Materials Literature
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The optical dielectric function of cerium oxide (CeO 2 ) was characterized by the spectroscopic ellipsometry (SE) technique using the Kramers–Kronig relation and the Tauc–Lorentz (TL) dispersion model. Experimental results showed that the bandgap energy and refractive index at 632.8 nm of CeO 2 are about 3.23 ± 0.05 e…
This work reports on ab initio calculations and experiments on the half-metallic ferromagnetic Heusler compounds ${\text{Co}}_{2}\text{Ti}Z$ $(Z=\text{Si},\text{ }\text{Ge},\text{ }\text{Sn})$. Aim is a comprehensive study of the electronic-structure and thermoelectric properties. The impact of the variation in the ma…
We fabricated an acoustic composite structure consisting of a periodic array of interspaced membranes and side holes. Experimental data on the transmission, effective density, and phase velocity are presented. The system exhibits two critical frequencies, ${\ensuremath{\omega}}_{\mathrm{SH}}$ and ${\ensuremath{\omega}…
The understanding of shape control of colloidal nanoparticles is still rather limited even after well over a decade of intensive research efforts. While surface capping agents can greatly influence the growth habit of nanocrystals in solution, the formation of certain morphology can hardly be understood based on both…
The magnetic properties of ${\text{Zn}}_{1\ensuremath{-}x}{\text{Co}}_{x}\text{O}$ ($x=0.07$ and 0.10) thin films, which were homoepitaxially grown on a ZnO(0001) substrates with varying relatively high oxygen pressure, have been investigated using x-ray magnetic circular dichroism (XMCD) at $\text{Co}\text{ }2p$ core…
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We delineate a general theoretical framework to determine the substrate-regulated graphene morphology through energy minimization. We then apply such a framework to study the graphene morphology on a substrate with periodic surface grooves. Depending on the substrate surface roughness and the graphene–substrate interf…
We investigate the electronic and magnetic properties of hydrogenated carbon nanotubes using ab initio spin-polarized calculations within both the local density approximation (LDA) and the generalized gradient approximation (GGA). We find that the combination of charge transfer and carbon network distortion makes the…
We have carried out first principles all-electron calculations of the (001)-projected 2D electron momentum density and the directional Compton profiles along the [100], [001] and [110] directions in the Fe-based superconductor LaOFeAs within the framework of the local density approximation. We identify Fermi surface f…
Manganese-doped zinc selenide quantum dots (Mn:ZnSe d-dots) with high optical quality, pure dopant emission with 40−60% photoluminescence quantum yield, were synthesized with air-stable and generic starting materials, namely zinc (manganese) fatty acid salts with corresponding free fatty acids, Se powder, fatty amine,…
Using the fluctuation-exchange approximation, we study an effective five-band Hubbard model for iron-pnictide superconductors obtained from the first-principles band structure. We preclude deformations of the Fermi surface due to electronic correlations by introducing a static potential, which mimics the effect of cha…
Peaceful coexistence: Metal–organic frameworks (MOFs) offer new openings in the stabilization of multiferroic materials. A series of compounds with a hydrogen-bond-triggered order–disorder transition combines both electric and magnetic order. These compounds constitute a new approach that significantly differs from ot…
Au nanoparticles grown on D- and L-isomers of diphenylalanine peptide nanotubes showed a bisignated CD signal at their surface plasmon frequency with positive and negative couplets, respectively. The surface plasmon coupled CD signal in these hybrid systems originates from the asymmetric organization of Au nanoparticl…
The effects of high pressures on the structure of silica glass have been elucidated using high-energy x-ray diffraction up to 43.5 GPa. A decrease in the first two peak positions in the real-space pair-distribution functions up to 15 GPa indicates an initial shrinkage of the tetrahedral units. Above this threshold pre…
Using the de Haas-van Alphen effect we have measured the evolution of the Fermi surface of BaFe2(As1-xPx){2} as a function of isoelectric substitution (As/P) for 0.41<x<1 (T{c} up to 25 K). We find that the volumes of electron and hole Fermi surfaces shrink linearly with decreasing x. This shrinking is accompanied by…
In a nutshell: A nanosized core/shell cluster has been synthesized by reaction of AgCCtBu with AgOTf in the presence of a polyoxometalate (POM) template under solvothermal conditions. The peanutlike structure (see picture) consists of two Mo6O228− nuts (green) and an Ag60 shell (purple). Electrochemical studies revea…
High-resolution x-ray diffraction measurements reveal an unusually strong response of the lattice to superconductivity in Ba(Fe1-xCox)2As2. The orthorhombic distortion of the lattice is suppressed and, for Co doping near x=0.063, the orthorhombic structure evolves smoothly back to a tetragonal structure. We propose th…
The high carrier mobility of graphene has been exploited in field-effect transistors that operate at high frequencies. Transistors were fabricated on epitaxial graphene synthesized on the silicon face of a silicon carbide wafer, achieving a cutoff frequency of 100 gigahertz for a gate length of 240 nanometers. The hig…
Core-shell nanoparticles with an upconverting phosphorescent, lanthanide core and plasmonic gold shell are employed for Förster Resonance Energy Transfer (FRET). FRET is demonstrated from a highly efficient upconverting fluoride nanoparticle doped with Ytterbium (Yb) and Erbium (Er) ions to Streptavidin conjugated wit…
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