Materials Literature
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A spectroscopic ellipsometry compatible approach is reported for the optical study of Si quantum dots (QDs) in Si-rich nitride/silicon nitride (SRN/Si3N4) superlattice, which based on Tauc-Lorentz model and Bruggeman effective medium approximation. It is shown that the optical constants and dielectric functions of Si…
We show that a metamaterial slab with arbitrary values of $\ensuremath{\varepsilon}$ and $\ensuremath{\mu}$ behaves as a cloak at a finite frequency for a small object located sufficiently close to it due to the suppression of the object's optical excitations by enhanced reflections. Reflections due to propagating com…
Wet-chemical methods, under rigorous air-free conditions, were used to synthesize single-crystalline 10 nm diameter PbSe nanowires (NWs), and electric-field, directed assembly was employed to align NW arrays to form the semiconducting channels of field-effect transistors (FETs). Electrical measurements revealed as-ali…
We report magnetic susceptibility, resistivity, and heat capacity measurements on single crystals of the Sr(Fe${}_{1\ensuremath{-}x}$Co${}_{x}$)${}_{2}$As${}_{2}$ and Sr${}_{1\ensuremath{-}y}$Eu${}_{y}$(Fe${}_{0.88}$Co${}_{0.12}$)${}_{2}$As${}_{2}$ series. The optimal Co concentration for superconductivity in Sr(Fe${}…
OBJECTIVES: The aim of this study was to develop functionalized nanofibres as a simple delivery system for growth factors (GFs) and make nanofibre cell-seeded scaffold implants a one-step intervention. MATERIALS AND METHODS: We have functionalized polycaprolactone (PCL) nanofibres with thrombocytes adherent on them. I…
Hexagonal monodisperse NaCeF(4) and NaCeF(4):Tb(3+) nanorods have been successfully synthesized by a polyol-mediated solvothermal route with ethylene glycol (EG) as solvent. The crystalline phase, size, morphology, and luminescence properties were characterized using X-ray diffraction (XRD), scanning electron microsco…
This study presents an approach toward better understanding of the mechanical behavior of short discontinuous randomly oriented fiber-reinforced composites. Due to their expanded use, the combination of polypropylene (PP) matrix and glass fibers (GFs) was chosen as an example of an injection-molded short fiber system…
ZnO nanocrystals with different oxygen vacancy concentrations were characterized by high-resolution electron energy loss spectroscopy (HREELS). ZnO nanocrystals show a decrease in green emission with increasing annealing temperature in an oxygen environment and which significantly quenches in a sample annealed at 400…
Hydrogen has a significant impact on the structural and electronic properties of metals, insulators, and semiconductors. Despite the prevalence of hydrogen, little is known about its behavior in oxides such as strontium titanate (SrTiO3). In this work, hydrogen-related defects in SrTiO3 were investigated using infrare…
The nature of water interaction with tungsten nanorods (WNRs) fabricated by the glancing-angle deposition technique (GLAD)-using RF magnetron sputtering under various Ar pressures and substrate tilting angles and then subsequent coating with Teflon-has been studied and reported. Such nanostructured surfaces have shown…
Photoinduced electron transfer between an anionic porphyrin derivative (tetrakis(p-carboxyphenyl)porphyrin; H(2)TCPP(4-)) and an electron accepting methyl viologen (MV(2+)) was investigated in two different nanoscale configurations, i.e., layered titania nanosheet (TNS) photocatalysts and ammonium-functionalized monod…
The phonon dispersion and the vibrational density of states (VDOS) of graphene nanoribbons (GNR) of various widths and edge shapes are calculated using the force constant model including the fifth-nearest neighbor atoms. Among typical graphene peaks like E2g (or G) and D peaks, several distinctive ribbon peaks are ide…
Engineered nanoparticles (ENPs) are now being used in many sectors of industry; however, the impact of ENPs on the environment still requires further study, since their use, recycling, and accidental spill can result in the accumulation of nanoparticles in the atmosphere, soil, and water. Plants are an integral part o…
Nanowires have many technological applications as manipulators, force sensors and probes in nano-electromechanical systems. With the increasing ratio of surface area to bulk, surface effects play an important role in the mechanical response of nanowires. In this paper, we consider the influence of residual surface str…
High-pressure behaviors of bixbyite-type cubic In2O3 nanocrystals with an average grain size of 6.0 nm and bulk In2O3 samples were investigated by in situ high-pressure synchrotron radiation x-ray diffraction measurements up to 40 GPa at ambient temperature. It was found that nanosized and bulk samples began to transf…
Unsaturated fatty acids may be extracted from various agricultural resources and are widely used as soaps in the industry. However, there also exist a large variety of saturated and hydroxy fatty acids in nature, but their metal salts crystallize at room temperature in water, hampering their use in biological and chem…
With the help of first-principles GGA+U calculations, the origin of the deviation between the experimental and theoretical data for Cr2AlC was revealed. The structural, electrical and elastic properties of Cr2AlC were well described by considering the Cr 3d on-site Coulomb energy. The temperature effect on the bulk mo…
There has always been a fascination with "impossible" compounds, ones that do not break any rules of chemical bonding or valence but whose structures are unstable and do not exist. This instability can usually be rationalized in terms of chemical or physical restrictions associated with valence electron shells, multip…
4-Aminobenzenthiol (4-ABT) is an unusual molecule, showing variable surface-enhanced Raman scattering (SERS) spectra depending upon measurement conditions. In an effort to reduce ambiguity and add clarity, we have thus conducted an ultraviolet-visible (UV-vis) extinction measurement, along with Raman scattering measur…
A major obstacle in the realization of commercially viable single-walled carbon nanotube (SWNT) devices, hindering the functionality of this uniquely interesting type of material, is their type and site selective integration. Specifically, SWNT based piezoresistive pressure sensors require the incorporation of individ…