Materials Literature
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Bestrahlung von Vesikeln: Die Umwandlung von Vesikeln in eine Fasernanostruktur gelingt durch Photolyse und Reorganisation einer dendritischen Baueinheit mit 2-Nitrobenzylgruppe (siehe Bild). Supramolekulare Aggregate aus einem Amiddendron mit photochemisch isomerisierbarer Azobenzoleinheit setzen eingeschlossene Mole…
We observe room temperature (RT) visible and infrared (IR) photoluminescence (PL) bands peaked around 680 and 1020nm, respectively, from a silicon (Si) surface amorphized and patterned with ripples by 60keV Ar+ bombardment at 60° angle of ion incidence. However, the Si surface amorphized but not patterned under normal…
Thin Ga0.94Mn0.06As layers have been grown by low temperature molecular beam epitaxy on (110) GaAs substrates and on [110] and [−110] oriented GaAs cleaved edges. The Curie temperatures TC for the as-grown samples ranges from 46to80K. After annealing at low temperatures TC increases up to 115K. In addition, magnetic a…
Abstract Synthesis of high temperature polyimide foams with pore sizes in the nanometer range was developed. Foams were prepared by casting graft copolymers comprising a thermally stable block as the matrix and a thermally labile material as the dispersed phase. The copolyimides as the matrix material were prepared vi…
Computer modeling and simulation reveals a grain size- and composition-dependent behavior of phase coexistence around the morphotropic phase boundaries in polycrystals of ferroelectric solid solutions. It shows that the width of phase coexistence composition range increases with decreasing grain sizes; phase-coexistin…
The electronic state of two-dimensional organic conductor, $\ensuremath{\theta}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{Cs}\mathrm{Zn}{(\mathrm{S}\mathrm{C}\mathrm{N})}_{4}$, has been investigated by means of $^{13}\mathrm{C}\text{\ensuremath{-}}\mathrm{NMR}$ line shape analys…
(001) oriented Pt thin films with excellent single crystal quality were epitaxially grown on (001) SrTiO3. The interface relationship was determined and shown to be (001)Pt∥(001)STO and [100]Pt∥[100]STO. Two unexpected “transitions” were found at 138 and 34K in the evolution of resistivity with temperature as the samp…
We report that the elasticoluminescent (elastico-L) material SrAl2O4:Eu2+ (SAO-E) shows an extraordinarily anisotropic thermal expansion: the linear thermal expansion coefficient in the c axis was one order of magnitude smaller than those in the a and b axes in the monoclinic phase. This anisotropic lattice behavior w…
Nuclear-density distribution of cubic Ce0.5Zr0.5O2 compound has been studied at 1832K by the maximum-entropy method (MEM) and MEM-based pattern fitting combined with the Rietveld method using in situ neutron powder diffraction data. The oxygen ions show a large positional disorder and shift to the ⟨111⟩ directions. Po…
Using density functional theory, we investigate the difference in the reactive pathways and potential-energy surfaces for the dissociative adsorption of oxygen $({\mathrm{O}}_{2})$ on platinum (Pt) and gold (Au) surfaces. We found that the reactivity on Au surface can be improved by changing the surface structure. How…
Ab initio phonon calculations on NiAs-type (B8) MgTe are performed to probe the structural behaviors of MgTe under high pressure. We predicted an unstable transverse acoustic mode and a phase transition of B8→orthorhombic Pnma (B31) driven by this soft mode is thus identified. The polymorph of B31 in MgTe adopts MnP-t…
Abstract A 15‐membered macrocyclic ligand L 1 H 3 was designed with the aim of sensitizing the visible luminescence of the Tb III ion in water: this octadentate chelating ligand is based on an intracyclic N , C ‐pyrazolylpyridine chromophore and a diethylenetriaminetriacetic acid core. This ligand reacts with equimola…
We present a theoretical investigation of magnetism in II-VI diluted magnetic semiconductor nanocrystals (NCs). The energy spectra, magnetizations, and magnetic susceptibilities of singly charged NCs with few substitutional magnetic ${\mathrm{Mn}}^{2+}$ ions are studied as functions of NC size, magnetic dopant distrib…
The effects of pressure and hydrogenation, the former causes a lattice contraction while the latter causes an expansion of the sample, have been systematically studied for LaFe13−xSix (x=1.3–2.1). It is found that the typical change of the Curie temperature is ∼150K when ∼1.6H∕f.u. is absorbed and ∼−106K as the pressu…
The density functional theory based first-principles calculations and a recently proposed chemical bond method are used to investigate the elastic and compressibility properties of the rocksalt, wurtzite, and zinc-blende phases of ZnO. The calculated bulk moduli from these two means explain the discrepancy between the…
We present the structural, dielectric and magnetization study of single phase polycrystalline BixCo2−xMnO4 (0⩽x⩽0.3), synthesized by a conventional solid state route. All the samples have the cubic spinel structure with Fd3m space group. Bi-substitution in Co2MnO4 stabilizes the ferroelectric transition at a temperatu…
Rigorous coupled wave analysis (RCWA) interprets 3D white-light interference microscopy profiles and reveals the dimensions of optically-unresolved surface features. Measurements of silicon etch depth of a 450-nm pitch grating structure correlate to atomic force microscopy with R(2)= 0.995 and a repeatability of 0.11n…
Down-conversion in lanthanide doped luminescent materials is a promising route to significantly enhance the energy efficiency of silicon solar cells, plasma display panels, or mercury-free lighting tubes because it results in the emission of two photons for each absorbed higher energy photon. The ${\mathrm{Gd}}^{3+}∕{…
This letter presents direct evidence for the existence of the same inherently polar one-dimensional (1D), displacive disorder in BaTaO2N as occurs in paraelectric BaTiO3 as well as in doped BaTiO3 relaxor ferroelectric systems. The inherently polar, off-center and oppositely directed displacements of Ta and neighborin…
A double substrate “sandwiching” structure has been designed and tested for molecular detection using surface enhanced Raman scattering (SERS). With silver (Ag) nanoparticles as SERS substrates and rhodamine 6G (R6G) as a test molecule, the results show that the “sandwich” configuration exhibits significantly higher S…