Materials Literature
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The development of ZnO-based semiconductor devices requires band gap engineering. Ternary Zn1−xCdxO allows reduction of the band gap relative to ZnO, which would be necessary for devices emitting visible light. We have analyzed the structural and optical properties of Zn1−xCdxO layers grown by metalorganic vapor-phase…
Well-defined silver chainlike and dendritic nanostructures with fractal features were self-organized via a simple solvothermal method using poly(vinyl pyrrolidone) (PVP) as an adsorption agent and architecture soft template. The branching fractal morphology was reasonably explained by using the Cayley tree model. Ther…
In situ Ga-doped ZnO nanotips were grown on amorphous fused silica substrates using metalorganic chemical vapor deposition. Structural, optical, and electrical properties of as-grown ZnO nanotips are investigated. Despite the amorphous nature of fused silica substrates, Ga-doped ZnO nanotips are found to be single cry…
The directed self-assembly of diblock copolymers offers unique routes for the design and fabrication of well-ordered arrays of nanoscopic structures. However, generating arrays with long-range order and few defects has been a difficult goal to achieve without extended thermal annealing processes. Here, a simple, one-s…
Electromagnetic radiation produced by avalanches in the magnetization reversal of Mn12-Acetate has been measured. Short bursts of radiation have been detected, with intensity significantly exceeding the intensity of the black-body radiation from the sample. The model based upon superradiance from inversely populated s…
We study numerically an atomistic model which is shown to exhibit a one--step crystal--to--amorphous transition upon decompression. The amorphous phase cannot be distinguished from the one obtained by quenching from the melt. For a perfectly crystalline starting sample, the transition occurs at a pressure at which a s…
We present a unifying theory for the observed complex structures of the sp-bonded elements under pressure based on nearly free electron picture (NFE). In the intermediate pressure regime the dominant contribution to crystal structure arises from Fermi-surface Brillouin zone (FSBZ) interactions - structures which allow…
We report on a systematic study of electronic transport in tetracene single crystals by means of space charge limited current spectroscopy and time of flight measurements. Both $I$-$V$ and time of flight measurements show that the room-temperature effective hole-mobility reaches values close to $μ\simeq 1$ cm$^2$/Vs a…
The Raman spectra of CaFe2O4 were measured with several exact scattering configurations between 20 and 520K and the symmetry of all observed Raman lines was determined. The Ag and B2g lines were assigned to definite phonon modes by comparison to the results of lattice dynamical calculations. No anomaly of phonon param…
We investigate the effect of external stresses on structural and mechanical properties of a strained damaged thin layer by developing a continuum phase-field mesoscale model based on the introduction of an order parameter field, the defect concentration, coupled with a displacement field. We find that even in the case…
The polarized Raman spectra from ab and ac surfaces of single crystal NaxCoO2 (x~0.7), parent compound of recently discovered superconductor NaxCoO2.yH2O, are reported and discussed. The crystals were hexagon platelets of typical size 3x3x0.1 mm. Three of the five (A1g+E1g+3E2g) Raman active phonons were unambiguously…
The far-from-equilibrium dynamics of two crystalline two-dimensional monolayers driven past each other is studied using Brownian dynamics simulations. While at very high and low driving rates the layers slide past one another retaining their crystalline order, for intermediate range of drives the system alternates irr…
The origin of the G-type antiferromagnetism [AFM(G)] and puzzling properties of $R\mathrm{T}\mathrm{i}{\mathrm{O}}_{\mathrm{3}}$ with $R=\mathrm{L}\mathrm{a}$ are studied. We clarify that the crystal field from La caused by the $\mathrm{G}\mathrm{d}\mathrm{F}\mathrm{e}{\mathrm{O}}_{\mathrm{3}}$-type distortion lifts t…
PURPOSE OF REVIEW: Nephrogenic fibrosing dermopathy (NFD) is a newly recognized scleroderma-like fibrosing skin condition. It develops in patients with renal insufficiency. This review summarizes recent case reports and examines theories of disease pathogenesis. Information from the Yale University NFD Registry Projec…
Poly(methylmethacrylate) and polystyrene–clay nanocomposites have been synthesized and exfoliated clay dispersion has been achieved (see Figure). Nanocomposite foams have been prepared using CO 2 as the foaming agent. Orders of magnitude increase in nucleation efficiency was accomplished by manipulation of clay disper…
Three types of CuO nanostructures—the nanorod, nanofiber, and nanoparticle—have been grown by using a self-catalytic growth process at 400, 500, and 600 °C, respectively. Field-emission (FE) properties of the CuO nanostructures were investigated. The results indicated that the FE current was significantly affected by…
Abstract Carbon nanotubes can be made soluble in both organic solvents and in aqueous solutions by organic functionalization. In particular, soluble carbon nanotubes can be further derivatized by coupling with amino acids and bioactive peptides. Immobilization of peptides to the external walls of carbon nanotubes may…
New NMR experiments are presented for the assignment of methyl (13)C and (1)H chemical shifts from Ile, Leu, and Val residues in high molecular weight proteins. The first class of pulse schemes transfers magnetization from the methyl group to the backbone amide spins for detection, while the second more sensitive clas…
3D PbS dendritic nanostructures (see Figure) have been fabricated by a facile hydrothermal method in the presence of N ‐cetyl‐ N , N , N ‐trimethyl‐ammonium bromide (CTAB). Both CTAB and thiourea play important roles in the formation of well‐defined PbS dendrites. X‐ray diffraction, electron diffraction, and high‐reso…
Synthesis of water‐soluble CdTe nanocrystals with high photoluminescence quantum yield and narrow fluorescence emission spectra (see Figure) is developed under the conditions of low precursor concentration and moderate temperature of hydrothermal growth. The relatively high temperature accelerates the particle growth…