Atomically Engineered Oxide Interfaces
New solid-state phenomena emerge when interfaces between different oxides are created with atomic-scale precision.
Materials Literature
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Longitudinal Optical Phonons in Metallic and Semiconducting Carbon Nanotubes
We analyze the high-energy Raman modes, G+ and G-, in a pair of one metallic and one semiconducting nanotubes. By combining Rayleigh scattering with Raman resonance profiles of the radial breathing mode and the high-energy modes, we show that the observed G- and G+ peaks can originate from longitudinal optical phonons…
High‐strength composites based on tung oil polyurethane and wood flour: Effect of the filler concentration on the mechanical properties
Abstract New composite materials with a high percentage of their composition based on renewable resources, matrix and reinforcement, were prepared. The excellent compatibility of the main phases lead to an unusual outstanding composite behavior as follows: higher modulus and strength, but also higher deformability and…
Unusual Electronic Features and Reactivity of the Dipyridylazaallyl Ligand: Characterizations of (smif) 2 M [M = Fe, Co, Co + , Ni; smif = {(2-py)CH} 2 N] and [(TMS) 2 NFe] 2 (smif) 2
Application of the dipyridylazaallyl ligand (2-py)CHNCH(2-py) (smif) to a series of first-row transition metals afforded (smif)(2)M(n) [n = 0, M = Fe (1), Co (2), Ni (3); n = +1, M = Co (2+)] and {(TMS)(2)NFe}(2)(smif)(2) (4(2)) via metathetical procedures. The Mossbauer spectrum of 1 (S = 0) and TDDFT calculations, i…
Is Silicon's Reign Nearing Its End?
Band-gap engineering and optoelectronic properties of 2D WSi2N4 nanosheets: A first principle calculations,
Reversible Luminescent Switching in a [Eu(SiW10MoO39)2]13−‐Agarose Composite Film by Photosensitive Intramolecular Energy Transfer
Transparent, flexible, self-supporting EuSiWMo/agarose composite films are fabricated by a combination of hydrogel chemistry and a casting technique, and present reversible, high-contrast luminescence photoswitching modulated by inorganic photochromic components through intramolecular resonance-energy transfer. Two-di…
Unveiling the Formation Mechanism of Pseudo-Single-Crystal Aragonite Platelets in Nacre
We demonstrate direct evidence that a single-crystal-like aragonite platelet is essentially assembled with aragonite nanoparticles. The aragonite nanoparticles are readily oriented and assembled into pseudo-single-crystal aragonite platelets via screw dislocation and amorphous aggregation, which are two dominant media…
Fabrication of Continuous and Segmented Polymer/Metal Oxide Nanowires Using Cylindrical Micelles and Block Comicelles as Templates
Cylindrical micelles were added as templates to sol–gel reaction mixtures to yield highly elongated polymer/inorganic nanostructures with smooth nanothin surface coatings of silica, zirconia, or alumina. Differences in the templating activity of neutral or cationic coronas can be exploited by using triblock comicelles…
Electrical properties of vanadium oxide thin films for bolometer applications: processed by pulse dc sputtering
Vanadium oxide (VO x ) thin films were deposited on thermally grown silicon oxide substrates using a pure vanadium target in a pulsed dc sputtering technique. Film microstructure, electrical resistivity, temperature coefficient of resistance (TCR) and activation energy were studied as a function of the oxygen partial…
Double Emulsion Templated Microcapsules with Single Hollow Cavities and Thickness-Controllable Shells
A novel form of microcapsules, which possess single hollow cavities and thickness-controllable shells, were prepared by a two-step emulsification, emulsion ripening, and suspension polymerization. Parameters on morphology control of water-in-oil-in-water (W/O/W) emulsion globules were particularly investigated in this…
Water-driven structural evolution of the polar MgO (111) surface: An integrated experimental and theoretical approach
We report an experimental and theoretical analysis of the $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}\text{\ensuremath{-}}R30\ifmmode^\circ\else\textdegree\fi{}$ and $2\ifmmode\times\else\texttimes\fi{}2$ reconstructions on the MgO (111) surface combining transmission electron microscopy, x-ray photoelectron s…
Formation of Large Voids in the Amorphous Phase-Change MemoryGe2Sb2Te5Alloy
On the basis of ab initio molecular dynamics simulations, large voids mainly surrounded by Te atoms are observed in molten and amorphous Ge2Sb2Te5, which is due to the clustering of two- and threefold coordinated Te atoms. Furthermore, pressure shows a significant effect on the clustering of the under coordinated Te a…
Optimal control of the local electromagnetic response of nanostructured materials: optimal detectors and quantum disguises
We consider the problem of optimization of an effective trapping potential in a nanostructure with a quasi-one-dimensional geometry. The optimization is performed to achieve certain target optical properties of the system. We formulate and solve the optimization problem for a nanostructure that serves either as a sing…
Optically induced electrostriction modes in a nanoparticle of a uniformly charged electret
The electromagnetic response of a nanoparticle of an ion-doped polymeric elastic insulator, commonly called as an electret, is considered in the continuum model of a uniformly charged elastic sphere. The spectral formulae for the frequency of optically induced spheroidal and torsional shear oscillations driven by bulk…
Effect of interfacial species mixing on phonon transport in semiconductor superlattices
Molecular dynamics simulations are used to examine the effect of interfacial species mixing on the thermal conductivity of Stillinger-Weber $\text{Si}/{\text{Si}}_{0.7}{\text{Ge}}_{0.3}$ and Si/Ge superlattices at a temperature of 500 K. The thermal conductivity of $\text{Si}/{\text{Si}}_{0.7}{\text{Ge}}_{0.3}$ superl…
Simple and Generalized Synthesis of Semiconducting Metal Sulfide Nanocrystals
Abstract Uniform‐sized semiconducting nanocrystals of binary metal sulfides are synthesized from the thermolysis of metal‐oleate complexes in alkanethiol. The size of the Cu 2 S nanocrystals can be tuned from 7 to 20 nm by varying the reaction conditions. Various shaped nanocrystals of CdS, ZnS, MnS, and PbS are synth…
Spin-selective localization due to intrinsic spin-orbit coupling
We study spin-dependent diffusive transport in the presence of a tunable spin-orbit (SO) interaction in a two-dimensional electron system. The spin precession of an electron in the SO coupling field is expressed in terms of a covariant curvature, affecting the quantum interference between different electronic trajecto…
Probing charged impurities in suspended graphene using Raman spectroscopy
Charged impurity (CI) scattering is one of the dominant factors that affect the carrier mobility in graphene. In this paper, we use Raman spectroscopy to probe the charged impurities in suspended graphene. We find that the 2D band intensity is very sensitive to the CI concentration in graphene, while the G band intens…
Spin-orbit induced non-collinear spin structure in deposited transition metal clusters
The influence of the spin-orbit coupling on the magnetic structure of deposited transition metal nanostructure systems has been studied by fully relativistic electronic structure calculations. The interplay of exchange coupling and magnetic anisotropy was monitored by studying the corresponding magnetic torque calcula…
Metal Chalcogenide Clusters on the Border between Molecules and Materials
Abstract The preparative and materials chemistry of high nuclearity transition metal chalcogenide nanoclusters has been in the focus of our research for many years. These polynuclear metal compounds possess rich photophysical properties and can be understood as intermediates between mononuclear complexes and binary bu…