Materials Literature
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Surface-emitting diode lasers containing a second-order Bragg grating with a central phaseshift, Δφ, of values around π are found to fundamentally favor lasing in a mode of symmetric near-field amplitude profile, which in turn provides emission in a single-lobed beam orthonormal to the surface. Devices of 500 μm long…
Highly (100) oriented Ba0.9Sr0.1TiO3/LaNiO3 heterostructures have been grown on Si(100) using chemical solution routes. X-ray diffraction analysis shows that Ba0.9Sr0.1TiO3 thin films are high (100) orientation (α100=0.92). Atomic force microscopy investigation shows that they have large grains about 80–200 nm. A Pt/B…
We perform an investigation of ion-beam mixing in the immiscible system Ag–Cu based on cross-sectional transmission electron microscopy. Multilayered samples consisting of ten periods of (6.7 nm Cu/11.2 nm Ag) are irradiated at temperatures ranging from 25 to 225 °C with normally incident 1 MeV Kr ions to doses in the…
The nucleation and growth of Cd 1- x Zn x S and CdS x Se 1- x nanocrystals in borosilicate glass are investigated through optical absorption and resonant Raman scattering measurements. The optical absorption spectra are interpreted with the help of a quantized-state effective-mass model applied for heterogeneous and h…
The excitonic states of four small hydrogenated Si clusters $({\mathrm{SiH}}_{4},{\mathrm{Si}}_{2}{\mathrm{H}}_{6},{\mathrm{Si}}_{5}{\mathrm{H}}_{12},$ and ${\mathrm{Si}}_{10}{\mathrm{H}}_{16})$ are studied using the diffusion quantum Monte Carlo approach. The importance of using accurate guiding wave functions is str…
A large-area image capture device using an organic sensor is reported. The 512×512 pixel array, with 100×100 micrometer pixel size, combines amorphous silicon matrix addressing with a continuous organic sensor. The bilayer sensor comprises a tetraphenyldiamine hole transport layer on top of a benzimidazole perylene ge…
Thin films (9 μm) of polyvinylidene fluoride (PVDF) are irradiated by swift heavy ions (180 MeV Ag14+) in the fluence range 1×1010–1×1012ions/cm2 with an electronic linear energy transfer LET∼11 keV/nm. In sharp contrast to the previous results, the most characteristic crystalline asymmetric and symmetric “CH2” double…
Bi 4 Ti 3 O 12 , (BTO) a Bi-layered perovskite oxide, shows fatigue after repeated ferroelectric polarization reversals. On the other hand, Bi3.25La0.75Ti3O12 (BLT) is fatigue free. From an extensive transmission electron microscopy study, it was found that there is a high density of antiphase boundaries (APBs) in BLT…
The adsorption of potassium on the Cu(111) surface in a 2x2 pattern has been simulated with all-electron full-potential density functional calculations. The top site is found to be the preferred adsorption site, with the other highly symmetric adsorption sites being nearly degenerate. The bond length from potassium to…
We investigate, using the noise reduction technique, the asymptotic universality class of the well-studied nonequilibrium limited mobility atomistic solid-on-solid surface growth models introduced by Wolf and Villain (WV) and Das Sarma and Tamborenea (DT) in the context of kinetic surface roughening in ideal molecular…
When a bidentate ligand L-L is added to the square planar Ni(tmhd)(2) (tmhd = tetramethylhepanedionate), the octahedral complex Ni(tmhd)(2)L-L is formed. This reaction has been studied by vis spectroscopy in toluene at 25 degrees C and in the gas phase between 150 and 350 degrees C. It allows the comparison on one han…
N 2 adsorption in the internal nanospace and on the external suface of the single SWNH particle is studied by grand canonical Monte Carlo simulation and is compared with the experimental result. The detailed comparison of the simulated adsorption isotherm with the experimental isotherm in the internal nanospaces provi…
The structure of hyperbranched aromatic polyamides synthesized from different ratios of p -phenylenediamine and trimesic acid (A 2 + B 3 reagent pair) has been investigated by means of 1 H and 13 C NMR spectroscopy. On the basis of a detailed NMR signal assignment six 1,3,5-trisubstituted benzene moieties with differe…
The thermal stability and decomposition products of hexabromocyclododecane (HBCD), a widely used aliphatic brominated flame retardant, were investigated. HBCD thermal degradation was carried out in nitrogen and in air at moderate heating rates (10 °C/min) using thermogravimetric analyzers and a laboratory-scale fixed-…
We have prepared a diluted system of Co 3 O 4 nanocrystals dispersed in nonmagnetic SiO 2 by heating an MCM-41 molecular sieve soaked in 0.075 mol/L CoCl 2 aqueous solution in flowing oxygen at 300 °C for 3 h. Transmission electron microscopy showed that fine particles of about 3 nm exhibiting the (220) and (331) latt…
We evaluated the spectral properties of four stilbene derivatives containing the boronic acid group [−B(OH) 2 ]:stilbene-4-boronic acid (STBA), 4‘-cyanostilbene-4-boronic acid (CSTBA), 4‘-methoxystilbene-4-boronic acid (MSTBA), and 4‘-(dimethylamino)stilbene-4-boronic acid (DSTBA). The emission spectrum of DSTBA displ…
Based on electronic structure calculations, we have found that noble metal diborides, AgB2 and AuB2, are potential candidates for conventional BCS-type high temperature superconductors. B 2p density of states dominates at the Fermi level in comparison with Ag 4d and Au 5d states. Furthermore, the electron-phonon coupl…
The influence of polydispersity on liquid-crystalline ordering in anisotropic polymer brushes is considered. It is shown that mixing of long and short chains in a brush inhibits LC ordering of long chains; LC ordering is influenced by details of the inner structure of a brush rather than by its global average characte…
Research on diblock copolymer thin films has been devoted primarily toward understanding and controlling microstructural and topographical features at temperatures below the order–disorder transition (ODT), where ordered phase separated structures exist. Recently, we showed that the topography of thin liquid diblock f…
The low-temperature electronic spectra of Pr3+ at an octahedral site of symmetry in the PrCl63− moiety, in crystals of Cs2NaPrCl6, Cs2LiPrCl6, and Cs2NaMCl6:Pr(M=Gd, Y) have been measured and interpreted. Together with the results from d–f emission spectra and resonance electronic Raman spectra, these new data permitt…