Materials Literature
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We describe the formation of efficient transmission diffraction gratings created from patterned high quality ligand-capped CdSe nanocrystals (NCs), using a facile microcontact molding procedure. Soft polymer replicas of commercially available master gratings were "inked" with solvated NCs and the resulting pattern tra…
The dielectric response of (1−x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-x%PT,4.5≤x≤12) single crystals is reported for ac field amplitudes up to ∼2 kV/cm at 1 kHz. The Rayleigh law is used to study the dielectric nonlinear response. It is found that the extrinsic contributions are extremely anisotropic. Rhombohedral crystals po…
Energy transfer from water-soluble quantum dots (QDs) to porphyrinlike sensitizers is studied by time-resolved spectroscopy of two-photon excitation with femtosecond laser pulses. Evident transfer results are observed. Electron exchange is found to be the dominant transfer mechanism. Relative intensity change between…
In order to examine atomic and electronic structures of the perimeter of Au-particle/${\text{TiO}}_{2}$ systems related to the catalytic activity, we perform density-functional theory calculations of Au-rod/${\text{TiO}}_{2}(110)$ models with the relationship of $\text{Au}(111)[0--11]\ensuremath{\parallel}{\text{TiO}}…
Phase separation into a ferromagnetic (FM) metallic and a charge-ordered (CO) insulating state as found in the manganite ${({\text{Pr}}_{1\ensuremath{-}y}{\text{La}}_{y})}_{0.7}{\text{Ca}}_{0.3}{\text{MnO}}_{3}$ (PLCMO) is expected to be sensitive to structural changes. Reversible biaxial strain has been applied to ep…
The elastic properties of thermoplastic elastomers based on poly(tetramethylene oxide) and monodisperse amide hard segments (HS) were studied in compression and tensile mode as well as with stress relaxation (SR) measurements. For these copolymers the compression set values were low and increased with the modulus and…
We calculate the band structure and the conductance of periodic edge-corrugated graphene nanoribbons within the framework of the tight-binding $p$-orbital model. We consider corrugated structures based on host ribbons with armchair and zigzag edges and three different types of corrugations (armchair edges, zigzag edge…
A conductive atomic force microscopy (C-AFM) study on a positive temperature coefficient of resistance (ptcr) BaTiO3 thermistor is reported. The method provides imaging of the dielectric properties with a lateral resolution on the nanometer scale. Measurements were carried out in the temperature range of 25–250 °C to…
Abstract Single phase nanocrystalline La0.6Ca0.4MnO3 powder was synthesized by both the usual and a modified citrate gel precursor method, and the effects on the formation of homogeneous nano-sized powder with a perovskite structure were investigated. In the modified method, single phase La0.6Ca0.4MnO3 powder with an…
Abstract Herein we report on the synthesis and characterization of the new borane adducts Htbo · BH 3 and Htbn · BH 3 (two isomers), where Htbo = 1,4,6‐triazabicyclo[3.3.0]oct‐4‐ene and Htbn = 1,5,7‐triazabicyclo[4.3.0]non‐6‐ene. Thermal treatment of these adducts leads to dihydrogen elimination and the formation of d…
Spatial homogeneity of polarization relaxation behavior on the surface of 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 crystals in the ergodic relaxor phase is studied using three-dimensional time-resolved spectroscopic piezoresponse force microscopy. The number of statistically independent components in the spectroscopic image is d…
In this paper, ultrathin (about 2.5 nm) manganite (MnOOH) nanowires were synthesized by a simple wet chemical method at ambient temperature. Temperature-dependent phase transition patterns of the prepared nanowires under different atmospheres were systematically studied with thermogravimetric and differential thermal…
Hard and soft x-ray photoelectron spectroscopies (called HAXPES and SXPES) were performed at ∼8 and ∼1.25 keV for the metal–insulator transitions (MIT) system VO 2 . From the sharp difference between HAXPES and SXPES in the O 1s spectra, it was found that the clean surface of the metal VO 2 is covered with a less itin…
A diamond-shaped P-doped ZnO nanostructure was fabricated on a Si (100) substrate by a chemical vapor deposition method. The photoluminescence properties of the ZnO nanostructure were studied with a temperature range from 81 to 306 K. At 81 K, a series of transitions of donor−acceptor pairs and their phonon replicas w…
Homoepitaxial SrTiO3 thin films grown by molecular beam epitaxy are analyzed using high-resolution x-ray diffraction and transmission electron microscopy. Measured 00L x-ray scans from stoichiometric and nonstoichiometric films are compared with calculations that account for the effects of film thickness, lattice para…
In this paper, the calcium carbonate (CaCO 3 ) crystallization controlled by imidazolium based ionic liquids (ILs) was investigated. 1-Dodecyl-3-methylimidazolium bromide ([C 12 mim]Br) and 1-butyl-3-methylimidazolium bromide ([C 4 mim]Br) were chosen as crystal growth template. Rodlike and dendritelike aragonite nano…
In this work, a three-dimensional model of a solid oxide fuel cell (SOFC) stack is developed to predict the temperature distribution across the stack. The model simulates a particular SOFC stack comprising of five single cells. Isothermal and adiabatic walls are chosen as the different boundary conditions in order to…
Scanning tunneling spectroscopy was performed on a (15,0) single wall carbon nanotube partially wrapped by poly(3-hexyl-thiophene). On the bare nanotube section, the local density of states is in good agreement with the theoretical model based on local density approximation and remarkably is not perturbed by the polym…
We report a large voltage gain of 130, together with a high magnetoelectric voltage coefficient of 7.6 V/Oe, in a long-type heterostructure made by combining a coil-wound, length-magnetized magnetostrictive Tb0.3Dy0.7Fe1.92 (Terfenol-D) alloy plate and a length-polarized piezoelectric 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 sin…
Orthorhombic YMnO3 epitaxial thin films were grown on Nb(0.5%)-doped SrTiO3(001) substrates. Film’s thickness was varied to tune the epitaxial strain. Structural and magnetic properties are well correlated, presenting a more pronounced ferromagnetic behavior as the unit cell becomes more distorted. Dielectric properti…