Materials Literature
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A crystalline CuInTe2 film is used as the channel layer in a thin-film field-effect transistor (see figure) yielding field-effect mobilities of over 10 cm2 V–1 s–1, which is approximately an order of magnitude better than previous results for spin-coated p-type systems. A novel three-component hydrazine-based solution…
Poly(alkoxyphenylenevinylene- b -isoprene) is used to study the phase transitions of a weakly segregated rod−coil block copolymer system. In the high coil fraction region of the phase diagram, phase transitions are caused by relatively small changes in temperature and composition. Several different sequences of phase…
Abstract The low‐cost, large‐scale fabrication of high‐density conducting‐polymer nanostructures is desirable for a variety of applications. We report the realization of high‐density conducting‐polymer nanostructures through a combination of nanoimprint lithography, a copolymer strategy, and a lift‐off process. Atomic…
Electrochemical surface-enhanced hyper-Raman scattering (SEHRS) and surface-enhanced Raman scattering (SERS) of centrosymmetric molecules on Ag film over nanosphere (AgFON) electrodes are presented. The SEHR spectra of trans-1,2-bis(4-pyridyl)ethylene (BPE) at different potentials (vs Ag/AgCl) are presented for the fi…
Two novel ligands containing pyridine units and phosphonate pendant arms, with ethane-1,2-diamine (L2) or cyclohexane-1,2-diamine (L3) backbones, have been synthesized for Ln complexation. The hydration numbers obtained from luminescence lifetime measurements in aqueous solutions of the Eu(III) and Tb(III) complexes a…
A polarization reorientation process has been studied by means of optical second-harmonic generation in an optically uniaxial smectic phase of an asymmetric bent-core liquid crystal. A nontilted polar smectic order with a biaxial order is induced by applying an electric field to the uniaxial nonpolar smectic phase. Th…
The controllable growth of a periodic hexagonal array of ZnO microrods and linear arrays of ZnO microtunnels has been demonstrated using hydrothermal synthesis and channel stamping. ZnO walls (see figure) are formed from a solution containing Zn(NO3)2·6 H2O at pH 10.9 for 24 h at 90 °C. The controlled growth of these…
High-contrast, thin-film polarizers based on dye-doped reactive liquid crystals (see figure) equal the polarization performance of conventional sheet polarizers at strongly reduced thicknesses. Advantageously, the guest–host polarizers can be patterned and applications are envisioned in liquid-crystal displays.
A semi-empirical relation which can be used to determine the total attenuation cross sections of samples containing H, C, N and O in the energy range 145 1332 keV has been derived based on the total attenuation cross sections of several sugars, amino acids and fatty acids. The cross sections have been measured by perf…
Liquid-crystal self-assembly is used to fabricate carbon nanoparticles specially suited for cell-delivery applications (see figure). The nanoparticles possess high-activity surfaces for easy functionalization and aqueous dispersion, and are shown to be rapidly internalized by mesothelial cells, wherein they show no me…
Sub-micrometer length copper fibers are obtained via polymer supported electrospinning and subsequent thermal treatment. The copper nature of the fibers is confirmed by using energy- dispersive X-ray analysis and wide- angle X-ray analysis (see figure). The copper fibers show metallic conductivity as confirmed by cond…
We investigate the dynamics of monodisperse colloidal polystyrene particles suspended in solutions of the semiflexible polymer filamentous actin, over a range of filament lengths that either exceed or are substantially less than the particle radius. The filament length is controlled by the capping protein gelsolin, an…
Comparable changes in the volume of RETe3 materials caused by temperature and RE size have opposite trends to the incommensurate charge density wave modulation. This is unique behavior among all reported charge density wave materials.
We demonstrate seedless synthesis of gold nanorods at high temperatures up to 97 degrees C. Using the correct silver nitrate concentration is crucial for formation of rod-shaped particles at all temperatures. We observed a decrease of nanorod length with increasing temperature, while the width stays constant throughou…
Designer jackets: Polydentate amino-functionalized poly(ethylene oxide)s with various block lengths are synthesized and used for ligand exchange and phase transfer of quantum dots and magnetic nanoparticles (see scheme; TEM images of the particles before and after the exchange are also shown). The ligands enable the t…
The enhanced local optical fields at the surface of illuminated metallic nanoparticles and nanostructures are of intense fundamental and technological interest. Here we report a self-consistent measurement of the spatial extent of the fringing field above a plasmonic nanoparticle surface. Bifunctional DNA-based adsorb…
Biogenic calcite obtained from different mollusk shells is subjected to heat treatments at elevated temperatures and structurally analyzed by high-resolution synchrotron X-ray powder diffraction. Remarkable broadening of diffraction peaks in samples annealed at temperatures above 200 °C is observed (see figure), indic…
We report the assembly of polyelectrolyte multilayer (PEM) films at the interfaces of thermotropic liquid crystal (LC) droplets dispersed in an aqueous phase. Exposure of PEM-coated droplets to surfactant slowed the bipolar-to-radial ordering transition of the LCs by 2 orders of magnitude relative to naked droplets. T…
The aqueous synthesis of thiol-stabilized semiconductor CdTe colloidal nanocrystals has been revisited. We found optimal conditions for the synthesis of high-quality CdTe NCs through a study of the influence of the initial conditions (structure and concentration of Cd-thiol complexes) on the quality of the CdTe nanocr…
A new procedure aimed at folding a two-dimensional powder diffraction pattern into a one-dimensional scan is presented. The sample-to-detector distance is the only parameter that, in this approach, needs to be adjusted in a separate step by using the `standard' sample. The technique consists of three steps: tracking t…