Materials Literature
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Glasses of the x Gd 2 O 3 · (100-x)[4 Bi 2 O 3 · GeO 2 ] system, with 1 ≤ x ≤ 30 mol% were obtained and investigated by electron paramagnetic resonance (EPR) and magnetic susceptibility measurements. The EPR spectra of the studied glasses reveal resonance sites with an unexpected high crystalline field in addition to…
Variable temperature electron beam induced current technique was employed for the profiling of ZnO p-n homojunctions and the extraction of minority electron diffusion length values in the Sb-doped p-type ZnO region. A thermally induced increase for diffusion length of minority electrons was determined to have an activ…
Sensors based on the giant magnetoimpedance (GMI) effect in silicon steelswere constructed. Strips of silicon steels (0.500 mm-thick, 35.0 mm-long) with widthsranging from 0.122 to 1.064 mm were cut from recycled transformer cores. Since amaximum GMI ratio of 300% and a maximum field sensitivity of 1.5%/Oe were observ…
We demonstrate the directional growth of Ge on a GaAs {100} wafer at 175°C using radio-frequency plasma-enhanced chemical vapor deposition at 13.56MHz under conditions where nanocrystals are the primary contributors to film growth. High resolution transmission electron microscopy (HRTEM) verifies the transport of plas…
Abstract The synthesis of the unsymmetrical triarylmethine dyes 4 derived from a lithiated naphthopyran and diaryl ketones is reported. In toluene solution 4 display a typical reversible photochromic response becoming coloured upon irradiation with UV light and fading upon cessation of irradiation. At low pH an intens…
Abstract A series of compatibilizers, including polypropylene (PP) grafted with 2‐tertbutyl‐6‐(3‐tertbutyl‐ 2‐hydroxy‐5‐methylbenzyl)‐4‐methylphenyl acrylic ester (BPA), glycidyl methacrylate (GMA), GMA/styrene (GMA‐st), and 2‐allyl bisphenol A (2A) were investigated for the purpose of improving the compatibility of P…
Photoluminescence lifetime measurements of the erbium decay in samples of erbium(III) bis(perfluoro-p-tolyl)phosphinate, Er[(p-CF3C6F4)2PO2]3, as a function of erbium concentration have been made. It has been found that for concentrations greater than 50%, the lifetime could be fitted with a stretched exponential func…
We present a simple method to record subwavelength gratings (SWGs) in an azobenzene (AZ)-containing liquid-crystalline polymer by preirradiation. Since the cooperative motions of mesogens are eliminated in a cis-AZ-rich isotropic phase by the pretreatment, the subwavelength modulation of surface relief and refractive…
This paper presents a new carbon nanotube transistor (CNT) modelling technique which is based on an efficient numerical piece-wise non-linear approximation of the non-equilibrium mobile charge density. The technique facilitates the solution of the self-consistent voltage equation in a carbon nanotube such that the CNT…
The experimentally observed high surface conductivity of hydrogenated diamond films is explained through ab initio results as well as model calculations based on the tight-binding molecular dynamics method. Our results support the previously reported experimental results indicating that the surface conductivity of the…
An infrared microfocus spectroscopic mapping ellipsometer was set up at the Berlin electron synchrotron storage ring and used to study ultrathin polyacrylic acid brush films with 3nm thickness. The pH-responsive properties of the brush on a gold-coated glass substrate were investigated. The chemical structure of the b…
The design of many novel electronic devices will hinge on our understanding of the joining of certain nanostructures. In particular, the perpendicular joining of a carbon nanotube to a flat graphene sheet applies to the situation of connecting to an electronic platform. Connecting carbon nanostructures essentially inv…
We perform molecular dynamics simulations to investigate the diffusive motion of TIP5P (the transferable intermolecular potential with five points) water in the direction perpendicular to the two hydrophobic confining walls. To calculate the diffusion constant, we use the concept of the characteristic residence time w…
Abstract A new molecular thermodynamic model to predict the dependency of the glass transition temperature ( T g ) of polymer on its molecular weight was developed based on the configurational entropy model and the Flory–Huggins theory. In this model, the disorientation entropy of the polymer ( S dis ) has been taken…
We demonstrated a prototype of nanoelectromechanical switch which was fabricated with single-walled carbon nanotubes (SWCNTs). An alternating current electric field was utilized to assemble interconnected SWCNTs suspended over the focused ion beam lithography fabricated trenches on the electrode surface. By controllin…
Magnetic permeability of a composite is investigated using three-dimensional numerical models for static and quasistatic case. To analyze the effect of agglomeration and imaginary part of intrinsic permeability on the effective permeability, inclusions with complex permeability and having random distribution or random…
Bestrahlung von Vesikeln: Die Umwandlung von Vesikeln in eine Fasernanostruktur gelingt durch Photolyse und Reorganisation einer dendritischen Baueinheit mit 2-Nitrobenzylgruppe (siehe Bild). Supramolekulare Aggregate aus einem Amiddendron mit photochemisch isomerisierbarer Azobenzoleinheit setzen eingeschlossene Mole…
We observe room temperature (RT) visible and infrared (IR) photoluminescence (PL) bands peaked around 680 and 1020nm, respectively, from a silicon (Si) surface amorphized and patterned with ripples by 60keV Ar+ bombardment at 60° angle of ion incidence. However, the Si surface amorphized but not patterned under normal…
Thin Ga0.94Mn0.06As layers have been grown by low temperature molecular beam epitaxy on (110) GaAs substrates and on [110] and [−110] oriented GaAs cleaved edges. The Curie temperatures TC for the as-grown samples ranges from 46to80K. After annealing at low temperatures TC increases up to 115K. In addition, magnetic a…
Abstract Synthesis of high temperature polyimide foams with pore sizes in the nanometer range was developed. Foams were prepared by casting graft copolymers comprising a thermally stable block as the matrix and a thermally labile material as the dispersed phase. The copolyimides as the matrix material were prepared vi…