Materials Literature
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We have studied $\mathrm{Zn}{(\mathrm{C}\mathrm{N})}_{2}$ at high pressure using Raman spectroscopy and report Gr\"uneisen parameters of the soft phonons. The phonon frequencies and eigenvectors obtained from ab initio calculations are used for the assignment of the observed phonon spectra. Out of the 11 zone-center o…
A simple multiferroic composite with a single period of 1-3-type structure, consisting of one Pb(Zr,Ti)O3 (PZT) rod embedded in a Terfenol-D/epoxy mixture, is reported. The coupling interaction between this PZT rod and the surrounding mixture produces a giant magnetoelectric response (see figure) of ca. 500 mV cm–1 Oe…
We examine the contact angle of water droplets on polystyrene (PS) thin films of varying thicknesses supported by silicon wafers under both air and pressurized carbon dioxide (CO2) environments. At 23 degrees C, the contact angle is found to increase upon increasing CO2 pressure in the vapor regime and then levels off…
Abstract Mesostructured silica thin films and particles prepared by surfactant‐templated sol–gel techniques are highly versatile substrates for the formation of functional materials. The ability to deliberately place molecules possessing desired activities in specific spatially separated regions of the nanostructure i…
We carried out micro-Raman spectroscopy of graphene layers over the temperature range from approximately 80 K to 370 K. The number of layers was independently confirmed by the quantum Hall measurements and atomic force microscopy. The measured values of the temperature coefficients for the G and 2D-band frequencies of…
Nanoindentation-induced phase transformation in silicon has been studied. A series of nanoindentations were made with the sharp diamond Berkovich tip. During nanoindentations, maximum load ranged from 2000 $μ$N to 5000 $μ$N, with a 1000 $μ$N/sec loading rate. Slow unloading rate at 100$μ$N/sec was chosen to favor the…
We have prepared light emitting nanocrystalline porous silicon (PS) layers by electrochemical anodization of crystalline silicon (c-Si) wafer and characterized the c-Si/PS heterojunctions using temperature dependence of dark current-voltage (I-V) characteristics. The reverse bias I-V characteristics of c-Si/PS heteroj…
We present a Tight-Binding Molecular Dynamics investigation of the stability, the geometrical and the electronic structure of suspended monatomic transition metal chains. We show that linear and stable monatomic chains are formed at temperature equal or smaller than 500 K for Au, 200 K for Ag and 4 K for Cu. We also e…
The material and electrical properties of the CNT single vias and array vias grown by microwave plasma-enhanced chemical vapor deposition were investigated. The diameters of multiwall carbon nanotubes (MWNTs) grown on the bottom electrode of Ta decrease with increasing pretreatment power and substrate temperature whil…
Single-crystalline, narrow-size- distribution ultrafine ZnS nanobelts (see figure), revealing a notable quantum-confinement effect, have been synthesized at a high yield by controlling the evaporation and agglomeration rates. Field-emission measurements show ultrafine ZnS nanobelts are very good field emitters with a…
Atomistic simulations were employed to investigate the structure and energy of asymmetric tilt grain boundaries in Cu and Al. In this work, we examine the Σ5 and Σ13 systems with a boundary plane rotated about the ⟨ 100 ⟩ misorientation axis, and the Σ9 and Σ11 systems rotated about the ⟨ 110 ⟩ misorientation axis. As…
An effective computational scheme to calculate the complete set of independent elastic constants as well as other structural parameters including bulk modulus, shear modulus, Young's modulus, and Poisson's ratio for crystals is reported. The scheme is based on the stress–strain analysis approach with the appropriate s…
A hierarchically-structured ZnO film consisting of secondary colloidal spheres of ~ 300 nm in diameter and primary nanoparticles of ~ 20 nm in diameter is shown to have an ~ 83% improvement in the overall light conversion efficiency, when compared to commercially-obtained ZnO film with ~ 25 nm particles. This increase…
Optical properties of Sn-doped In(2)O(3) (ITO) have been studied in the optical range of 0.4-12 microm. A deposition has been made on BK7 glass, magnesium fluoride, sapphire, and zinc sulfide substrates. The layers have been characterized by their optical properties, DC electrical sheet resistivity, and Hall mobility.…
With the aim of combining the electron and hole-transporting moieties into one molecule and to continue our investigation into the structure–property correlations of dendrimers, two novel star-burst dendrimers 1 and 2 constructed with carbazoles as the peripheral hole-transporting moieties and one triazine moiety as a…
Abstract A trinuclear Mn II complex was obtained by reaction of manganese(II) perchlorate with the ligand 2‐methoxy‐6‐(pyridine‐2‐ylhydrazonomethyl)phenol in methanol. The X‐ray crystal structure of [Mn 3 L 4 ](ClO 4 ) 2 (H 2 O) 2 ( 1 ) reveals that the “bent” chain of the Mn II ions is assembled by a unique click‐ass…
A simple and well-ordered fabrication procedure for polymeric thin films with nanopores and nanogrooves is described. By utilizing the neutral surface of self-assembled monolayers (SAMs) of commercially available 3-( p -methoxyphenyl)propyltrichlorosilane (MPTS), the cylindrical microdomains of PMMA of the asymmetric…
The effects of the dielectric constant of the glass substrates on liquid crystal lens performances are studied. Lens properties and the optimum geometrical structure almost does not change with the dielectric constant. The driving voltages become low when glass substrates of high dielectric constant are used.
The effect of replacing Mn for Fe in the ferrimagnetic perovskite CaCu 3 Mn 4 O 12 has been studied in the series of nominal composition CaCu 3 (Mn 4− x Fe x )O 12 ( x = 0, 0.5, 1.0). These materials have been prepared in polycrystalline form under moderate pressure conditions of 2 GPa, in the presence of KClO 4 as ox…
The title compound contains layers built up from isolated BO3 triangles and MgO6 octahedra, interleaved with SrO9 polyhedra to form a three-dimensional framework. The Sr atom is nine-coordinate in a distorted tricapped trigonal prismatic geometry. Sr, B and one O atom have m point symmetry and Mg 2/m point symmetry.