Materials Literature
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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…
We have investigated the temperature-dependent changes in the near-${E}_{F}$ occupied and unoccupied states of ${\mathrm{Pr}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ which shows the presence of ferromagnetic and antiferromagnetic phases. The temperature-dependent changes in the charge and orbital degrees of free…
High-quality YTiO3 thin films were grown on LaAlO3 (110) substrates at low oxygen pressures (⩽10−8Torr) using pulsed laser deposition. The in-plane asymmetric atomic arrangements at the substrate surface allowed the authors to grow epitaxial YTiO3 thin films, which have an orthorhombic crystal structure with quite dif…
Even though quantum pumping is a very promising field, it has unfortunately not been unambiguously experimentally detected. The reason being that in the experiments the rectification effect overshadows the pumped current. One of the better known ways to detect it is by using the magnetic field symmetry properties of t…
In this article, a review of the existing high temperature shape memory alloy (HTSMA) systems is given. Certain crucial disadvantages general to all HTSMAs and related to structural mechanisms of the martensitic transformation (MT) taking place at elevated temperatures are described. The perspectives of the HTSMA's ap…
Krebs im Visier: Multifunktionelle magnetische Gold-Nanoschalen (Mag-GNS) entstehen beim Beschichten von Siliciumoxid-Kugeln mit Gold-Nanoschalen, in die Fe3O4-Nanopartikel eingelagert sind. Die Fe3O4-Nanopartikel ermöglichen eine kernspintomographische Diagnose (MRI) und die Gold-Nanoschalen eine photothermische Ther…