Materials Literature
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To examine the correlation between the atomic displacement parameters of oxygen atom and oxide-ion conductivity of rare-earth-oxide-doped ceria materials, Ce 0.8 R 0.2 O 1.9 (R = La, Nd, Sm, Gd, Y, and Yb), their crystal structures have been refined by the Rietveld analyses of high-resolution ( d > 0.38 Å) synchrotron…
Gold service: The asperities on a polished gold surface are quickly dissolved by the OH. radicals of Fenton's reagent. The dissolution of Au is rapid at the beginning of the reaction and is negligible when the asperities have been dissolved. Although the OH. radicals also oxidize the smooth parts of the Au surface, th…
The authors report on the photocurrent gain in a diamond photodetector that has two nonohmic contacts connected back-to-back. This photocurrent gain strongly depends on both the deep-ultraviolet (DUV) light intensity and the applied voltage. In addition, the gain is accompanied by a slow response. The gain is observed…
The synthesis and characterization of carbon-coated ferromagnetic nanoparticles that organize into 1-D assemblies of micrometer-sized ferromagnetic chains is described. A controlled aromatization and carbonization of glucose under hydrothermal reaction conditions enabled the preparation of carbonaceous surfactants tha…
Cobalt hydroxycarbonate nanorods are prepared by precipitation of cobalt acetate with sodium carbonate in ethylene glycol. Structural and chemical analyses of the intermediate phases during the precipitation and aging process revealed that amorphous cobalt hydroxide acetate is formed at the initial stage where ethylen…
The phonon-scattering cross section associated with isotopic clusters is evaluated from first principles and used to estimate the reduction in thermal conductance of wide graphene samples. A strong sensitivity of the thermal conductivity toward clustering is predicted for micrometer-sized samples at low temperatures.…
Small-angle neutron scattering (SANS) experiments were carried out to investigate the structure of aqueous (D(2)O) G4 PAMAM dendrimer solutions as a function of molecular protonation and dendrimer concentration. Our results indicate unambiguously that, although the radius of gyration R(G) remains nearly invariant, the…
CoMoCat single-walled carbon nanotubes (SWNTs) treated with diazonium salts can be used to fabricate solution-processable field-effect transistors (FETs) with a full semiconductor device yield. By increasing the network thickness, the effective mobility of the devices can be raised to ∼10 cm2 V−1 s−1 while keeping the…
We report the discovery of a new smectic-${C}^{*}$ liquid-crystal phase with six-layer periodicity by resonant x-ray diffraction. Upon cooling, the new phase appears between the $\mathrm{Sm}{C}_{\ensuremath{\alpha}}^{*}$ phase having a helical structure and the $\mathrm{Sm}{C}_{d4}^{*}$ phase with four-layer periodici…
Abstract We deposited ZnO thin films by atomic layer deposition (ALD) and then investigated the chemical and electrical characteristics after plasma treatment. The chemical bonding states were examined by X‐ray photoelectron spectroscopy (XPS). The XPS spectra of O 1s showed that the intensity of oxygen deficient regi…
We report measurements of quasiparticle relaxation dynamics in the high-temperature superconductor $(\mathrm{Ba},\mathrm{K}){\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ in optimally doped, underdoped, and undoped regimes. In the underdoped sample, spin-density wave (SDW) order forms at $\ensuremath{\sim}85\text{ }\text{ }\math…
Quantum dots (QDs) are loaded with a series of peptides and proteins of increasing size, including a <20 residue peptide, myoglobin, mCherry, and maltose binding protein, which together cover a range of masses from <2.2 to approximately 44 kDa. Conjugation to the surface of dihydrolipoic acid-functionalized QDs is fac…
A new type of heterogenized organometallic catalysts, periodic mesoporous organometallic silicas with organometals and organic groups embedded in silica walls have been developed using surfactant-directed co-condensation. These catalysts exhibit high efficiencies and strong durability in water-medium organic reactions…
We propose a simple analytical model of a metal-oxide-semiconductor field-effect transistor with a lateral resonant gate based on the coupled electromechanical equations, which are self-consistently solved in time. All charge densities according to the mechanical oscillations are evaluated. The only input parameters a…
We develop an all-electron quantum Monte Carlo (QMC) method for solids that does not rely on pseudopotentials, and use it to construct a primary ultra-high pressure calibration based the equation of state of cubic boron nitride(c-BN). We compute the static contribution to the free energy with QMC, and obtain the phono…
Although optical metamaterials that show artificial magnetism are mesoscopic systems, they are frequently described in terms of effective material parameters. But due to intrinsic nonlocal (or spatially dispersive) effects it may be anticipated that this approach is usually only a crude approximation and is physically…
An ultrasensitive SPR-detection of the explosive hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) is achieved by composites of Kemp's acid molecularly imprinted Au nanoparticles crosslinked by bisaniline units on a Au surface (see figure).
We report on systematic ab-initio investigations of Co and Cr interlayers embedded in Fe(001)/MgO/Fe(001) magnetic tunnel junctions, focusing on the changes of the electronic structure and the transport properties with interlayer thickness. The results of spin-dependent ballistic transport calculations reveal options…
We derive analytical solutions for the zero-energy states of degenerate shell obtained as a singular eigenvalue problem found in tight-binding (TB) Hamiltonian of triangular graphene quantum dots with zigzag edges. These analytical solutions are in agreement with previous TB and density-functional theory results for s…
We explore the possibilities of current modulation at nano-scale level using mesoscopic rings. A single mesoscopic ring or an array of such rings is used for current modulation where each ring is threaded by a time varying magnetic flux $ϕ$ which plays the central role in the modulation action. Within a tight-binding…