Coupling between phonons and magnetic excitations in orthorhombic Eu_{1-x}Y_xMnO_3
In this work we present a detailed study of the structural and lattice dynamic properties of Y-doped EuMnO3 ceramics (Eu1-xYxMnO3, with 0
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Label-Free Highly Sensitive Detection of Proteins in Aqueous Solutions Using Surface-Enhanced Raman Scattering
We detected concentration-dependent surface-enhanced Raman scattering (SERS) spectra of several label-free proteins (lysozyme, ribonuclease B, avidin, catalase, and hemoglobin) for the first time in aqueous solutions. Acidified sulfate was used as an aggregation agent to induce high electromagnetic enhancement in SERS…
Density functional theory study of graphite oxide for different oxidation levels
Graphite oxide constitutes a hexagonal carbon network with oxygen atoms in carbon-oxide ether ring formations and hydroxyl molecules. We have studied graphite oxide with a first-principles density functional theory calculation for different oxidation levels. The oxygen atoms form 1,2-ether groups (epoxides) on the car…
Optical Nonlocalities and Additional Waves in Epsilon-Near-Zero Metamaterials
We analyze the optical properties of plasmonic nanorod metamaterials in the epsilon-near-zero regime and show, both theoretically and experimentally, that the performance of these composites is strongly affected by nonlocal response of the effective permittivity tensor. We provide the evidence of interference between…
Imaging of Photocurrent Generation and Collection in Single-Layer Graphene
Unlike in linear nanostructures, photocurrent generated in single-layer graphene (SLG) is expected to display two-dimensional characteristics. This allows the investigation of carrier dynamics, in relation to several spatially varying factors (such as the location of photocurrent generation and collection) and the ove…
Shape Control of Silver Nanoparticles by Stepwise Citrate Reduction
Growth of silver nanoparticles by the citrate reduction of silver nitrate under the range of pH from 5.7 to 11.1 was investigated systematically and quantitatively. Reduction of the silver precursor (Ag + ) was promoted with increased pH, attributed to the higher activity of the citrate reductant under high pH value.…
Impact of Phonon-Surface Roughness Scattering on Thermal Conductivity of Thin Si Nanowires
We present a novel approach for computing the surface roughness-limited thermal conductivity of silicon nanowires with diameter $D<100\text{ }\text{ }\mathrm{nm}$. A frequency-dependent phonon scattering rate is computed from perturbation theory and related to a description of the surface through the root-mean-squa…
Synthesis of N-Doped Graphene by Chemical Vapor Deposition and Its Electrical Properties
To realize graphene-based electronics, various types of graphene are required; thus, modulation of its electrical properties is of great importance. Theoretic studies show that intentional doping is a promising route for this goal, and the doped graphene might promise fascinating properties and widespread applications…
A comparison of FE beam and continuum elements for typical nitinol stent geometries
With interest in improved efficiency and a more complete description of the SMA material, this paper compares finite element (FE) simulations of typical stent geometries using two different constitutive models and two different element types. Typically, continuum elements are used for the simulation of stents, for exa…
Equilibrium vacancy concentrations inAl-Σ=33(554)[11¯0]by grand canonical Monte Carlo simulations
A Monte Carlo simulation of equilibrium thermal vacancies is extended to grain boundaries in Al. The vacancy localization is explored by intensive molecular-dynamics simulations. It is found that, in the symmetrical tilt boundary $\ensuremath{\Sigma}=33(554)[1\overline{1}0]$, the reference lattice, based on the coinci…
Chitosan blended bacterial cellulose as a smart material for biomedical application
Bacterial cellulose and chitosan blends have been successfully prepared by immersing wet bacterial cellulose pellicle in chitosan solution followed by freeze-drying. By changing chitosan concentration and immersion time, the chitosan content in the blends is ranged from 12% to 45%. The products look like a foam struct…
Evaluation of organic sub-monolayers by X-ray based measurements under gracing incident conditions
The structural investigations of model organic systems like pentacene on silicon oxide in the monolayer regime is very important for the basic understanding of initial nucleation process together with the electronic performance of transistor devices. A method for the evaluation of the island formation and layer closin…
Modelling of High-Speed Steels Fracture Toughness
The microstructure of AISI M2 high-speed steel can be substantially modified by a vacuum heat treatment, with the aim to improve the ratio of the hardness to the fracture toughness. This ratio is significantly affected by the volume fractions of undissolved eutectic carbides and retained austenite, as well as the mean…
Effects of uniaxial strain on the band structure of boron nitride nanotubes: a first principles study
First principles density functional calculations are used to study the uniaxial strain effects on the energy band structures of single- and multi-walled boron nitride nanotubes. Simulation results show that tensile strain induces a slight decrease in band gaps, while small and large compressive strains induce slight i…
Chemical states change at (Ba,Sr)TiO3/Pt interfaces investigated by x-ray photoelectron spectroscopy
X-ray photoelectron spectroscopy (XPS) is used to investigate the surface and the interface of the (Ba,Sr)TiO 3 /Pt structure. In the surface region, Ba 3d 5/2 , Ba 3d 3/2 Sr 3d 5/2 and Sr 3d 3/2 comprise two chemical states: the perovskite phase and the non-perovskite phase, whereas only a non-perovskite phase exists…
The intrinsic origin of the grain-boundary resistance in Sr-doped LaGaO3
In this paper I summarize our recent investigations (Park and Kim, Phys Chem C 111:14903, 2007; Solid State Ionics 179:1329, 2008) on the origin of the grain-boundary resistance in a doped LaGaO3, a perovskite-structured solid electrolyte. The partial electronic and ionic resistances of the bulk and the grain boundari…
Low-Temperature Observation of Photoinduced Electron Transfer from CdTe Nanocrystals
Photoinduced electron transfer from a CdTe nanocrystal (NC) to a photoluminescence quencher, 1,2,4,5-tetracyanobenzene (TCNB), has been studied with both steady-state photoluminescence spectroscopy and low-temperature time-resolved photoluminescence spectroscopy. The photoluminescence of CdTe NCs is quenched by TCNB m…
Preparation, Characterization, and Surface Modification of Carbon-Encapsulated Nickel Nanoparticles
Carbon-encapsulated nanonickel particles were prepared by heating nickel acetate highly dispersed in cured phenolic resin at 673 K in N 2 . The metallic nickel cores were about 50—80 nm in diameter, completely encapsulated with carbon shells about 10 nm thick. No byproduct, such as carbides, carbon rods, and carbon fi…
Properties of single crystal Fe1−xGax thin films
Molecular beam epitaxy was used to deposit single crystal thin film Fe1−xGax samples on ZnSe buffer layers grown on (001) and (110) single crystal GaAs substrates. The crystal quality of the GaAs surface and each deposited layer was monitored in situ by reflection high energy electron diffraction. The magnetic propert…
Effect of Zn doping on ultraviolet emission of ZnO crystals
ZnO single crystal wafers were treated in Zn-rich ambient at a high temperature. It is found that the UV intensity of the Zn-treated samples is dramatically enhanced both at low temperature (10 K) and at room temperature compared with the as-grown ZnO crystals. It is also observed that the peak energy in the visible r…