Materials Literature
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A numerical approach has been developed to study the spatial resolution of piezoresponse force microscopy (PFM) in resolving ferroelectric nanostructures, capable of analyzing complicated domain patterns with arbitrary three-dimensional heterogeneity. It is found that the spatial resolution of PFM is limited by long r…
It has been possible to incorporate cadmium ions in ZnS quantum dots (QDs). It is studied how the substitution of Cd2+ ions by zinc ions affects the structural, morphological, and optical properties of ZnS QDs. Zn1−xCd x S QDs are prepared by a simple beaker chemistry approach and characterized by X-ray diffraction (X…
Piezoelectric materials have wide band gap and no inversion symmetry. Only the orthorhombic phase of lead metaniobate (PbNb 2 O 6 ) can be ferroelectric and piezoelectric below Curie temperature, but not the rhombohedral phase. High temperature piezoelectric applications in current decades have revived international i…
We have studied the vortex dynamics in the PrFeAsO0.60F0.12 superconducting sample by dc magnetization and dynamic magnetization-relaxation rate (Q) measurements. The field dependence of the superconducting irreversible magnetization Ms reveals a second magnetization peak or fishtail effect. The large value of Q is an…
Methanol is the future and clean fuel, and its chemistry on metal surfaces has received much attention. In this paper we explore methanol dissociation on the clean and O or OH covered PdZn(111) that mimics Pd∕ZnO catalyst studied as a promising catalyst for methanol steam reforming, using density functional theory at…
Bi2Fe4O9 with an orthorhombic structure and lattice parameters a = 7.9595 Å, b = 8.4297 Å, c = 5.9912 Å, and V = 401.987 Å3 has been prepared by solid-state reactions method. Its molar magnetic susceptibility measured as a function of temperature in the range 5–950 K indicates that Bi2Fe4O9 is an antiferromagnet with…
We study phonon modes in two-dimensional colloidal crystals composed of soft microgel particles with hard polystyrene particle dopants distributed randomly on the triangular lattice. This experimental approach produces close-packed lattices of spheres with random bond strength disorder, i.e., the effective springs cou…
The surface of BiFeO3 single crystals has been characterized at the local level using several AFM-based techniques. We have observed the presence of two different epilayers showing electrical and mechanical properties different from those of the bulk: a ferroelectrically “dead” outer skin of 5 nm sitting upon a subsur…
The London penetration depth was measured in optimally doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_{2}$As${}_{2}$ crystals, with and without columnar defects produced by 1.4 GeV ${}^{208}$Pb irradiation. The low temperature behavior of unirradiated samples was consistent with a fully gapped superconducting state with a minimum…
The single-molecule surface-enhanced Raman scattering (smSERS) has been extensively studied after the initial observation in 1997, yet there still exist unsettled issues in the fundamental mechanism of smSERS. In this review, we survey some of the recent breakthroughs in the mechanism of smSERS and its application.
We report on our joint spectroscopic study of the thermal reduction process of quasi-monolayer graphene oxide films grown on fused silica substrates by spin-coating. We estimate that about 65% of our film area consists of monolayer platelets of reduced graphene oxide, based on our quantitative analysis of the local at…
ABSTRACT For many years researchers have understood the importance of the extracellular pH in solid tumors in relation to cancer morbidity and mortality. However current diagnostic imaging techniques do not allow for the non‐invasive determination of pH in vivo . Recent research in the use of pH‐responsive organic pol…
INTRODUCTION: X-ray crystallography is the main tool for macromolecular structure solution at atomic resolution. It provides key information for the understanding of protein function, opening opportunities for the modulation of enzymatic mechanisms, and protein-ligand interactions. As a consequence, macromolecular cry…
A low density vertically aligned carbon nanotube-based field-emission cathode with a ballast resistor and coaxial gate is designed and fabricated. The ballast resistor can overcome the non-uniformity of the local field-enhancement factor at the emitter apex. The self-aligned fabrication process of the coaxial gate can…
Abstract Steady‐state and time‐resolved photoluminescence of silicon nanoparticles dispersed in low‐polar liquids at above room temperature is studied. The roles of low‐polar liquids as well as mechanisms responsible for their temperature‐dependent photoluminescence are discussed. The thermal sensitivity of the photol…
Polyvinyl alcohol (PVA) doped (Se80Te20)100–xAgx (0 ≤ x ≤ 4) thin films were prepared by the spin-coating technique on a quartz substrate. The optical parameters of PVA-doped (Se80Te20)100–xAgx (0 ≤ x ≤ 4) composites at the same chalcogen concentration (S0 = 0.1 mg ml−1) and PVA/(Se80Te20)96Ag4 composites at three dif…
ABSTRACT An efficient procedure for the copolymerization of ethylene (E) with a novel norbornenic comonomer (N ArOH ) bearing a stabilizing moiety analogous to commercial antioxidant 2,6‐di‐ tert ‐butyl‐4‐methylphenol (BHT) is successfully developed. This study is aimed at: i) tuning the concentration of the stabilizi…
PZT 95/5 ferroelectric ceramics have been used in shock-driven pulsed-power supplies for many years; their mechanical failure under shock compression plays an important role in dielectric breakdown. Shock experiments have been conducted to understand such failure by measuring the velocity of the free surface or the PZ…
Guest-induced cocrystallization of amorphous poly(2,6-dimethyl-1,4-phenylene ether) (PPO) films has been investigated, mainly by X-ray diffraction and FTIR spectroscopy. Two different kinds of uniplanar orientations have been found for PPO cocrystalline phases with α-pinene, which present their (110) and (200) crystal…
c-axis oriented ferroelectric bismuth titanate (Bi4Ti3O12) thin films were grown on (001) strontium titanate (SrTiO3) substrates by an atomic vapor deposition technique. The ferroelectric properties of the thin films are greatly affected by the presence of various kinds of defects. Detailed x-ray diffraction data and…