Materials Literature
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We study the dependence of the electronic structure of iron pnictides on the angle formed by the arsenic–iron bonds. Within a Slater–Koster tight binding model which captures the correct symmetry properties of the bands, we show that the density of states and the band structure are sensitive to the distortion of the t…
In the nonstoichiometric low-temperature phase of silver selenide a very small silver excess within the semiconducting silver selenide matrix in the order of 0.01% is sufficient to generate a linear magnetoresistance (LMR) of more than 300% at 5 T, which does not saturate at fields up to 60 T. Different theoretical mo…
We present a study of the effects of nanoconfinement on a system of hard Gaussian overlap particles interacting with planar substrates through the hard-needle-wall potential, extending earlier work by two of us [D. J. Cleaver and P. I. C. Teixeira, Chem. Phys. Lett. 338, 1 (2001)]. Here, we consider the case of hybrid…
We report on fabrication and electrical characteristics of field effect transistors (FETs) based on ZnO/Mg0.2Zn0.8O coaxial nanorod heterostructures. As compared to bare ZnO nanorod FETs, coaxial nanorod heterostructure FETs exhibited the enhanced mobility (∼110 cm2/V s), superior subthreshold swing (∼200 mV/decade),…
We investigated the inner structure of an aggregate made of single-wall carbon nanohorns (SWNHs). This structure has not been clarified because the thousands of SWNHs are densely packed and difficult to observe directly by electron microscopy. We used Gd 2 O 3 as a probe for the electron microscope observation: Gd 2 O…
The experimental data obtained with Raman, x-ray photoelectron, and continuous-wave and time-resolved photoluminescence spectroscopies on silicon-rich silicon oxide samples with different O/Si ratios and annealing temperatures are analyzed. It is shown that Si grains, with atoms bound as in bulk Si, are not the direct…
The growth mechanism of In-doped ZnO (ZnO:In) nanorods grown on AuGe/Si(111) substrates has been investigated. Unlike to general vapor-liquid-solid mechanism, the adatom kinetics on the surface determines the length-diameter relationship [L(D)], initial nuclei size (D∗), and spatial distribution of impurity atoms. The…
We report the observation of superconductivity in ${\text{La}}_{3}{\text{Ni}}_{4}{\text{P}}_{4}{\text{O}}_{2}$ at 2.2 K. The layer stacking in this compound results in an asymmetric distribution of charge reservoir layers around the ${\text{Ni}}_{2}{\text{P}}_{2}$ planes. The estimated Wilson ratio, ${R}_{W}\ensuremat…
We report in this letter the fabrication of unique single-crystalline silver filaments with periodic, pearl-chain-like structures by electrodeposition without using any templates, surfactants, and additives. Fourier transform infrared spectroscopy, infrared focus-plane-array imaging, and numerical simulations demonstr…
The authors have employed variable temperature photoluminescence (PL) and time-resolved PL spectroscopy to probe the exciton recombination in high density and vertically aligned ZnO nanorods grown on p-type GaN/sapphire template. The low-temperature PL characterizes the dominant near-band-edge excitonic emissions from…
An experimental study--involving measurements with an optical microscope, a profilometer, and a scanning electron microscope--for determination of the surface profile of x-ray tube anodes is presented. The islands on the "mud-flatting" surface are separated by approximately 8 microm deep cracks. The surface roughness…
Zinc oxide (ZnO) nanocrystals (NCs) with high crystalline quality were prepared via radio-frequency magnetron sputtering as a SiO(2)/ZnO/SiO(2) trilayer on Si(100) and Al(2)O(3)(0001) substrates with an intermediate in situ annealing step. Transmission electron microscopy reveals a uniform dispersion of ZnO NCs in the…
Using first-principles molecular dynamics simulations, the displacement threshold energy and defect configurations are determined in SiC nanotubes. The simulation results reveal that a rich variety of defect structures (vacancies, Stone-Wales defects and antisite defects) are formed with threshold energies from 11 to…
The interaction of the surface plasmons of gold nanoparticles (NP) a few nanometers in size with fluorophores can be used to engineer their fluorescence properties. This possibility can be exploited in principle to obtain nanodevices for protein−protein recognition. We studied different types of constructs based on go…
In this work we report on the detection and vacuum-ultraviolet (VUV) photoionization of gas-phase SiO(2) generated in situ via laser ablation of silicon in a CO(2) molecular beam. The resulting species are investigated by single-photon ionization with tunable VUV synchrotron radiation and mass analyzed using reflectro…
The hole-trapped antisite bismuth center has been directly observed by $W$-band (94 GHz) electron paramagnetic resonance (EPR) in the series of sillenite crystals, ${\text{Bi}}_{12}M{\text{O}}_{20}$ ($M=\text{Ge},\text{Si},\text{Ti}$, denoted as BMO), either nondoped or doped with transition ions (Cr, Cu, Ru, Ce). Blu…
Doped with a red-emitting oligofluorene, fluid and glassy cholesteric liquid crystal (CLC) films are characterized by similar lasing thresholds and efficiencies. With picosecond excitations the output from a glassy CLC laser is temporally stable, but that from a fluid CLC laser decays with time. The difference in stab…
In this paper we report the synthesis, the photophysical, conductometric, and second-order nonlinear optical (NLO) characterization of an ensamble of four NLO active organic tails nanoorganized on a cyclotetrasiloxane ring, to produce various macrocyclic NLO chromophores. The second-order NLO response of the macrocycl…
Abstract The use of amperometric biosensor for the detection of glyphosate herbicide and its metabolite aminomethylphosphonic acid (AMPA) is presented. The biosensor was developed by electrochemically depositing poly(2,5‐dimethoxyaniline) (PDMA) doped with poly(4‐styrenesulfonic acid) (PSS) onto the surface of a gold…
Thiosulfate-intercalated zinc-aluminum LDH was prepared by anion exchange reaction. The interlayer thiosulfate ions of this LDH could be quantitatively oxidized to tetrathionate ions using iodine and sulfate ions using H2O2. Both of these intracrystalline reactions are topotactic in nature. The reaction of the LDH wit…