Materials Literature
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Successful fabrication of epitaxial thin films of La 2- x Sr x NiO 4 (0.5≤ x ≤1.4) has enabled us to investigate the change in charge dynamics upon the insulator–metal transition (IMT). The charge gap induced by (π,π) charge ordering as observed in optical spectra for x =0.5 is decreased with the increase of x , while…
Zwischen nahem UV und Grün lässt sich die Emission von Nanopartikeln von 1,3-Diphenyl-5-pyrenyl-2-pyrazolin (DPP; siehe Bild) abstimmen, wobei die Farbe des Lichts durch die Anregungswellenlänge und durch die Partikelgröße beeinflusst wird. In Lösung beobachtet man dagegen nur die Emissionscharakteristiken des Pyren-,…
The resonance-type energy transfer process has been investigated for the first time in Ce and Eu co-doped CaGa 2 S 4 polycrystalline samples with different dopant concentrations in the range from 0.2 at.% to 4 at.%. The energy transfer from Ce to Eu ions increases with increasing Ce and Eu concentrations. The values o…
A quantitative analysis of the (2×1) reconstruction of the diamond (111) surface by low-energy electron diffraction (LEED) is presented. Spot intensity versus energy data, I (E), were collected for normal incidence up to electron energies of 500 eV and analysed using the tensor LEED perturbation method. A close fit be…
Relaxation modes and rates of a polymer chain in a melt are studied by Monte Carlo simulations of the bond fluctuation model, where only the excluded volume interaction is taken into account. Polymer chains, each of which consists of N segments, are located on an L × L × L simple cubic lattice under periodic boundary…
We report on magnetometry, resistivity and Mössbauer spectroscopy measurements on single-phase Fe 3 BO 5 in a wide temperature range from 4.2 to 620 K. Magnetically split Mössbauer spectra were observed below T N = 114 K, although a proportion of the Fe 2+ ions in the basal plane (crystallographic site Fe1) remain par…
Reaction of [(Me3tacn)V(CF3SO3)3] (Me3tacn = N,N',N''-trimethyl-1,4,7-triazacyclononane) with LiCN in DMF results in oligomerization of cyanide to form [(Me3tacn)2V2(CN)4(mu-C4N4)]. The structure of this binuclear complex features a planar tetracyanide unit bridging two VIV centers via imido type linkages. The conjuga…
Several cofacial phthalocyanines (Pcs) with an Si-Si linkage were obtained by one-step condensation of 1H-isoindole-1,3(2H)-diimine with hexachlorodisilane as template in quinoline. They were characterized by gel-permeation chromatography, IR, NMR spectroscopy, and mass spectrometry, and cyclic voltammetry. The result…
Die wohldefinierte Anordnung von Poren und Wänden aus Nanokristalliten in einem mesoporösen Titanoxid-Dünnfilm kann mit hohen Konzentrationen (bis zu 8 Mol-%) von Eu3+ unter Bildung eines rot photolumineszierenden Materials dotiert werden (siehe Bild). Die Photolumineszenz stammt von einem Energietransfer von den Band…
The finite-difference time-domain method has been used in the numerical analysis of the optical diffraction properties of a liquid crystal phase grating. The grating is formed using a nematic material that is switched using striped electrodes with a unity mark-space ratio. Three different surface pretilts have been in…
Radiation damage and recrystallization in natural zircons have been studied by analysing Si-O stretching overtones/combinations, hydrous species, and U-ion spectra in the frequency region between 1200 and 11 000 cm -1 . The effects of radiation are characterized by a dramatic variation of intensity, a decrease in freq…
Band-edge emission of ZnO at around room temperature was investigated by measuring the temperature dependence of cathodoluminescence spectra at 20–300 K. Undoped crystals grown by a vapor transport method and Al-doped crystals by flux method were employed to elucidate the effect of doping on luminescence properties. F…
Extensive isothermal-isobaric (NPT) molecular dynamics simulations at many different temperatures and pressures have been carried out in the well-known Kob–Andersen binary mixture model to monitor the effect of pressure (P) and temperature (T) on the dynamic properties such as the viscosity (η) and the self-diffusion…
The energy-versus-volume curve of the spin-density wave (SDW) in body-centred-cubic Cr is calculated with the density functional theory/full-potential linearized augmented plane wave (DFT/FLAPW) method using the generalized gradient approximation (GGA). The predicted ground state is not the SDW, in contrast to an earl…
DOTA was conjugated to the N-terminus of a 12-mer peptide by using standard peptide synthesis chemistry. The peptide, first isolated by phage display, maintained a high affinity for its protein-binding target, Gal-80, even with GdDOTA attached. The high affinity constant (KA = 5 x 105 M-1) combined with the high relax…
The synthesis and characterization of well-dispersed, CoFe 2 O 4 nanoparticles within a polymer matrix at room temperature are reported. Comparable inorganic synthetic methods require heating at high temperatures in order to produce this particular mixed-metal oxide composition. Our modification of prior reported temp…
Unintentionally doped ZnO layers grown epitaxially on a sapphire substrate have been exposed either to a hydrogen or deuterium plasma. Secondary ion mass spectroscopy measurements performed subsequently showed a rapid diffusion of hydrogen in these layers. Furthermore, the presence of hydrogen in the ZnO samples is fo…
A detailed systematic study on the growth morphology of carbon nanotubes (CNTs) on Si in atmospheric pressure thermal chemical vapor deposition was undertaken. The role of NH3 for vertical alignment of CNTs was investigated. The direct cause for the alignment was a dense distribution of the catalytic metal particles,…
We have demonstrated the change of the Raman spectra in F-doped silica glasses with various fictive temperatures, and have also presented a useful peak-deconvolution technique for evaluating the relative concentration of D1 and D2 bands that could be attributed to four- and three-membered ring structures. The intensit…
Eine bemerkenswerte Relaxationsverstärkung von Wasserprotonen wurde in Lösungen nachgewiesen, die mit GdHPDO3A beladenes Apoferritin (siehe Abbildung) enthalten. Der Einschluss des Komplexes im Apoferritin (innerer Durchmesser: 7.5 nm, äußerer Durchmesser: 12.5 nm) erhöht die Anzahl dipolarer Wechselwirkungen zwischen…