Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The effects of K and Co substitutions and quasihydrostatic applied pressure ($P<9$ GPa) in the local atomic structure of BaFe${}_{2}$As${}_{2}$, Ba(Fe${}_{0.937}$Co${}_{0.063}$)${}_{2}$As${}_{2}$ and Ba${}_{0.85}$K${}_{0.15}$Fe${}_{2}$As${}_{2}$ superconductors were investigated by extended x-ray absorption fine st…
Pairs of nanoparticles separated by a controllable gap size that can be as small as 3 nm are fabricated via a top-down lithographic procedure. This fabrication method would be useful not only for surface-enhanced Raman scattering, where it could potentially enable single-molecule sensitivity, but also for other applic…
This Concept article provides an elementary discussion of a special class of large-sized gold compounds, so-called Au nanoclusters, which lies in between traditional organogold compounds (e.g., few-atom complexes, <1 nm) and face-centered cubic (fcc) crystalline Au nanoparticles (typically >2 nm). The discussion is fo…
We propose a new method to calculate polarization induced interfacial charges in semiconductor heterostructures using classical electrostatics applied to real-space band diagrams from first principles calculations and apply it to GaN/AlN heterostructures with ultrathin AlN layers (4-6 monolayers). We show that the cal…
An efficient approach for the simulation of ion scattering from solids is proposed. For every encountered atom, we take multiple samples of its thermal displacements among those which result in scattering with high probability to finally reach the detector. As a result, the detector is illuminated by intensive "shower…
Organic electronics is a rapidly developing technology. Typically, the molecules involved in organic electronics are made up of hundreds of atoms, prohibiting a theoretical description by wavefunction-based ab-initio methods. Density-functional and Green's function type of methods scale less steeply with the number of…
The Young modulus of individual single-walled boron nitride nanotubes (SW-BNNTs) was determined using a high-resolution transmission-electron microscope (HRTEM)-atomic force microscope (AFM) set-up. The Young modulus and maximum stress for these NTs were deduced from the analysis of the stress-strain curves, and discu…
The polar interface between LaAlO${}_{3}$ and SrTiO${}_{3}$ has shown promise as a field effect transistor, with reduced (nanoscale) feature sizes and potentially added functionality over conventional semiconductor systems. However, the mobility of the interfacial two-dimensional electron gas (2DEG) is lower than desi…
Abstract The coexistence of electrical polarization and magnetization in multiferroic materials provides great opportunities for novel information storage systems. In particular, magnetoelectric (ME) effect can be realized in multiferroic composites consisting of both ferromagnetic and ferroelectric phases through a…
Head-to-head and tail-to-tail ${180}^{\ifmmode^\circ\else\textdegree\fi{}}$ domain walls in a finite isolated ferroelectric sample are theoretically studied using Landau theory. The full set of equations, suitable for numerical calculations, is developed. The explicit expressions for the polarization profile across th…
Manganese in large numbers: The largest number of manganese ions ever incorporated in a polyoxometalate (POM) is found in a planar Mn19-oxo-hydroxo magnetic cluster incorporated in a discrete 60-tungsto-6-silicate (see structure Mn yellow, O red/pink). The compound has interesting structural, magnetic, and electrochem…
Treatment of a meso-arylboron dipyrrin (BODIPY) with NBS provides mono- and dibrominated BODIPYs at the 2- and 6-positions in excellent yields with high regioselectivity. Brominated products can be employed as a nice building block for the synthesis of a variety of BODIPY derivatives through Suzuki-Miyaura coupling. B…
Graphene is a novel two-dimensional nanomaterial that holds great potential in electronic and sensor applications. By etching the edges to form nanoribbons or introducing defects on the basal plane, it has been demonstrated that the physical and chemical properties of graphene can be drastically altered. However, the…
A facile way to segregate wafer-size graphene with controllable layer number using Cu–Ni binary alloy under vacuum annealing condition is presented here. Increasing atomic percentage of Ni in Cu–Ni alloy was found to segregate thicker uniform graphene. To date, over 95% monolayer and 91% bilayer graphene films have be…
It is shown how, in multiband materials, the Hund's coupling plays a crucial role in tuning the degree of electronic correlation. While in half-filled systems it enhances the correlations, in all other cases it pushes the boundary for the Mott transition at very high critical couplings. Moreover in weakly hybridized n…
Of good report: Synthesis and screening of an 80-member tricarbocyanine library identified CyNAMLA-381 as a near-IR surface-enhanced Raman spectroscopy (SERS) reporter with good signal stability and higher sensitivity than the standard. Encapsulation of CyNAMLA-381 on gold nanoparticles and conjugation to an antibody…
Acid-decomposable, luminescent ZnO quantum dots (QDs) have been employed to seal the nanopores of mesoporous silica nanoparticles (MSNs) in order to inhibit premature drug (doxorubicin) release. After internalization into HeLa cells, the ZnO QD lids are rapidly dissolved in the acidic intracellular compartments, and a…
This paper presents a method that measures an impact process of a spherical object colliding with on a testing material and, through analytical techniques based on Hertz's theory of impact, deduces the elastic modulus of the tested material. Furthermore, by distinguishing the compress and rebound phrases, and by accou…
This paper presents a rapid geomaterial strength testing method that measures the impact process of a spherical object colliding with a test material. This method is based on Vesic (1977) cavity expansion theory and combines with the technology developed for measuring deformation characteristics (in a companion paper…
A framework for calculating the $k$-conserving component of K edge resonant x-ray emission spectroscopy measurements of anisotropic solids is presented. The crystalline band structure is calculated using a quasiparticle self-consistent GW implementation. Coherent spectra are calculated in the Kramers-Heisenberg formal…