Materials Literature
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A PbS quantum dots (QDs) fiber amplifier was fabricated and characterized by using a standard single mode fiber (SMF) coupler. The fiber amplifier was fabricated by coating PbS QDs doped sol-gel films onto the tapered SMF coupler. Through the evanescent wave, the PbS quantum dots were excited. With a 980 nm wavelength…
A rod−coil diblock copolymer (DCP) containing an oligo(phenylene vinylene) (OPV) rigid block and a polystyryl-type flexible block with polyoxometalate (POM) clusters as side chain pendants has been successfully synthesized. The coil block of 2,6-dimethyl-4-vinyl aniline protected by phthalic anhydride was prepared by…
Epitaxial BiFeO3 films pulsed laser deposited on SrTiO3, Nb:doped SrTiO3, and DyScO3 were studied using variable angle spectroscopic ellipsometry, vacuum ultraviolet ellipsometry, micro-Raman spectroscopy, and x-ray diffraction. The energy band gap of the film deposited on DyScO3 is 2.75 eV, while the one for the film…
We investigated the structural and optical properties of Eu-doped ZnO thin films made by sol-gel technique and magnetron reactive sputtering on Si (100) substrate. The films elaborated by sol-gel process are polycrystalline while the films made by sputtering show a strongly textured growth along the c-axis. X-ray diff…
Determination of accurate behavior of nanostructures is important in nanoelectromechanical systems in view of the shortcoming of classical theories of mechanics. In this study size-dependent transverse vibration of nanoplates is investigated. Surface properties which include surface elasticity and residual stresses ar…
The promising potential of a RAD-16 self-assembly-peptide hydrogel as a scaffold for tissue-engineered cartilage was investigated. Within 3 weeks of in vitro culture, chondrocytes within the hydrogel produced a high amount of GAG and type-II collagen, which are the components of cartilage-specific extracellular matrix…
The formation of native point defects in cuprous oxide, Cu2O, synthesized from solution has been studied by first-principles calculations. Although p-type conduction is obtained in Cu2O synthesized from vacuum regardless of copper-rich or oxygen-rich conditions, intrinsically n-type Cu2O without doping can be grown in…
We present a combined experimental and theoretical study on the rotational motion of the ${({\text{BH}}_{4})}^{\ensuremath{-}}$ ions in alkaline tetrahydroborides $M{\text{BH}}_{4}$, $M=(\text{Li},\text{Na},\text{K})$. The ${\text{BH}}_{4}$ motions are thermally activated and characterized by activation energies in th…
We perform molecular dynamics simulations to investigate the shock response of idealized hexagonal columnar nanocrystalline Cu, including plasticity, local shear, and spall damage during dynamic compression, release, and tension. Shock loading (one-dimensional strain) is applied along three principal directions of the…
We have prepared thin films of BiFe1−xZrxO3 (x=0.0–0.15) by chemical solution deposition on Pt/Si substrates. Structural characterization of the films using x-ray diffraction and Raman spectroscopy suggests lattice distortion upon doping for x<0.15. This also appears to be the limit for pure phase formation. Fe…
In this report, we have studied the stability of various crystallographic phases of (1−x)BiFeO3–xPbTiO3 as a function of composition and temperature. The structure of BF-xPT is reconfirmed to be tetragonal and monoclinic in the P4mm and Cc space groups for x>0.31 and 0.10≤x≤0.27, whereas the two phases coexist…
Nickel ferrite thin films were synthesized by pulsed laser deposition. It was determined that the monotonic increase in saturation magnetization and the non-monotonic increase in electrical conductivity depend on the oxygen partial pressure during the growth of the thin films. A substantial reduction in magnetization…
Colloidal gelation is caused by the formation of a percolated network of colloidal particles suspended in a liquid. Thus far the major transport process leading to gelation has been believed to be the brownian diffusion of particles. Contrary to this common belief, we reveal by numerical simulations that many-body hyd…
We calculated the electronic structures and the thermoelectric properties for type-I and type-VIII Ba8Ga16Sn30 (BGS) clathrates. The band structures show that type-I and type-VIII BGS are indirect semiconductors with band gaps of 0.51 eV and 0.32 eV, respectively. The calculated Seebeck coefficient of n-type type-I BG…
Responsive lanthanide complexes demonstrate differentiated modulated luminescence output upon exposure to metal di-cations in aqueous solution.
The usability of nanostructures in electrical devices such as gas sensors critically depends on the ability to form high quality contacts and junctions, at least in a two terminal setup. For the fabrication of various nanostructures, vapor−liquid−solid (VLS) growth is meanwhile a widely spread and very efficient techn…
A combined small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) study was conducted to investigate the structural characteristics of aqueous (D 2 O) solution of generation 7 and 8 (G7 & G8) polyamidoamine (PAMAM) dendrimer as a function of molecular protonation. A consequent change in the intr…
Bis(iminophosphoranyl)methanide ({CH(PPh 2 NR)} −, R = i Pr or Ph) neodymium(III) complexes were prepared from NdI 3 (THF) 3.5 . The steric bulk of the ligand controlled the stoichiometry of the resulting complexes. Thus, three new complexes, bearing one or two ancillary ligands, were prepared and characterized using…
Ageneral methodology towards stable high-performance photocontrollable organic thin-film transistors (OTFTs) by using photochromic spiropyrans (SP) combined with polymethyl methacrylate (PMMA) as a photoactive gate dielectric is reported. Capacitance and mobility transitions are demonstrated theoretically and experime…
Hot electronic dynamics in lead sulfide nanocrystals is interrogated by degenerate pump-probe spectroscopy with 20-25 fs pulses over a broad frequency range around three times the nanocrystal band gap. For each nanocrystal diameter, an initial reduction in absorption is seen only at the peak of the quantum confined E1…