Materials Literature
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Structural properties of zinc oxide nanoparticles are theoretically studied focusing on the effects induced by the surfaces. In this aim, we compare two models: an atomistic and an elastic model. Atomistic model uses a semiempirical potential: the shell model. Effects of surface relaxation and surface stress are taken…
We have grown Bi2Sr2Co2Oy thin films on LaAlO3 (100) and fused silica substrates by pulsed laser deposition. The films on LaAlO3 are c-axis oriented and partially in-plane aligned with multiple domains, while the films on fused silica are preferred c-axis oriented without in-plane alignment. The Seebeck coefficient an…
We have investigated the thermoelectric properties of alloys of composition CoSi1−xGex for 0≤x≤0.5. These alloys display Seebeck coefficient in the range of −80 to −100 μV K−1 at room temperature. Despite the rather high Seebeck coefficients, the electrical resistivity of these alloys is metallic in nature. Alloying o…
Epitaxial SmCo5 thin films with strong perpendicular magnetic anisotropy have been developed by pulsed laser deposition on heated Ru buffered Al2O3(0001) substrates. Pole figure measurements on thicker films reveal the existence of two epitaxial variants, 30° in-plane rotated to each other, which reduces to a single e…
Three new complex salts Na(2)[Fe(II)(CN)(5)(L)] [L = N-methyl-4-{E,E-4-(4-pyridyl)buta-1,3-dienyl}pyridinium, N-methyl-4-{E,E,E-6-(4-pyridyl)hexa-1,3,5-trienyl}pyridinium, or N-methyl-1,4-bis-{E-2-(4-pyridyl)ethenyl}] benzene have been prepared. These compounds have been characterized by using various techniques inclu…
Abstract Single‐crystal hexagonal pyramids of zinc blende ZnS are fabricated by facile thermal evaporation in an ammonia atmosphere at 1150 °C. It is found that ZnS pyramids grow along the [111] crystal axis and possess a sharp tip with a diameter of ∼10 nm and a micrometer‐sized base. The structural model and growth…
The purpose of this article is to present the design and capabilities of two in situ scanning electron microscope (SEM) indentation instruments covering a large load range from microN to N. The capabilities and advantages of in situ SEM indentation are illustrated by two applications: indentation of a thin film and a…
The dielectric properties of single-phase BiFeO3 (BFO) thin films were investigated based on parallel-plate electrode (PPE) and coplanar interdigital electrode (CIE) configurations across a wide frequency range of 100 Hz–10 GHz. The dielectric dispersion in the PPE configuration, caused by the interfacial polarization…
The valence and conduction band structures of In2O3 have been measured using a combination of valence band x-ray photoemission spectroscopy, O K-edge resonant x-ray emission spectroscopy, and O K-edge x-ray absorption spectroscopy. Excellent agreement is noted between the experimental spectra and O 2p partial density…
Co and Al co-doped ZnO diluted magnetic semiconductors are fabricated by a pulsed laser deposition and their electronic structure is investigated using x-ray absorption and emission spectroscopy. The Zn(0.895)Co(0.100)Al(0.005)O thin films grown under oxygen-rich conditions exhibit ferromagnetic behavior without any i…
Quartz-binding peptides (QBPs) are used as both ink and linker for microcontact printing and self-assembly, for the co-immobilization of streptavidin-coated quantum dots and fluorescein. Directed assembly of the quantum dots is carried out following microcontact printing of biotinylated QBP1 on a quartz surface. The r…
Treating freshly prepared cerous hydroxide with hydrogen peroxide (H 2 O 2 ) under ambient conditions provides a facile and efficient way for converting CeO 2 nanoparticles (∼22 nm, 37 m 2 /g) into nanowires of fine diameters (down to ∼5 nm) and outstanding specific surface areas (∼184 m 2 /g). The CeO 2 nanomaterials…
In this study, we report for the first time the fabrication of polymer nanospheres, nanocapsules, and hemispherically capped nanorods simply through the wetting of anodic aluminum oxide (AAO) membranes with polymer solutions. For the wetting with polystyrene solutions, we have demonstrated that the formation of nanoro…
A new method of protein detection was explored on the resonant Raman scattering signal of ZnO nanoparticles. A probe for the target protein was constructed by binding the ZnO/Au nanoparticles to secondary protein by eletrostatic interaction. The detection of proteins was achieved by an antibody-based sandwich assay. A…
The role of nanotwin lamellae in enhancing thermal stability of nanostructured materials is examined. Nanostructured copper with varying densities of twins was generated by controlling the deformation strain rate during severe plastic deformation at cryogenic temperatures. While the nanostructured materials produced u…
Gold nanoparticles are used as a luminescent contrast agent to study size-dependent dynamics in polymer matrix. The experiments measured the diffusion coefficient of particles in poly(butyl methacrylate) melt by tracking their motion within a diffraction-limited focus of a laser with 150 fs pulses at 800 nm. Our resul…
Abstract The kinetics of point‐defect association/dissociation reactions in Ce 0.8 Gd 0.2 O 1.9 and their influence on the crystal lattice parameter are investigated by monitoring thermally induced stress and strain in substrate‐ and self‐supported thin films. It is found that, in the temperature range of 100–180 °C,…
High aspect ratio BaTiO(3) nanotube arrays with single crystal structure were fabricated by the hydrothermal method at low temperature (150 degrees C). Numerous structure study methods, including x-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), electron paramagnetic resonance (EPR),…
Water-soluble silsesquioxane nanoparticles (NPs) incorporating viologen groups (PXV; 1,1'-bis[3-(trimethoxysilyl)propyl]-4,4'-bipyridinium iodide) have been synthesized by sol-gel polymerization. The electrochromic properties of the bulk film fabricated by layer-by-layer (LbL) assembly have been examined, along with t…
Single crystals of diamond up to 18 mm in thickness have been grown by microwave plasma assisted chemical vapor deposition at gas pressures of up to 350 torr. Growth rates of up to 165 μm/h at 300 torr at high power density have been achieved. The processes were evaluated by optical emission spectroscopy. The high-qua…