Materials Literature
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We propose an accurate description for the dispersion of gold in the range of 1.24--2.48 eV. We implement this improved model in an FDTD algorithm and evaluate its efficiency by comparison with an analytical method. Extinction spectra of gold nanoparticle arrays are then calculated.
Photocatalytic properties of Ag@TiO2 composite clusters have been investigated using steady state and laser pulse excitations. Photoexcitation of TiO2 shell results in accumulation of the electrons in the Ag core as evidenced from the shift in the surface plasmon band from 460 to 420 nm. The stored electrons are disch…
Enhancement of ultraviolet (UV) photoresponsivity in chemical-vapor-deposited (CVD) diamond photodetectors was observed by posttreatment in a plasma of oxygen and carbon tetrafluoride at room temperature. This room-temperature plasma posttreatment was found to be an efficient process in suppressing the extrinsic photo…
Abstract Transport properties of manganese‐doped InSb crystals with hole concentration close to the critical concentration N cr of the metal–insulator transition (MIT) in p‐InSb(Mn) was found to be different from MIT in semiconductors doped with non‐magnetic impurities such as p‐Ge(Ga), p‐Si(P) and p‐InSb(Ge). On the…
Abstract Surface-alkylated poly(propylene imine) dendrimer was treated with methyl iodide to afford quaternarized ammonium iodide dendrimer. The quaternarized dendrimer catalyzed the Mukaiyama–Aldol reaction of trimethylsilyl acetal with various aldehydes as a Lewis base in apolar toluene solvent.
We present a two terminal HSpice model for chalcogenide based phase change memory (CRAM) element. By including physical models of CRAM programming, this model can simulate not only the resistance change by different electrical pulses, but also temperature profile and crystalline fraction during the operation. Furtherm…
Abstract Porous nickel oxide (NiO) nanofibers, structured with and composed of linearly oriented NiO nanoparticles, were synthesized via a simple method using a solution containing ethanol, H2O, NiCl2, and P123 (Pluronic P123, a triblock copolymer H(OCH2CH2)20(OCH(CH3)CH2)70(OCH2)20OH). By adjusting the concentration…
We introduce a phase field model which permits the study of the morphological evolution of second phase particles coherently precipitated from the mother phase in elastically stressed alloys. The model has three field variables: the concentration of solute atoms, the displacement field, and the phase field. These fiel…
Two different cellulosic substrates in the form of powders and regenerated fibers were surface modified with different isocyanates in a heterogeneous organic medium. Two of these isocyanates also bore alkenyl functions which were used as a means of copolymerization in subsequent reactions involving common monomers. Th…
Two new thorium chalcophosphates have been synthesized by the reactive flux method and characterized by single-crystal X-ray diffraction, diffuse reflectance, and Raman spectroscopy: Cs4Th2P6S18 (I); Rb7Th2P6Se21 (II). Compound I crystallizes as colorless blocks in the triclinic space group P1 (No. 2) with a = 12.303(…
The hydrogen sorption capacity of arc-synthesized single-walled carbon nanotubes (SWNTs) was studied using a specially built high-pressure rig coupled to a Toepler pump capable of directly measuring the desorbed volumes of gas. The samples studied were prepared using the arc-evaporation method and were as-produced SWN…
The C amount and the structure of the $\mathrm{S}\mathrm{i}(001)\mathrm{\text{\ensuremath{-}}}c(4\ifmmode\times\else\texttimes\fi{}4)$ surface is studied using scanning tunneling microscopy (STM) and ab initio calculations. The $c(4\ifmmode\times\else\texttimes\fi{}4)$ phase is found to contain $1/8$ monolayer C (1 C…
Synthesis of multi-walled carbon nanotubes in high yield using Mm based AB2 alloy hydride catalysts and the effect of purification on their hydrogen adsorption properties, Shaijumon, M M, Rajalakshmi, N, Ryu, Hojin, Ramaprabhu, S
We present a novel route to prepare pH-dependent nanostructures from highly ordered thin films of poly(styrene)- block -poly(2-vinylpyridine)- block -poly( tert -butyl methacrylate) triblock terpolymers. Using a polymer-analogous reaction, we modify the chemical nature of the block components without altering the over…
We investigate ambipolar to unipolar transition by the effect of ambient air on the carbon nanotube field-effect transistor. A unipolar transport property of the double-walled nanotube field-effect transistor and its conversion from ambipolar behavior are observed. We suggest that adsorptions of oxygen molecules, whos…
The geometrical and chemical structure of the $\mathrm{CoAl}(111)$ surface is investigated by quantitative low-energy electron diffraction and calculations applying density functional theory. The stacking sequence of the top four atomic planes is $\mathrm{Al}\text{\ensuremath{-}}\mathrm{Co}\text{\ensuremath{-}}\mathrm…
Quantitative convergent-beam electron diffraction (QCBED) experiments allow absolute scale measurements of low-order structure factors with very high accuracy. In this paper, eight low-order structure factors for copper measured by QCBED have been combined with the higher-order gamma-ray structure factors in order to…
Large fullerenes and carbon-coated metal nanoparticles that are formed during the synthesis of carbon nanotubes have been functionalized by the addition of alkyl radicals and isolated by extraction into chloroform. The soluble, functionalized fullerenes have been isolated from raw single-wall carbon nanotube (SWNT) ma…
A novel one-pot procedure starting from the corresponding M(acac)3 x nH2O, metal-free phthalocyanine H2Pc', and naphthalonitrile in the presence of DBU in n-octanol has been developed to prepare heteroleptic (naphthalocyaninato)(phthalocyaninato) rare earth double-decker complexes. A series of six sandwich compounds w…
The interaction of Zn-polar and O-polar ZnO surfaces with atomic hydrogen produced by a remote rf plasma source is investigated in situ and in real time using spectroscopic ellipsometry. It is found that the reactivity of ZnO with atomic hydrogen depends on polarity. The interaction of O-polar surfaces with atomic hyd…