties of epitaxial Zn1−xGaxO films (x=0–0.05) grown on single crystal sapphire (0001) substrate by pulsed laser deposition technique. Structural and elemental analysis was performed using high-resolution x-ray diffraction (θ-2θ and Φ scan) and energy…
This letter describes a model of the anisotropy of crystalline ferromagnetic alloys containing defect clusters. The focus is on ⟨100⟩-type pairs in bcc lattices each of which is assigned a uniaxial anisotropy of fixed magnitude. The lattice is also characterized by a coherent anisotropy energy due to the transition el…
Single-crystalline silver nanobelts larger than 10 μm in length, 60−100 nm in width, and 30−40 nm in thickness were synthesized facilely in aqueous solutions under the direction of poly(acrylic acid) at 4 °C. With the addition of acetic acid to the solution, unique hierarchical silver nanocolumns consisting of stacked…
Abstract Precursor of polyimide, polyamic acid has been prepared sucessfully. Acid‐modified carbon nanotube (MWCNT) was grafted with soluble polyimide then was added to the polyamic acid and heated to 300 °C to form polyimide/carbon nanotube composite via imidation. Morphology, mechanical properties and electrical res…
A comparison study has been conducted on the formation of catalyst nanoparticles on a high surface tension metal and low surface tension oxide for carbon nanotube (CNT) growth via catalytic chemical vapor deposition (CCVD). Silicon dioxide (SiO2) and tantalum have been deposited as supporting layers before deposition…
Raman spectra of ZnO powders and thin films obtained during exposure to hydrogen at different concentrations, temperatures, and electrochemical conditions indicated two distinct effects of hydrogen on the defect structure of the oxide. At lower concentrations of hydrogen in a gaseous environment at approximately 400°C…
CdSe nanocrystals (NCs) were obtained from cadmium sulfate and sodium selenosulfate in aqueous gelatin solutions. A near-bandgap emission of CdSe NCs was noticeably enhanced after passivation with CdS or ZnS. Resonant Raman scattering spectra of the passivated NCs revealed new peaks attributed to the formation of the…