Materials Literature
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Photoinduced fluorescence enhancement (PFE) in colloidal CdSeTe∕ZnS core/shell quantum dots (QDs) was investigated by monitoring ensemble fluorescence and single-QD fluorescence blinking behavior upon illumination. Ensemble fluorescence was increased in air and in vacuum with different enhanced factors. At the single-…
Abstract Bis‐ o ‐iminobenzosemiquinonato zinc and cadmium complexes M(ISQ‐Pr i ) 2 (M = Zn, 1 ; M = Cd, 2 ) were found to be diradical complexes of a distorted tetrahedral geometry according to X‐band EPR spectroscopy. Tetrahedral structure of zinc complex 1 was confirmed by X‐ray diffraction analysis. The spectro‐ an…
This report concerns the magnetic properties of colloidal Ni nanoparticles (NPs) obtained by chemical reduction of Ni(II) salt in an organic solvent. The NPs present a complex and disordered atomic structure, where small clusters of a few Ni atoms appear to coexist within each NP. These NPs exhibit interesting magneti…
Theoretical and experimental studies on Seebeck effect in EuTe∕PbTe superlattices were performed. Theoretical calculations, which take into account temperature dependent band gap, nonparabolicity, and anisotropy of effective masses in the PbTe conduction band, were performed in the framework of Boltzmann equation in w…
Bi 1.5 Zn 1.0 Nb 1.5 O 7 ∕ Mn -doped Ba0.6Sr0.4TiO3 heterolayered thin films were deliberately deposited on Pt∕Ti∕SiO2∕Si substrate by pulsed laser deposition and used as tunable materials. The hetero-layered films exhibit prominently enhanced tunable performance compared to previous reported dielectric/ferroelectric…
We present predictions for the static scaling exponents and for the cross-over polymer volumetric fractions in the marginal and concentrated solution regimes. Corrections for finite chain length are made. Predictions are based on an analysis of correlated fluctuations in density and chain length, in a semigrand ensemb…
A systematic investigation on the effect of R doping, particularly the magnetic coupling between R and Fe, has been performed for the La1−xRxFe11.5Si1.5 intermetallics (R=Ce, Pr, and Nd). A magnetic interaction comparable to that between Fe atoms is found between the R and Fe atoms, which causes an enhancement of the…
The transport properties of field-effect transistors based on C60 fullerene peapods have been investigated and our findings indicate that the transport characteristics of single-walled carbon nanotubes (SWNTs) are highly sensitive to the encapsulated fullerenes due to the charge-transfer effect. Under light illuminati…
Abstract LnCuSe 2 compounds crystallize either in the monoclinic LaCuS 2 (space group P 2 1 / c ) or the trigonal CaLi 2 Si 2 (space group $P{\bar 3}m{\rm 1}$ ) type of structure. The first group is formed by the light rare‐earth elements (Ln = La, Ce, Pr, Nd, Sm, Gd and Tb), the second by the heavier rare‐earth eleme…
Fe, Cu co-doped In2O3 nanocrystals were synthesized by a coprecipitation method. Phase analyses revealed that Fe ions have high solubility (up to 15.4at.%) in the In2O3 matrix, while the Cu ions strongly restrain In2O3 phase transition from cubic to hexagonal. Raman spectroscopy shows that by adding Cu ions, the defec…
The absorption peak of gold (Au) nanoparticles doped in liquid crystal (ANDLC) is controllable by applying an external applied voltage before aggregation occurs. Au nanoparticles aggregate when the dielectrophoresis force, which is induced by the gradient of the square of the electric filed close to the sides of the h…
Abstract A novel decaborate compound, [Ag(py) 2 ] 2 [B 10 O 14 (OH) 4 ] (py = pyridine) ( 1 ), has been hydrothermally synthesized and structurally characterized by single crystal X‐ray diffraction, FTIR, elemental analysis, and thermogravimetric analysis. The compound crystallizes in the monoclinic system, space grou…
Ringe in Aufruhr: Der Einschub eines verdrehten Pyrrolrings destabilisiert ein Mesoarylsapphyrin-Gerüst und erzwingt einen Ringschluss. Die anschließende Metallierung mit Rhenium resultiert in einer weiteren Anellierung unter Bildung eines Sapphyrins mit fünf anellierten Ringen (siehe Schema).
Abstract By the synthesis of single‐crystalline K + , Rb + , Cs + and Ba 2+ salts of the ortho ‐sulfidostannate anion, using an efficient, three‐step fusing/extraction/evaporation method, all of the “missing links” in the table of ortho ‐sulfidostannates that can be prepared by this method, were added. The resulting h…
Electronic band structures of single-walled silicon carbide nanotubes are studied under uniaxial strain using first principles calculations. The band structure can be tuned by mechanical strain in a wide energy range. The band gap decreases with uniaxial tensile strain, but initially increases with uniaxial compressiv…
Abstract Hexa(2‐formylphenoxy)cyclotriphosphazene ( o ‐CHO‐C 6 H 4 O) 6 N 3 P 3 ( 2 ) was obtained from the reaction of hexachlorocyclotriphosphazene ( 1 ) with salicylaldehyde in the presence of K 2 CO 3 in THF solvent. A series of Schiff bases containing cyclotriphosphazenes such as [ o ‐(C 6 H 5 N=CH)C 6 H 4 O] 6 N…
Heterojunctions composed of La0.7Ca0.3MnO3 and 0.05wt% Nb-doped SrTiO3 were fabricated using pulse laser deposition. The current-voltage characteristics of such heterojunctions can be described by tunneling with an effective Schottky barrier. These junctions showed significant response to ultraviolet and visible light…
Chitosan nanowires (see figure) are successfully fabricated on a stainless steel substrate by a nonaqueous electrochemical route that does not require a template, catalyst, or surfactant. The nanoscale morphology of the final products – nanoflakes, nano wires, nanobelts, nanorods, and nanotubes – can be easily tuned b…
Flexible all-organic polymer-dispersed liquid crystal (PDLC) devices were fabricated by using highly transparent and conductive poly(3,4-ethylenedioxy thiophene): p-toluene sulfonate (PEDOT:PTS) films, as electrode layers. These conductive PEDOT:PTS films have a high transparency up to 80%, and possess a very low shee…
A new ion-transfer-based mechanism is proposed for the growth of CuTCNQ nanowires within the confines of an anodic aluminum oxide template. Remarkably, Cu ions are found to move across the growing solid single-crystalline nanowire at a very high rate with macroscopic distance, as schematically illustrated in the figur…