Materials Literature
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This study investigated the origin of dielectric loss induced by O2 plasma on organo-silicate glass low-k dielectrics. The contributions from the polarization components to dielectric constant were delineated by analyzing the results from capacitance-voltage measurement, spectroscopic ellipsometry, and Fourier transfo…
Gels for cells: Hybrid nanogels (see image) that are easily taken up by living cells are prepared with colloidal and temperature-sensitive properties. Integration of reactive nanoparticles (NPs) into the colloidal network during polymerization reduces the colloid dimensions and creates a core–shell structure that isol…
Ultrafast charge dynamics in one-dimensional Mott insulators was investigated by femtosecond reflection spectroscopy on three organic molecular compounds, K–tetracyanoquinodimethane (TCNQ), Rb–TCNQ, and bis(ethylenedithio)tetrathiafulvalene (ET)–difluorotetracyanoquinodimethane (F 2 TCNQ) with different magnitudes of…
Abstract Raman spectroscopy using a hot stage was used to characterise layered double hydroxides (LDHs) of the formula (Cu,Zn) 6 Al 2 (OH) 16 (CO 3 ) · 4H 2 O. The spectra were used to assess the molecular assembly of the cations in the LDH structure. The sharp band at 1058 cm −1 for the Zn 6 Al 2 (OH) 16 (CO 3 ) · 4H…
Abstract Uniform silver nanoparticles were obtained upon the reduction of silver ions by reduced polyoxometalates (POMs) by simple mixing at room temperature. Control of the size and the dispersity of silver nanoparticles was achieved by rate control. Faster reduction of Ag + led to smaller and more uniform silver nan…
The density of states of graphene has van Hove singularities that can be reached by chemical doping and have already been explored in photoemission experiments. We show that in the presence of Coulomb interactions the system at the van Hove filling is likely to undergo a Pomeranchuk instability breaking the lattice po…
Reduced graphite oxide (GO) has shown promise as a scalable alternative to mechanically exfoliated specimens. Although many measurements show that reduced GO has properties approaching those of pristine graphene, it has been difficult to quantify the extent to which the graphitic network is restored upon reduction. Ra…
Abstract Tetrakis[heptadecafluorononyl] substituted phthalocyanine complexes were prepared by template synthesis from 4‐(heptadecafluorononyloxy)phthalonitrile with Co(CH 3 COO) · 2 H 2 O or PdCl 2 in 2‐ N , N ‐dimethylaminoethanol. The corresponding phthalonitrile was obtained from heptadecafluorononan‐1‐ol and 4‐nit…
New thermochromic materials are reported, which are useful for application as time–temperature indicators (TTIs) in temperature regimes that are complementary to those accessible with existing technologies. The design approach involves incorporating small amounts (0.3–2.9 wt.-%) of the excimer-forming, photoluminescen…
The BiFeO3–Pb(Zr0.52Ti0.48)O3 composite film in which BiFeO3 nanoparticles are distributed in the Pb(Zr0.52Ti0.48)O3 matrix was prepared by electrophoretic deposition method. The microstructural characterization revealed the structural distortion of the BiFeO3 phase, induced by the unique BiFeO3–Pb(Zr0.52Ti0.48)O3 cor…
In this work, CdS nanocrystals (NCs) doped with Mn were synthesized in a glass matrix by fusion. The as-grown Cd1−xMnxS NCs were investigated by optical absorption, atomic force microscopy, and electron paramagnetic resonance (EPR). The incorporation of Mn2+ ions in CdS NCs was confirmed by an absorption transition bl…
Macrotubes with nanostructures are formed at rates of cm s−1 when aqueous zinc sulfate is injected into a silicate solution and a gas bubble is pinned to the reaction zone. Straight, long (>10 cm), and hollow structures with diameters of 500 μm can be grown, which upon heating are luminescent, and can photodegrade rho…
The reversible phase transfer of 2-(diethylamino)ethanethiol (DEAET)-stabilized CdTe nanoparticles (NPs) in a mixture of water and toluene is driven solely by temperature (see picture). Theoretical studies reveal that the net hydrophobic force of these NPs decreases at high temperature, thus favoring the transfer of N…
In the perspective of building an expanded electron-density library based on multipolar modelling for common chemical atom types, new consistent local axes systems are proposed. Optimal symmetry constraints can consequently be applied to atoms and a large number of multipole populations can be fixed to a zero value. T…
One dimensional zinc oxide nanostructures were grown by a low temperature hydrothermal process. Effects of Ga doping on the growth, crystallization, and defect distribution in them were studied by x-ray diffraction, scanning electron microscopy, photoluminescence, and Fourier-transform infrared spectroscopy techniques…
Als Radikal stabil: Die Titelverbindung 1 wurde synthetisiert und strukturanalytisch als stark aromatischer planarer Makrocyclus mit brillenförmiger Konformation charakterisiert (siehe Bild). Die erstmalige Einführung einer freien Meso-Position ist aussichtsreich für die Untersuchung neuer struktureller und elektronis…
A novel method for shaping and positioning ZnO nanoarchitectures using conventional lithography and catalyst-free metal organic vapor-phase epitaxy is demonstrated. Nanowalls and nanotubes of desired shapes and arrangements can be grown heteroepitaxially on Si substrates, and their electron-emission characteristics we…
A simple and dry method for colloidal semiconductor nanocrystal (NC) deposition on soluble organic semiconductor layers is developed, consisting of spin coating followed by poly(dimethylsiloxane) transfer. This technique is used to deposit a homogeneous layer of mixed red, green, and blue CdSe/ZnS quantum dots onto an…
Take the tube: A systematic approach was used to construct a series of functional nanotubes by cooperative self-assembly of dendrons and cyclodextrins and their nanotube–nanoparticle hybrids (see picture). The nanotubes are also capable of sensing proteins by inducing specific binding of proteins on the tube surface.…
Integrating nanostructured silicon materials with aqueous biological systems requires a suitable chemical passivation that can be controlled in a reproducible fashion. Herein, we investigate in detail a facile method to control both the stability of a porous silicon rugate filter and the degree to which the material c…