Materials Literature
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Leakage mechanisms of low-dielectric constant (low-k) carbon-doped silicon oxide (SiOC) were investigated in Cu damascene structure integrated with amorphous SiC or SiN as Cu diffusion barrier at low electric fields (0–1.36 MV/cm) and various temperatures (25–250 °C). Conduction mechanisms of SiOC integrated with SiC…
We report a systematic study of the transport properties of pulsed-laser-deposited NiMnSb films on silicon as a function of film thickness. A low-temperature upturn is observed in the resistivity for film thicknesses of 130 nm and below. The resistivity minimum corresponds to the maximum in the positive magnetoresista…
The magnetization vector distribution at a cleaved surface of La0.7Sr0.3MnO3 (001) crystal has been quantitatively analyzed by using a newly developed low-temperature spin-polarized scanning electron microscope. The magnetic structure essentially consists of two kinds of domains, where magnetizations are parallel or a…
Linear arrays of zinc meso -tetraarylporphyrin (ZnP), perylene-3,4-dicarboximide (PMI), and either naphthalene-1,8:4,5-bis(dicarboximide) (NI) or pyromellitimide (PI) were synthesized and studied by ultrafast transient absorption spectroscopy. PMI was covalently linked in one of two orientations relative to ZnP. In on…
Unintentionally doped bulk InP was prepared by the liquid encapsulated Czochralski method and subsequently implanted with various doses of Mn+. The properties of Mn+-implanted InP:Mn were investigated by various measurements. The results of energy dispersive x-ray peaks displayed injected concentrations of Mn of 0.8%…
A novel synthesis of asymmetric bis(chlorophthalimide)s (3,4-BCPIs) has been established. The polymerizations of them produced higher molecular weight (0.38−0.51 dL/g) polyimides containing biphenyl units than those of isomeric polymers derived from symmetric bis(chlorophthalimide)s (4,4‘-BCPIs) and 3,3‘-BCPIs. The di…
Temperature-dependent current–voltage (I–V), capacitance–voltage (C–V) measurements, and frequency-dependent C–V measurements have been carried out to investigate electrical properties of phosphorus (P)-doped n-type homoepitaxial diamond layers. We have fabricated lateral dot-and-plane (with ring-shaped-gap) Schottky…
The switching properties of dense BaTiO3 ceramics with 50 nm average grain size were investigated at local scale by piezoresponse force microscopy. Large areas with low piezoelectrical activity beside islands with strong piezoresponse were found. The application of electric fields induces stable domain structures and…
Center for Smart Light-Harvesting Materials and Department of Polymer Science & Engineering,Hannam University, 133 Ojung-dong, Daeduck-gu, Daejeon 306-791, KoreaReceived September 4, 2003Key Words : Coumarin-3-carboxylic acid, Luminescent lanthanide complexes, Photophysical properties,Planar waveguide amplifliers, Lig…
We report on the ferroelectric domain evolution as a function of the depth of the surface of 100 μm thick bulk Pb(Zr,Ti)O3 (PZT) doped with 2% Nb. Ferroelectric domain imaging (FDI) was performed by piezoelectric detection assisted by atomic force microscopy (AFM). The depth evolution of the polarization orientation w…
Abstract Diarylethene-capped gold nanoparticles were synthesized by a self-assembled monolayer (SAM) technique and the photochemical behavior was studied. The average diameter of the particles was determined to be 1.1 nm from TEM image. The synthesized nanoparticles showed reversible photochromic reactivity regardless…
The main goal of this spectroscopic study was to obtain relevant information about the symmetry properties for a thin film of a new class of photoaddressable azopolymers, which are known to display a huge birefringence (Δ n exceeding −0.45 at 632.8 nm) and a high stability and are attractive materials for rewritable r…
We report on photoluminescence (PL) properties of Cu- and Al-doped ZnS nanocrystals fabricated by sequential implantation of Zn+, S+, Cu+, and Al+ ions into Al2O3 matrices. The spatially resolved PL spectrum has been studied by a scanning near-field optical microscope (SNOM). In the SNOM image, bright spots are observ…
Crystalline silicon single quantum wells (QWs) were fabricated by high-temperature thermal oxidation of ELTRAN® (Epitaxial Layer TRANsfer) silicon-on-insulator (SOI) wafers. The Si layer thicknesses enclosed by thermal SiO2 range from 0.8 to 5 nm. Luminescence energies from such QWs vary from 1.77 to 1.35 eV depending…
In this study, V2O3 ultrathin films about 5–20 nm thick were prepared on Al2O3 (0001) substrates through a reactive evaporation process. Auger electron spectroscopy and x-ray photoelectron spectroscopy have been used in situ to characterize their compositions and chemical states. Electric resistance measurements show…
Abstract CdTe quantum dots (QDs, 3–6 nmφ) were incorporated into silica nanoparticles (20–30 nmφ) by an inverse microemulsion technique. The transmission electron microscope image shows that the QDs are situated on the surface of silica particles. These QD-silica particles in solution exhibited a stable luminescence w…
We present an accurate first-principles study of magnetism and energetics of single Mn impurities and Mn dimers in Si. Our results, in general agreement with available experiments, show that (i) Mn atoms tend to aggregate, the formation energy of dimers being lower than the sum of the separate constituents, (ii) ferro…
Abstract Gold nanorods (NRs) have two localized surface plasmon bands in the visible–near infrared region. We have succeeded in well-dispersed deposition and immobilization of the gold nanorods on the surface of a glass substrate by the electrostatic interactions. The outermost PDDA layer was effective to prevent the…
A novel Prussian-blue type ferrimagnet Na[MnCr(CN)(6)] has been prepared and characterized by single crystal X-ray analysis and magnetic measurements. The complex has a face-centered cubic lattice and shows ferrimagnetic ordering below 60 K.
Novel layer-rolled nanotubes of a nickel complex have been successfully synthesized by a simple wet chemical method. The nanotubes are assembled by rolling the (111) sheets of [Ni(NH3)6]Cl2 with the assistance of a polymer. The remarkable uniformity and high yields of the nickel complex nanotubes point to future appli…