Materials Literature
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Laterally electrically-pumped Si light-emitting diodes (LEDs) based on truncated nanocrystalline-Si (nc-Si)/SiO2 quantum wells are fabricated with complementary-metal-semiconductor-oxide (CMOS) process. Visible electroluminescence (EL) can be observed under a reverse bias larger than ~6 V. The light emission would pro…
We present a study that identifies the ideal bandgap value in graphene devices, e.g., through size quantization in graphene nanoribbons (GNRs), to enable graphene-based high-performance RF applications. When considering a ballistic graphene GNR-LNA, including aspects like stability, gain, power dissipation, and load i…
Photoluminescence excitation and transmission spectra of Si nanocrystals of different diameters embedded in a SiO${}_{2}$ matrix have been investigated in the broad visible-vacuum ultraviolet spectral range using synchrotron radiation. The dependence of the photoluminescence excitation spectra on the nanocrystals size…
A conjugated polyelectrolyte with symmetrically assembled hydrophilic and hydrophobic side groups along the backbone has been successfully synthesized and demonstrated significant photophysical tunability with 65 nm of wavelength shift and 10-fold of intensity enhancement for the emission maximum, through solvent comp…
We compare the effectiveness of various known organometallic transesterification catalysts with a novel SnCl(2)·2H(2)O transesterification catalyst in the formation of homogeneous PC/PMMA blends with single T(g). It is shown that SnCl(2)·2H(2)O works more efficiently than the other organometallic transesterification c…
Abstract The local pH inside individual live glioma (U‐87 MG) cancer cells was monitored after treatment by the photodynamic therapy drug 6‐methyl‐1,3,8‐trihydroxyanthraquinone (emodin). The cellular pH is tracked by the real‐time measurement of the surface‐enhanced Raman scattering (SERS) from a probe that is embedde…
Using density-functional theory we analyze the thermodynamic stability of partially reduced, protonated, hydroxylated, and chlorinated ${\mathrm{V}}_{2}$O${}_{5}$(001) surfaces under flue gas conditions. These surfaces are characterized geometrically through surface relaxation calculations and electronically through c…
The intrinsic mechanism of graphitization occurring on the (111) surface of nanodiamonds (NDs) during the transformation from NDs into bucky diamonds are explored using density functional theory (DFT) computations in conjunction with density functional based tight-binding simulations. The DFT results indicate that dan…
We present a novel single-step fabrication approach, based on optical phase engineering, for tunable complex photonic chiral lattices of diverse geometries in a large area. By means of engineered reconfigurable phase patterns, we computationally simulate as well as experimentally investigate these complex structures.…
Rho/Ras signaling pathways may play an important role in the mechanism of LPS-induced inflammation and bronchoconstriction. In this study, we investigated the effect of LPS on the transmural contractile tension induced by electrical field stimulation (EFS) of human isolated bronchi. The possible contribution of Rho/Ra…
1 H and 11 B NMR measurements were performed to study BH 4 reorientations and diffusion in four samples of Mg(BH 4 ) 2 . These include the low (α) and high (β) temperature bulk solid phases, α-phase material with TiF 3 and ScCl 3 additives, and α-phase material incorporated into a carbon aerogel. All four samples show…
In this paper, we report on the tunable metal-enhanced fluorescence (MEF) of Ag nanostructures. Because of the good MEF properties of the highly dendritic Ag nanostructures, we obtained an increase of up to 25 times for the weak fluorescence of porphyrin molecules (Por⁴⁻). More importantly, by the introduction of a st…
The dissociation of H2O and formation of adsorbed hydroxyl groups on FeO particles grown on Au(111) were identified with in situ X-ray photoelectron spectroscopy (XPS) at water pressures ranging from 3 × 10(-8) to 0.1 Torr. The facile dissociation of H2O takes place at FeO particle edges, and it was successfully obser…
Abstract The 3D grain boundary character distribution (GBCD) of a sample subjected to equal channel angular pressing (ECAP) after eight passes and successive annealing at 650 °C for about 10 min is analyzed. The experiments are conducted using a dual beam system, which is a combination of a focused ion beam and a scan…
Two-dimensional dendritic growth due to solute precipitation was simulated using a phase-field model reported earlier [Z. Xu and P. Meakin, J. Chem. Phys. 129, 014705 (2008)]. It was shown that diffusion-limited precipitation due to the chemical reaction at the solid-liquid interface has similarities with diffusion-li…
Abstract The adsorption of aniline on a silver mirror was studied by surface‐enhanced Raman scattering (SERS) spectroscopy and density functional theory (DFT) calculation methods. The normal Raman and SERS spectra of pure aniline liquid and its solutions were recorded by a micro‐Raman spectrometer with excitation at 5…
We employed a solid-state combinatorial chemistry technique to screen 4 ternary phosphor systems: (Sr,Ca,Ba)(2)Si(5)N(8):Eu(2+), (Sr,Ca,Mg)(2)Si(5)N(8):Eu(2+), (Sr,Mg,Ba)(2)Si(5)N(8):Eu(2+), and (Ca,Ba,Mg)(2)Si(5)N(8):Eu(2+). The current pure nitride-based system did not allow for the use of conventional liquid soluti…
Substrate effect on the plasmon resonance of flat Ag particles is investigated experimentally, through the comparison between a system with particles on a substrate of amorphous carbon and a system with particles embedded in amorphous carbon. We demonstrate experimentally, in agreement with the theoretical predictions…
We report here on the structure of TiP 2 O 7 and electrical properties of nominally acceptor (Sc, Fe)‐doped TiP 2 O 7 synthesized by an aqueous phosphoric acid route. Structural characterization, including studies of the high‐temperature phase transition in TiP 2 O 7 , was carried out by powder X‐ray and neutron diffr…
We present a study of the Seebeck and Nernst coefficients of ${\mathrm{Fe}}_{1+y}{\mathrm{Te}}_{1\ensuremath{-}x}{\mathrm{Se}}_{x}$ extended up to 28 T. The large magnitude of the Seebeck coefficient in the optimally doped sample tracks a remarkably low normalized Fermi temperature, which like other correlated superco…