Materials Literature
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Freigelegt! Mit einer templatgestützten Elektroabscheidung gelang die Synthese stabiler Netzwerke aus Metall- oder Halbleiternanodrähten (siehe Schema). Dazu wurde a) mesoporöses Siliciumdioxid an einer Elektrode abgeschieden, b) die Kanäle mit dem Metall oder Halbleiter gefüllt und c) das Templat entfernt, um das Nan…
Abstract Chemisorption of the oxygen molecule on the (100) surface of γ‐uranium was investigated using the generalized gradient approximation to Density Functional Theory. Dissociative adsorptions of O 2 are found to be significantly favored compared to molecular adsorptions. Interstitial adsorptions of molecular oxyg…
The synthesis of a novel water-soluble hyperbranched polyurethane is described. The synthetic strategy involves a new approach to hyperbranched polymerization through the selective activation of the A functionality of the unprotected of AB 2 monomer. 1,1‘-Carbonyl diimidazole is added at room temperature to an amino-d…
We demonstrate here the single-atom migration of Tb, Gd, or Ce metal from cage to cage through an intentionally induced atomic path within a carbon nanopeapod. The atomic path is actually an atomic defect (vacancy) induced at the fullerene cage during TEM observation. It is therefore proved that the atomic cage can be…
Two- and three-dimensional Au nanoparticle/[tetrakis( N -methylpyridyl)porphyrinato]cobalt (CoTMPyP) nanostructured materials were prepared by “bottom-up” self-assembly. The electrocatalytic and plasmonic properties of the Au nanoparticle/CoTMPyP self-assembled nanostructured materials (abbreviated as Au/CoTMPyP SANMs…
We employ a theoretical model to calculate mechanical characteristics of macroscopic mats and fibers of single-walled carbon nanotubes. We further investigate irradiation-induced covalent bonds between nanotubes and their effects on the tensile strength of nanotube mats and fibers. We show that the stiffness and stren…
Coronene is a highly symmetric organic molecule whose molecular structure resembles a fragment of graphite. We have crystallized a charge-transfer complex based on coronene and TCNQ, and present crystal structure and transport properties. The complex adopts alternate stacking between coronene and TCNQ, and the charge-…
Spectroscopic properties of ${\mathrm{Eu}}^{3+}$ ions $(<0.1\phantom{\rule{0.3em}{0ex}}\mathrm{at}\phantom{\rule{0.2em}{0ex}}%)$ at two main sites of BaFCl microcrystals are investigated. For ${\mathrm{Eu}}^{3+}$ ions at site I the energy levels and luminescence intensity distribution are similar to most other norm…
The crystal and magnetic structures of the $(\mathrm{La}A)\mathrm{Co}\mathrm{Nb}{\mathrm{O}}_{6}$ ($A=\mathrm{Ca}$, Sr, and Ba) double perovskites have been investigated. The $A=\mathrm{Ca}$ and Sr compounds crystallize with a monoclinic $P{2}_{1}∕n$ superstructure while the larger $A=\mathrm{Ba}$ gives a tetragonal $…
We have studied vacuum ultraviolet (VUV)-induced damage processes in BaMgAl 10 O 17:Eu 2+ using a unique accelerated life-testing device. Emission, excitation, and reflectance spectra of doped and undoped samples before and after VUV damage reveal two independent mechanisms of degradation. The observed color shift in…
The dimeric, pentacopper(II) substituted tungstosilicate [Cu(5)(OH)(4)(H(2)O)(2)(A-alpha-SiW(9)O(33))(2)](10-) (1) has been synthesized in good yield using a one-pot procedure by reaction of Cu(2+) ions with the trilacunary precursor salt K(10)[A-alpha-SiW(9)O(34)]. The title polyanion represents the first polyoxotung…
A flow-through-type DNA array fabricated from an ideally ordered anodic porous alumina substrate is reported. Single-stranded probe DNA was affixed to the walls of the sub-micrometer-diameter holes, and fluorescently labelled target DNA was passed through the holes in the substrate. Fluorescence microscopy revealed an…
High energy $(67\phantom{\rule{0.3em}{0ex}}\mathrm{keV})$ x-ray diffuse scattering measurements were performed on single crystals of $\mathrm{Pb}({\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}x\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ $(\mathrm{PZN}\text{\ensuremath{-}}x\mathrm{PT})$, to ma…
Relatively low magnetic fields applied parallel to the axis of a chiral single-walled carbon nanotube are found causing large modulations to the p channel or valence band conductance of the nanotube in the Fabry-Perot interference regime. Beating in the Aharonov-Bohm type of interference between two field-induced nond…
Biocompatible nanotubes: Glycosylated polymers designed to mimic natural mucins were assembled on carbon nanotubes (see picture). Carbon nanotubes coated with mucin mimics were soluble in water, resisted nonspecific protein binding, and bound specifically to biomolecules through receptor–ligand interactions.
The electrochemical cyclic voltammetric (CV) oxidation behavior of an arc-derived single-wall carbon nanotube (SWNT) sample in potassium hydroxide solution was investigated. Amorphous carbon in the as-grown SWNT sample was effectively removed by the CV oxidation, as confirmed by analyzing the sp 3 /sp 2 carbon ratio f…
Using an ab initio total energy approach, we study the stability of free and Ag(111)-supported MgO(111) ultrathin films. We unravel a novel microscopic mechanism of stabilization of polar oxide orientations, based on a strong modification of the MgO structural phase diagram with respect to the bulk material. We predic…
Within the framework of the phenomenological Ginzburg-Landau theory influence of metallic electrodes on the properties of thin ferroelectric films is considered. The contribution of the metallic electrodes with different screening length of carriers is included in functional of free energy. The influence of convention…
Carbon nanotube field-effect transistors with sub-20 nm long channels and on/off current ratios of >10(6) are demonstrated. Individual single-walled carbon nanotubes with diameters ranging from 0.7 to 1.1 nm grown from structured catalytic islands using chemical vapor deposition at 700 degrees C form the channels. Ele…
Besonders effektiv: Durch Selbstorganisation von Triazacyclonan-funktionalisierten Thiolen auf der Oberfläche von nanometergroßen Goldpartikeln sind funktionalisierte Goldnanopartikel einfach zugänglich. Durch Komplexierung mit ZnII werden sie zu leistungsfähigen Katalysatoren für die Spaltung von Phosphatestern (sieh…