Ex) Article Title, Author, Keywords
Abstract : In this paper, we investigate the effect of annealing gas compositions on the morphological evolution of heteroepitaxial silver island films grown on silicon substrates. We show that the presence of oxygen during thermal annealing leads to the formation of more isotropic silver islands with enhanced rates of dewetting and coarsening. This is explained by the results of morphology analysis and density functional theory calculation showing that a larger extent of oxygen adsorption under oxygen annealing ambient decreases the surface energy anisotropy of silver and the surface diffusion barrier of silver adatoms and clusters.
Abstract : (a) Synthesis of different sizes of hybrid MoS2 NDTs using hydrothermal method by the incorporation of KNa-tartrate as an intercalant. (b) Mechanism of the hybrid NDTs showing dissociation of intercalant into carbon nanodots and edges of MoS2 is broken into small sizes; resulting carbon and oxygen from intercalant bonded with the Mo species to produced hybrid structure of MoS2 nanodots. (c) Enhancement of magnitude and red shifting in photoluminescence spectra. (d) MoS2 NDTs solution (2.45nm average size) exhibits a blue fluorescence under the irradiation by a 365 nm UV light, further XPS reveals the Mo-C bond formation in hybrid NDTs.
Abstract : We have investigated the feasibility of the printed ITO films as a chemical sensor. ITO films were printed on a PET substrate by using an ITO (Sn ~10%) power which has an average particle size of 45nm. Superior chemical sensing performance of ITO films was observed in compared with the results of sputtered ITO film. It was discussed that the difference of grain size between the two samples led to a remarkable difference in the respective carrier scattering mechanisms and sensing performance.
Abstract : A Néel N-type ferrimagnet, SmMnO3, exhibits a striking magnetocapacitive effect around the compensation temperature. To clarify the origin of the magnetocapacitive effect, the magnetic states of the Sm 4f and the Mn 3d moments in SmMnO3 were investigated by means of X-ray magnetic circular dichroism (XMCD). The information on the Sm 4f and the Mn 3d magnetic states were obtained by using soft X-rays for the Sm M4,5 and the Mn L2,3 edges, respectively. Our soft XMCD data directly demonstrate that the magnetocapacitive effect of SmMnO3 is induced by simultaneous reversals of Sm 4f and Mn 3d angular momenta.
Abstract : (a) Schematic diagram of the fabrication setup for cascaded long-period fiber gratings (LPFGs) on polarization-maintaining photonic crystal fiber (PMPCF), (b) side-view image of the fabricated grating, and (c) its polarization-dependent in- fiber Mach-Zehnder interference spectra measured for orthogonal input polarization states denoted by polarizer angles of 0° (red) and 90
Abstract : We propose new pristine Si(111) surfaces with nearly flat and metallic property, based on first-principles calculations. The surfaces are composed of connected armchair ribbons, in which the constituent Si atoms are threefold (DB) or fourfold (DH) coordinated (Left panel). The calculated electronic structures show that the surfaces are metallic, as in topological insulators, in which the insulating bulk is surrounded by metallic surfaces (Right panel). Their unique structural and electronic properties are worthy of note to investigate and are expected to open a new realm of semiconductor materials if they are realized experimentally.
Abstract : Sm3+-doped BaMoO4 phosphor thin films were prepared by radio-frequency magnetron sputtering on sapphire substrates at several growth temperatures followed by rapid thermal annealing. A 1 inch-diameter BaMoO4 target doped with 5 mol% Sm2O3 was synthesized using solid-state reaction of BaCO3, MoO3, and Sm2O3 as starting materials. The highest red emission intensity of BaMoO4:Sm3+ phosphor thin film was achieved at a growth temperature of 400 °C, where the optical band gap was 4.70 eV and the color chromaticity coordinate was (0.492, 0.353). These results suggest that the BaMoO4:Sm3+ phosphor thin film is a promising candidate for application in red-light-emitting devices.
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