Materials Literature
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Abstract Owing to their promising applications in electronic and optoelectronic devices, conducting polymers have been continuously studied during the past few decades. Nevertheless, only limited progress had been made in conducting‐polymer‐based sensors until nanostructured conducting polymers were demonstrated for h…
Carbon lights up: A facile chemical method yields multicolor photoluminescent carbon dots derived from polymer/silica nanocomposites, which were prepared using surfactant-modified silica spheres as carriers and resols (phenol/formaldehyde resins) as carbon precursor (see picture). The surface-passivated carbon dots sh…
Abstract A capacitor of Pt/BaTiO 3 /CaRuO 3 (Pt/BTO/CRO) was successfully prepared on a Si substrate by using radio‐frequency (RF) magnetron sputtering. The preferentially (110)‐oriented CRO bottom electrode enabled us to obtain highly oriented BTO thin film on the Si substrate. Local epitaxy between BTO and CRO was c…
Photoluminescence of scintillator materials based on intrinsic excitonic luminescence (PbWO<sub>4</sub>), and on extrinsic luminescence from doped trivalent rare earth ions (RE<sup>3+</sup>), such as Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce <sup>3+</sup> and Lu<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Pr<sup>3+</su…
Optical nonlinearity or the nonlinear hyperpolarizability of amorphous materials (e.g., glasses) is related directly to the complex third-order susceptibility. The imaginary part of third-order susceptibility affects negatively the maximum data rate in telecommunication systems. In addition, many transition metals con…
Abstract Characteristics of homoepitaxial high‐quality nonpolar ZnO (11 $ \bar 2 $ 0) films and a useful measurement method for determining structures of those films are described. Homoepitaxial growth of high‐quality nonpolar ZnO (11 $ \bar 2 $ 0) films could be achieved by atmospheric‐pressure metal organic chemical…
We carried out the negative refractive index in the solid medium Er3+:YAlO3 crystal with a Λ-type four-level scheme proposed for atomic vapour by Thommen and Mandel, and Kastel (Phys. Rev. Lett. 2006 96 053601 and 2007 98 069301) based on quantum interference and electromagnetically induced transparency (EIT). The res…
Abstract Zn 1– x Mg x O (ZMO) thin films with x = 0, 0.1, 0.2, and 0.3 were prepared on Si(100) substrates by the sol–gel method. The influence of Mg content on the structural and the optical properties was studied by X‐ray diffraction and spectroscopic ellipsometry (SE) in the UV–visible region. The measured SE spect…
Alkali-metal-halide layers were constructed within Dion-Jacobson (DJ) layered perovskites by a two-step sequential intercalation method. Reductive intercalation with an alkali metal, followed by oxidative intercalation with chlorine gas, leads to the formation of the compounds, (A(2)Cl)LaNb(2)O(7) (A = Rb, Cs). Rietve…
An alkaline-developable, negative-working, photosensitive polybenzoxazole (PSPBO) based on poly( o -hydroxyamide) (PHA), a cross-linker 1,6-bis(vinyl sulfone)hexane (HBVS) having a flexible aliphatic chain, and N-{ [(4,5-methylenedioxy-2-α-methylnitrobenzyl)oxy]carbonyl}-2,6-dimethylpiperidine (MNCDP) as a novel photo…
Abstract Optically thick metallic nanohole structures were fabricated using two different methods – electron‐beam and nanosphere lithography. The nanosphere lithography technique was based on self‐assembling of polystyrene or silica nanospheres (0.560–1.25 μm in diameter) followed by the deposition of a silver film. T…
We present a facile access route to hydroxy-functional narrow disperse microspheres of well-defined grafting density (GD). Ethylene oxide has been grafted from highly crosslinked poly(divinyl benzene) microspheres by anionic ring-opening polymerization using sec-butyllithium as activator together with the phosphazene…
The smectic liquid crystal arrangements of binary mixtures of rod-like polymers, i.e., poly[ n -decyl-( S )-2-methylbutylsilane]s, with narrow molecular weight distributions, were investigated by synchrotron radiation small-angle X-ray scattering (SR-SAXS) and atomic force microscopy (AFM) analyses. Depending on the m…
Abstract Unique band structure peculiarities of graphene imply that near Fermi level electrons are described by two‐dimensional Dirac equation for massless particles. We investigate how these peculiarities manifest in electron–hole pairing and properties of indirect magnetoexcitons in two spatially separated, independ…
Abstract We present photoluminescence studies of silicon‐nanocrystal (Si‐NC) coated microcavities. The particular geometries studied are hollow fibers where there is a Si‐NC coating in the inner surface and regular optical fibers and glass microspheres where the coating is on the outside surface. The coatings were pre…
The all-electron full-potential linearized augmented plane-wave method has been used for an ab initio theoretical study of the band structure, the spectral features of the optical susceptibilities, the density of states, and the electron charge density for PbBiBO4. Our calculations show that the valence-band maximum (…
Blooms of the colonial green algae, Botryococcus braunii, have been widely known to exert toxic effects on a variety of aquatic organisms and have been noted to cause fish deaths in some environments. In this study, a monitoring of the abundance and distribution of B. braunii in Paoay Lake was done in 2006. Samples we…
The structure of thin films of poly(di- n -propylsiloxane), PDPS, was studied with a combination of optical and atomic force microscopy, electron diffraction, and grazing incidence X-ray diffraction. Two different morphological features are observed in the mesomorphic films. The lamellar ribbons are composed of the ch…
CdS nanoparticles of 4.5 nm diameter were synthesized in poly(2-vinylpyridine) micellar cores which were obtained by solvating a polystyrene-block-poly(2-vinylpyridine) block copolymer in polystyrene-selective toluene. Then, a C(60) -toluene solution was dispersed into the CdS micelle solution with stirring. This led…
A homogenization theorem is proved for energies which follow the geometry of an a-periodic Penrose tiling. The result is obtained by proving that the corresponding energy densities are <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msup> <mml:mi>W</mml:mi> <mml:mn>1</mml:mn> </mml:msu…