Materials Literature
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Upright-standing nanocrystalline ZnO films, with the c-axis parallel to the substrate, are fabricated by the pyrolysis of films made of upright-standing sheets of layered hydroxide zinc carbonate (LHZC) (see Figure). Dye-sensitized solar cells (DSCs) prepared using the ZnO films possess the highest level of conversion…
A novel method for the synthesis of highly monodispersed hydrophillic InP-ZnS nanocrystals and their use as luminescence probes for live cell imaging is reported. Hydrophobic InP-ZnS nanocrystals are prepared by a new method that yields high-quality, luminescent core-shell nanocrystals within 6-8 h of total reaction t…
Nitrogen doping of single and multi-walled carbon nanotubes is of great interest both fundamentally, to explore the effect of dopants on quasi-1D electrical conductors, and for applications such as field emission tips, lithium storage, composites and nanoelectronic devices. We present an extensive review of the curren…
The possibility of using plasmonic and metamaterial covers to drastically reduce the total scattering cross section of spherical and cylindrical objects is discussed. While it is intuitively expected that increasing the physical size of an object may lead to an increase in its overall scattering cross section, here we…
Cadmium tungstate (CWO) films on glass substrate have been first prepared by hydrothermal method at temperatures ranging from 120 to 180 °C from cadmium nitrite and tungstic acid in hydrogen peroxide solution. Crack free and dense CWO films with textured structure and thickness up to 8 μm were formed at 150 and 180 °C…
The complex [Fe(teec)6](BF4)2 (teec = chloroethyltetrazole) shows a two-step complete spin-crossover transition in the temperature range 300-90 K. Time-resolved synchrotron powder diffraction experiments have been carried out in this temperature range, and crystal structure models have been obtained from the powder pa…
We report procedure with use of self-assembled silicon carbide (SiC) nanomasks for preparation of ultrahigh-density Si nanotips. Si nanotips with SiC apex may be firstly prepared in a CH4∕H2 plasma treatment and in a subsequent H2 plasma etching a SiC apex may be converted into an amorphous silicon (a-Si) one with an…
We investigate the magnetic properties of two typical II-VI semiconducting nanocrystals, namely, ZnS and ZnO, doped with various concentrations of a transition metal ion, Mn. A wide range of dopant concentrations was explored without changing the size of the nanocrystal, thereby allowing us to study the concentration…
Poly-beta-hydroxyalkanoates (PHA) polymer is synthesized by different bacterial species. There has been considerable interest in the development and production of biodegradable polymers; however, the high cost of PHA production has restricted its applications. Kraft cellulose industry effluents containing 2,4,6-trichl…
Abstract We examine the effects of controlling nanoscale architecture on the tensile properties of honeycomb‐structured silica/polymer composite films. The hexagonal films are produced using evaporation‐induced self‐assembly and uniaxially strained using a home‐built tensile testing apparatus. Significant differences…
We present the experimental demonstration of imaging by all-angle negative refraction in a 3D photonic crystal flat lens at microwave frequencies. The flat lens is made of a body-centered cubic photonic crystal (PhC) whose dispersion at the third band results in group velocity opposite to phase velocity for electromag…
Durch chemische Gasphasenabscheidung von Ethen wurden Kohlenstoffnanofasern (CNFs) auf der Oberfläche oder im Innern von Aktivkohle immobilisiert (siehe Bild). Experimente zeigen, dass diese Form der Nanostrukturierung neuartige Adsorptionsstellen auf der Oberfläche der Aktivkohle bereitstellt.
Uniformly cold-compressed nanographite sheets in diamond anvil cells (DAC) are found to transform from soft into hard phase at about 17 GPa using molecular dynamics simulations. The hard phase can reach the compressive strength of about 150 GPa. Finite element analyses show that high stress concentrations occur along…
Die Verknüpfung der Strukturmotive 21,23-Dithiaporphyrin und Acetylen liefert das einzigartige 18-π-aromatische [18]Triphyrin(4.1.1)-Gerüst (siehe Struktur; C grau, N blau, S gelb). Die Butineinheit, die die beiden Thiophenringe verbindet, weicht leicht von der Linearität ab und beschreibt einen aus dem Makrocyclus we…
Abstract F‐18‐labeled porphyrins, the potential tracing and detecting agents for tumor have been synthesized and characterized by two convenient routes: one is a mixed aldehyde condensation, which involves acid‐catalyzed condensation of pyrrole, m ‐anisaldehyde and 4‐[ 18 F]fluorobenzaldehyde. The other is the acid‐ca…
Doping into nanotubes is an attractive and significant way to tailor their electron transport and emission properties. This article reviews some recent experimental and theoretical advances in the studies of doping behaviors in carbon nanotubes and gallium nitrogen nanotubes, and doping effects on their field electron…
Inelastic neutron-scattering spectra were measured on stoichiometric ${\mathrm{Fe}}_{0.50}{\mathrm{Cr}}_{0.50}$ prepared as a body-centered-cubic (bcc) solid solution, and after increasing amounts of chemical unmixing on the bcc lattice induced by annealing the solid solution at 773 K. These spectra were reduced by a…
Nanoparticulate ferrites such as manganese zinc ferrite and nickel zinc ferrite hold great promise for advanced applications in power electronics. The use of these materials in current applications requires fine control over the nanoparticle size as well as size distribution to maximize their packing density. While th…
A ceramic sample of a layered cuprate of Tl 2 Ba 2 Ca 2 Cu 3 O x and Tl 2 Ba 2 Ca 1 Cu 2 O x , so-called Tl-based 2223 and 2212 compounds, was investigated by the measurement of the dielectric constants (ε′ and ε′′), the dielectric loss (tanδ), and the conductivity (σ ac ) as a function of temperature (80–300 K) and f…
Fusion of the structural motifs 21,23-dithiaporphyrin and acetylene yields the 18-π-aromatic [18]triphyrin(4.1.1) framework (see structure; C gray, N blue, S yellow). The butyne moiety that joins the two thiophene rings reveals a slight distortion from linearity, showing a bowlike deformation directed out of the macro…