Materials Literature
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Nanostructured tungsten trioxide thin-film electrodes are prepared on conducting glass substrates by either potentiostatic electrodeposition from aqueous solutions of peroxotungstic acid or direct deposition of WO3 slurries. Once treated thermally in air at 450 degrees C, the electrodes are found to be composed of mon…
We show that knowledge of the phase behavior of a protein allows one to create a rational screen that increases the success rate of crystallizing challenging proteins. The strategy is based on using microfluidics to perform large numbers of protein solubility experiments across many different chemical conditions to id…
The control exerted by some invertebrates on the calcium carbonate polymorph produced is intriguing but not understood. Mytilus edulis shells, with the abrupt polymorph switch within their valves from an outer calcite to inner aragonite layer, are excellent examples of this phenomenon. Detailed crystallography of inta…
The authors have characterized field emission properties of freestanding, 1nm thick graphene layers, called carbon nanosheets (CNSs), which were grown perpendicular to the growth surface using a radio-frequency plasma-enhanced chemical vapor deposition technique. The CNSs are metallic impurity-free and have uniform he…
Vertically aligned ZnO nanorod arrays with rod lengths in the range of 200–1500nm were fabricated by a hydrothermal method. No stimulated emission was observed in as grown nanorods. Annealing of the rods in forming gas and oxygen significantly affected their optical properties and enabled the achievement of stimulated…
The elastic constants of ZnO nanostructures control their elastic energy and thereby are important to their function in converting strain energy to electricity. This letter presents the size dependence of Young’s moduli of ZnO nanoplates, according to density-functional-theory-based ab initio calculations. Our results…
Included in the meeting: The specific inclusion of adamantane by cyclodextrins is used to direct nanocrystals to self-assemble into macroscopic monolayers at the water/oil interface. The use of functionalized cyclodextrins allows stepwise interfacial self-assembly of different nanocrystals into macroscopic heterogeneo…
Thin films of 9.5% yttria-doped zirconia in the range of 17–210nm thickness were deposited on MgO (100) substrates by electron beam evaporation. The conductivity of the films was found to increase as the film thickness decreased. The films were found to be a mixture of both cubic and tetragonal phases. The impedance a…
Mn-doped Ga2O3 (7 cation % of Mn) thin film has been grown on c-cut sapphire substrate using pulsed-laser deposition technique. Electron diffraction analyses by transmission electron microscopy found that the Mn-doped film shows γ phase with spinel structure, which is different from undoped film showing β phase. No se…
The authors have synthesized epitaxial CoFe2O4 films on piezoelectric BaTiO3 single crystal substrates as a model magnetoelectric system. The BaTiO3 substrate provides a surface lattice that can be dynamically changed in an attempt to alter the strain state and hence the magnetization of the CoFe2O4 film. Magnetizatio…
Grain size effects on the dielectric properties of ${\mathrm{BaTiO}}_{3}$ nanoceramics have been studied by using the modified Ginsburg-Landau-Devonshire (GLD) thermodynamic theory. Considering the existence of internal stresses, it is found that with decreasing grain size the transition temperature of cubic-tetragona…
Room-temperature near-band-edge photoluminescence of ZnO is composed of contributions from free-exciton recombination and its longitudinal-optical phonon replica. By tracking the photoluminescence of ZnO nanowires from 4K up to room temperature, the authors show that the relative contributions of these emission lines…
The structural and magnetic properties of MnFe$_1 - x$Co$_ x$Ge compounds with$ x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.85, 0.9,$and$1.0$were investigated by means of X-ray diffraction (XRD) and magnetization measurements. XRD shows that the MnFe$_1 - x$Co$_ x$Ge compounds crystallize in the hexagonal Ni$_2$I…
Abstract A simple method for nano‐scale texturing of silicon surfaces based on local metal‐catalyzed wet chemical etching, which results in an almost complete suppression of reflectivity in a broad spectral range, has been successfully applied to produce black multi‐crystalline silicon solar cells. The performance of…
A simple, effective, and low-cost method is presented to fabricate an ordered Au particle array with hierarchical surface roughness on an indium tin oxide substrate based on an ordered alumina through-pore template, induced by solution dipping on colloidal monolayer, using an electrochemical deposition strategy. The a…
The photoluminescence spectra of As doped p-type ZnO thin films reveal neutral acceptor bound exciton of 3.3437eV and a transition between free electrons and acceptor levels of 3.2924eV. Calculated acceptor binding energy is about 0.1455eV. Thermal activation and doping mechanism of this film have been suggested by th…
The photo-induced electron and hole transfer across the semiconductor-dielectric interface in trap dominated p-type organic field-effect transistors (OFETs) has been investigated. It has been observed that the transfer of electrons into the dielectric results in a decrease of the field-effect mobility of polarons, sug…
Singles networks: The use of 1,3-propanediol and of 2-methyl-1,3-propanediol in manganese carboxylate chemistry leads to two new 3D coordination polymers with an unprecedented Mn19 repeating unit. The polymers have open framework structures with nanometer-sized cavities (see picture; Na not visible, Mn blue, O red, C…
AIM: To stimulate poly-beta-hydroxybutyrate (PHB) accumulation in Synechocystis sp. PCC 6803 by manipulating culture conditions. METHODS AND RESULTS: Stationary phase cultures of Synechocystis sp. PCC 6803 were subjected to N- and P-deficiency, chemoheterotrophy and limitations of gas-exchange. Enhanced PHB accumulati…
The dielectric properties of CaCu3Ti4O12 (CCTO) ceramics have been investigated in a temperature range of 143–573K and a frequency range of 1Hz–10MHz. A dielectric anomaly has been observed between 350 and 600K. The broad dielectric peaks in ε′(T) can be well fitted by a modified Curie-Weiss law and a Vogel-Fulcher re…