Materials Literature
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We report on the successful growth of homogeneous and well-covering ZnO nanowire arrays at a low temperature (90 °C) directly on a p-type Si(111) wafer by an electrochemical method. The wires were self-standing and vertically oriented. Room-temperature micro-Raman and photoluminescence emission analyses showed the hig…
The Ag nanoparticles-SiO2–ZnO film sandwiched structure was fabricated by depositing ZnO films on silica substrates which had been implanted by Ag ions. Enhancement of emission of the sandwiched structure was observed. The enhancement emission is caused by the resonant coupling between the surface plasmons of Ag and t…
Many organisms produce complex, hierarchically structured, inorganic materials via protein-influenced crystal growth--a process known as biomineralization. Understanding this process would shed light on hard-tissue formation and guide efforts to develop biomaterials. We created and tested a computational method to des…
Abstract Although many methods are available for the evaluation of the antioxidant capacity of samples presented in the liquid state, typically food and beverages, to date only the 2,2′‐diphenyl‐1‐picrylhydrazyl (DPPH) assay has been applied to the measurement of the antioxidant capacity of solid samples such as activ…
Interchain interactions between pi-systems have a strong effect on the electronic structure of conjugated organic materials. This influence has previously been explored by the spectroscopic and electrochemical characterization of molecules in which pairs of conjugated oligomers are held in a stacked fashion by attachm…
Bringing down the dendron: The deconstruction of self-assembling dendrons represents a new strategy for the rational design of libraries of self-assembling dendrons with unprecedented primary structure (see picture). In this strategy, molecular targets are designed by systematically removing branches from a parent den…
Mn-doped K0.5Na0.5NbO3 (KNN) thin films derived from chemical solution deposition have been investigated. 2 mol % manganese acetate was introduced into the polyvinylpyrrolidone-modified KNN precursor solution to prepare the KNN thin films. It was found that Mn doping can increase the dielectric constant and decrease t…
Single-layer graphene has received much attention because of its unique two-dimensional crystal structure and properties. In this review, we focus on the graphene devices in solution, and their properties that are relevant to chemical and biological applications. We will discuss their charge transport, controlled by e…
The critical concentration of superconductor-to-insulator transition in boron-doped diamond is determined in two ways, namely, the actual doping concentration of boron and the Hall carrier concentration. Hall carrier concentrations in (111) and (001) films exceed the actual doping concentration owing to the distortion…
Polyperoxides containing peroxy bonds as the main-chain repeating units are a new class of degradable polymers because of significant changes in their molecular weight and physical properties during a degradation process. In this study, the application of linear and network polyperoxides to dismantlable adhesion was i…
Alginate fibers have found many applications such as the preparation of dressings to treat exuding wounds, drug delivery, enzyme immobilization, etc.; however, their use is limited due to poor mechanical properties. Cellulose nanocrystals (CNCs) were isolated from cotton and introduced into calcium alginate fibers wit…
Temperature dependent Hall measurements were applied to demonstrate, semiconducting n-type high-quality In2O3(001) and (111) thin films with nondegenerate unintentionally doped (UID) electron concentrations on the order of 1017 cm−3 at room temperature, which is below those of bulk single crystals. The freeze-out of t…
Up to the neck! Bio-safe upconversion fluorescent nanocrystals (NaYF4:Er,Yb) and biocompatible superparamagnetic iron oxide nanocrystals (SPION) were effectively combined by means of a general “neck-formation” strategy, forming a size-controlled, Cd2+- and Gd3+-free, silica-shielded, magnetic upconversion fluorescent…
Rotationsprinzip! Die organisch-anorganische Käfigverbindung (HIm)2[KFe(CN)6] (1, HIm=Imidazolium) mit Perowskit-Struktur zeigt zwei Phasenübergänge bei 158 K und 187 K (siehe Bild mit den anisotropen dielektrischen Permittivitäten des Einkristalls). Die Übergänge lassen sich auf einen Wechsel der rotierbaren Gastmole…
An earlier synthetic procedure was adapted to produce water-dispersible, citrate-stabilized LaF 3 nanoparticles of 3−4 nm diameter, which exhibit a high degree of crystallinity (tysonite structure). The samples, as isolated from synthesis, consist of nanoparticles with a monolayer coverage of citrate capping ligands (…
We have discovered homologous series of iron pnictide superconductors (Fe2As2)[Can+1(Sc,Ti)nOy] (n=3,4,5). These compounds have extremely thick blocking layers up to quintuple perovskite layers sandwiched by the Fe2As2 layers. These samples exhibited bulk superconductivity with relatively high Tc up to 42 K. The relat…
Precision preparation: A facile, one-step, polyol protocol has been developed to prepare monodisperse, single-crystalline Au–Cu bimetallic nanocubes. Through the careful adjustment of the reaction parameters, both the dimensions of the nanocubes (two examples with edge lengths of 23 and 5 nm are shown) and their gold…
SERSly good! Crystallization of triangular gold nanoprisms into close-packed mono- and multilayers is facilitated by electrostatic repulsions. The ordering of the nanotriangles causes an order-of-magnitude increase in surface-enhanced Raman spectroscopy (SERS) enhancement relative to that of disordered assemblies.
Abstract The effectiveness and efficiency of an ethylene/acrylate copolymer in toughening semicrystalline and amorphous PLA through melt blending is studied. The mechanical properties, phase morphologies, miscibilities, and toughening mechanisms of the blends are assessed. The ethylene/acrylate impact modifier effecti…
Abstract A variety of measurements indicates that Au nanoparticle‐ catalyzed Sonogashira coupling of iodobenzene and phenylacetylene is predominantly a heterogeneous process. Large gold particles are much more selective than small ones, which is consistent with this view. Substantial leaching of Au into the solution p…