Materials Literature
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It is shown using a method based on a modified version of the mean field theory of Miklavic and Marcelja [J. Phys. Chem. 92, 6718 (1988)] that it should be possible for osmotic pressure due to the counterions associated with the two polyelectrolyte polymer brush coated surfaces to support a reasonable load (i.e., abou…
InAs nanowires have been actively explored as the channel material for high performance transistors owing to their high electron mobility and ease of ohmic metal contact formation. The catalytic growth of non-epitaxial InAs nanowires, however, has often relied on the use of Au colloids which is non-CMOS compatible. He…
Here we report the first-principle FLAPW-GGA calculations of the elastic properties of two related phases, namely, the ternary arsenide SrFe2As2 and the quaternary oxyarsenide LaOFeAs as the basic phases for the newly discovered "1111" and "122" 38-52K superconductors. The independent elastic constants (Cij), bulk mod…
We calculate the Overhauser frequency shifts in semiconductor nanostructures resulting from the hyperfine interaction between nonequilibrium electronic spins and nuclear spins. The frequency shifts depend on the electronic local density of states and spin polarization as well as the electronic and nuclear spin relaxat…
We study the dependence of the retrieval parameters, such as the electric permittivity, the magnetic permeability and the index of refraction, $n$, on the size of the unit cell of a periodic metamaterial. The convergence of the retrieved parameters on the number of the unit cells is also examined. We have concentrated…
Regular nanometer-scale patterning down to a few tens of nanometers and the manufacturing of diffractive optical elements in silk by using the ideas of soft lithography is reported. The unique processing of silk films makes them an ideal substrate to incorporate biological matter (such as small organics, enzymes, prot…
Nanoparticles on an atomic carpet: Individual graphene sheets have been decorated with metal nanoparticles through electrochemistry. The attachment of Pd particles onto graphene renders it sensitive to hydrogen. The controlled functionalization of graphene paves the way for various electronic applications.
A lithography-friendly self-assembly process which multiplies and rectifies an existing resist patterns is demonstrated here. A polymer film (right figure) has assembled at a 14 nm half-pitch on a thin resist pattern at twice the period (left figure). This directed self-assembly process dramatically heals defects and…
Graphene-oxide (GO) flakes have been deposited to bridge the gap between two epitaxial-graphene electrodes to produce all-graphene devices. Electrical measurements indicate the presence of Schottky barriers at the graphene/graphene-oxide junctions, as a consequence of the band gap in GO. The barrier height is found to…
Porous carbon/Co nanocomposites were fabricated by a sol-gel method. The electromagnetic parameters were measured in the 2–18GHz range. Compared with porous carbon composite, porous carbon/Co nanocomposite has larger dielectric loss due to the enhanced interfacial polarization relaxation loss and Ohmic loss. The maxim…
The development of carbon nanotube-(CNTs-)based gas sensors and sensor arrays has attracted intensive research interest in the last several years because of their potential for the selective and rapid detection of various gaseous species by novel nanostructures integrated in miniature and low-power consuming electroni…
An acellular xenogeneic scaffold derived from the bovine vocal fold lamina propria has shown some promise for in vitro vocal fold tissue engineering. To further explore the potential of the scaffold for cellular attachment, migration, and infiltration, as well as the transport of oxygen, proteins, and nutrients in viv…
The concept of low-voltage depletion and accumulation of electron charge in semiconductors, utilized in field-effect transistors (FETs), is one of the cornerstones of current information processing technologies. Spintronics which is based on manipulating the collective state of electron spins in a ferromagnet provides…
Density functional calculations are performed to investigate the room temperature ferromagnetism in GaN:Cu nanowires (NWs). Our results indicate that two Cu dopants are most stable when they are near each other. Compared to bulk GaN:Cu, we find that magnetization and ferromagnetism in Cu doped NWs is strongly enhanced…
Ramsey et al. [Nature Phys. 4, 277-281 (2008)] report the observation of quantum interference associated with tunnelling trajectories between states of different total spin length in a dimeric molecular nanomagnet. They argue that the interference is a consequence of the unique characteristics of a molecular Mn12 whee…
Fluoridcluster von Lanthanoiden werden durch Metathese von Ln(SePh)3 mit NH4F in organischen Lösungsmitteln erhalten. Die ersten Produkte dieser Reaktionen, [(py)24Ln28F68(SePh)16] (Ln=Pr, Nd; py=Pyridin; siehe Struktur), sind die größten diskreten Lanthanoidcluster, die bislang isoliert wurden. In Emissionsexperiment…
Ein Booster für die Singulettsauerstoffemission: Mithilfe speziell entwickelter Gold-Nanoscheiben kann einer der unwahrscheinlichsten natürlichen Übergänge – die Relaxation von Singulettsauerstoff unter Lichtemission – deutlich verstärkt werden. Der Grund hierfür sind Wechselwirkungen mit lokalisierten Oberflächenplas…
Abstract The catalytic activity of Ir/WO3/SiO2 for the selective reduction of NO with CO (CO-SCR) in the presence of excess O2 was significantly increased by the presence of coexisting H2O, whereas NO reduction hardly occurred in the absence of H2O. Coexisting H2O plays an important role preventing catalyst deactivati…
The present investigation reports on a simple technique for the preparation of single‐phase MnFe 2 O 4 nanocrystalline powders using the polymerized complex method, starting from manganese carbonate and iron nitrate. A mixed aqueous solution with citric acid, ethylene glycol, Fe, and Mn ions was polymerized. The phase…
The applicability of Rayleigh‐Gans and quasi‐continuum scattering models to β‐quartz solid solution (s.s.) glass–ceramics was studied. We evaluated the validity of these models using two specimens with different microstructures. The refractive indices of the crystalline and glass phases of the specimens were calculate…