Materials Literature
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The residual n-type conductivity of O-polar hydrothermally grown ZnO single crystals and the role of annealing on the transport properties are assessed by temperature dependent Hall measurements on a wide 20–800 K temperature range. A deep level lying 250 meV below the conduction band is responsible for the residual n…
Concerns for the environmental and economic impact of organic solvents and detergents in gold nanoparticle (AuNP) solution synthesis have motivated the search for more environmentally benign alternatives. One approach is to synthesize AuNPs from tetrachloroauric(III) acid (HAuCl 4 ) using triblock copolymers (TBPs). H…
A novel strategy to graft functional groups at the surface of carbon nanotubes (CNTs) is discussed. Aiming at grafting nitrogen containing groups, and more specifically primary amine covalent functionalization, CNTs were exposed under atomic nitrogen flow arising from an Ar + N2 microwave plasma. The primary amine fun…
To understand the mechanism of bias-induced resistance switching observed in polypyrrole (PPy) based solid state junctions, in situ UV-vis absorption spectroscopy was employed to monitor oxidation states within PPy layers in solution and in PPy/metal oxide junctions. For PPy layers in acetonitrile, oxidation led prima…
In the relaxor ferroelectric Sr0.8Ba0.2Nb2O6 (SBN80) the relaxation of polar nanoregions (PNRs) reveals an anisotropic breathing mode when approaching the transition temperature, TC ≈ 289 K, on cooling. Two distinct dispersion steps and peaks, respectively, of the complex susceptibility components in the milli- and me…
Five new compounds based on the Waugh-type polyoxoanion [MnMo 9 O 32 ] 6– Na 4 Mn[MnMo 9 O 32 ]·11.5H 2 O ( 1 ), KNa 3 Mn[MnMo 9 O 32 ]·9H 2 O ( 2 ), Na 2 Ni 2 [MnMo 9 O 32 ]·12H 2 O ( 3 ), l -Mn 3 [MnMo 9 O 32 ]·13H 2 O ( 4a ), d -Mn 3 [MnMo 9 O 32 ]·13H 2 O ( 4b ), and l -Ni 3 [MnMo 9 O 32 ]·11.5H 2 O ( 5a ) have be…
Abstract A series of mono‐, di‐, tri‐, and tetra‐triphenylamine (TPA)‐substituted porphyrinatozinc complexes have been synthesized to investigate their spectral and electrochemical properties. The varied shapes of absorption spectra of porphyrin–triphenylamine (Por–TPA) conjugates in comparison with tetramesitylporphy…
The vortex states on optimally doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_{2}$As${}_{2}$ and underdoped Ba${}_{0.77}$K${}_{0.23}$Fe${}_{2}$As${}_{2}$ single crystals are imaged by magnetic force microscopy at various magnetic fields below 100$\phantom{\rule{0.28em}{0ex}}$Oe. Local triangular vortex clusters are observed in op…
We demonstrate here the tailoring of electro-optical properties of ferroelectric liquid crystals (FLCs) by doping different concentrations of Selenium Docosane (SD) capped palladium nanoparticles (PdNPs). The operating voltage is lowered by ∼50% in doped FLC as compared to undoped one. The remarkable increment in opti…
Dielectric, magnetic, and magnetodielectric properties of Y3Fe5−xTixO12+x/2 (x = 0, 0.1, 0.2) ceramics were investigated. Ti substitution induces a low temperature dielectric relaxation which comes from the charge carrier hopping between Ti3+ and Ti4+. The Maxwell-Wagner effect related dielectric relaxation becomes we…
The thermal conductivity $\ensuremath{\kappa}(T)$ of the fully ordered stable phase II, the metastable phase III, the orientationally disordered (plastic) phase I, as well as the nonergodic orientational glass (OG) phase, of the glass former cyclohexanol (C${}_{6}$H${}_{11}$OH) has been measured under equilibrium vapo…
The compressional and shear wave velocities of seven series of hydrous aluminosilicate glasses were measured by Brillouin scattering at room temperature and pressure as a function of water content. The glasses were quenched from high temperature and 0.2 or 0.3 GPa pressure. The dry end-members range from highly polyme…
The interfacial energy due to elastic micro-strains at the austenite–twinned martensite interface is calculated for the NiTi shape memory alloy undergoing cubic-to-monoclinic B2 ↔ B19' transformation. For each crystallographically distinct microstructure, an energetically favourable local shape of the interface is det…
The post-modification of polypentafluorostyrene via the selective substitution of the para- fluorine by amine-functionalized molecules represents a versatile method for the preparation of functional materials. This communication presents the extension of this synthetic approach towards metallosupramolecular materials.…
The local and average crystal structures and magnetic properties of the oxygen-deficient perovskite Sr(2)Fe(1.5)Cr(0.5)O(5+y) were studied using powder X-ray and neutron diffraction, neutron-pair distribution function analysis, and electron energy-loss spectroscopy. This material crystallizes in the cubic Pm3m space g…
The crystal structure of a 5C pyrrhotite from Silberberg Mine, Bodenmais, Germany, has been determined at 120 and 293 K in space group P2 1 . The low-temperature structure refined to R = 0.0261 for 5727 data with Io > 2σ(Io) and R = 0.0354 for all 7121 data. The room-temperature structure of the same crystal refine…
An effective method of fabricating vertically aligned silicon nanopillars (Si-NPs) was realized by using the self-assembled silver (Ag) nanodots as natural metal-nanomask during dry etching process. The obtained Si-NPs were preferentially aligned along the c-axis direction. Ultrathin ZnO films (~9 nm) were subsequentl…
Prediction of corrosion rate of steel structure in seawater is a challenging task for design and corrosion engineers for existing as well as new structures, due to wide variation of its composition across the global marine environment. The major parameters influencing the rate are salinity, sulphate, dissolved oxygen,…
The possibility of low-energy surface plasmon amplification by optically excited excitons in small-diameter single-wall carbon nanotubes is theoretically demonstrated. The nonradiative exciton-plasmon energy transfer causes the buildup of macroscopic population numbers of coherent localized surface plasmons associated…
An ultra-thin hexagonal microwave metamaterial absorber is described. It can absorb any polarized transverse electromagnetic wave because of its hexagonal shape. In spite of its very thin structure, almost 0.028λg, the absorber achieved 99% absorptivity at 11.35 GHz in experimental results because of the increased cou…