Materials Literature
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We have elucidated the mechanism of CO oxidation catalyzed by gold nanoparticles through first-principle density-functional theory (DFT) calculations. Calculations on selected model show that the low-coordinated Au atoms of the Au(29) nanoparticle carry slightly negative charges, which enhance the O(2) binding energy…
We have demonstrated the covalent functionalization of 101̱0-ZnO surfaces with carboxylic acids by employing self-consistent charge density functional tight binding (SCC-DFTB) calculations. We have found two thermodynamically stable surface configurations: (i) a monolayer coverage with a bidentate chelating ligand and…
In this work, we report the near-infrared emission properties of Tm(3+)-Er(3+) codoped tellurite TeO(2)-WO(3)-PbO glasses under 794 nm excitation. A broad emission from 1350 to 1750 nm corresponding to the Tm(3+) and Er(3+) emissions is observed. The full width at half-maximum of this broadband increases with increasi…
Thin films of zinc phthalocyanine have been deposited on KBr and glass substrates by the thermal evaporation method and characterized by the x-ray diffraction, optical, infrared and Raman techniques. The observed x-ray diffraction and infrared absorption spectra of as-deposited thin films suggest the presence of an α…
In this paper, we present the design, fabrication, and characterization of wire grid polarizers. These polarizers show high extinction ratios and high transmission with structure dimensions that are compatible with current complementary metal-oxide-semiconductor (CMOS) technology. To design these wire grids, we first…
We present a new route to the synthesis of nitrogen doped single-walled nanotubes (CN x -SWNTs) based on laser vaporization technique. Using spatially resolved electron energy loss spectroscopy (SR-EELS), we measure the incorporation of nitrogen in SWNTs bundles as well as in individual tubes and investigate its atomi…
We have demonstrated for the first time an extremely facile procedure for the preparation of porous CuS nanotubes with good morphological and high chemical purity using [Cu(tu)]Cl·1/2H 2 O nanowire precursors as self-sacrificial templates at room temperature (thiourea = tu). Well-organized [Cu(tu)]Cl·1/2H 2 O nanowire…
Crystals of FeSe 0.88 and FeSeMn 0.1 have been grown from KCl solutions. Crystals measuring 2−3 mm across and 0.1−0.3 mm thick grow with a hexagonal plate like habit. Powder X-ray diffraction (XRD) measurements show strong peaks corresponding to the tetragonal α-FeSe phase and weak hexagonal β-FeSe peaks in both cases…
Perfluoroalkyl isocyanate-derived monolayers were prepared on oxidized aluminum surfaces by chemical vapor deposition (CVD) of 1H,1H,2H,2H-perfluorodecyl isocyanate (CF(3)[CF(2)](7)CH(2)CH(2)N horizontal lineC horizontal lineO, i.e., R(F)-NCO). Two types of oxidized aluminum substrates were studied: electrochemically…
External bulk video imaging (eBVI) of crystallization processes has proven to be a promising technique for metastable zone determination. In this contribution the endoscopy-based in situ bulk video imaging (iBVI) method is introduced. The video data are processed using the mean gray intensity method and by a digital i…
We report on the synthesis of superconducting single crystals of FeSe and their characterization by x-ray diffraction, magnetization and resistivity. We have performed ac susceptibility measurements under high pressure in a hydrostatic liquid argon medium up to 14 GPa and we find that T(C) increases up to 33-36 K in a…
A series of Ir and Au−Ir supported on TiO 2 catalysts were prepared by deposition−precipitation with urea to study the activity and stability of these materials in the CO oxidation reaction. Bimetallic samples were prepared using two approaches: one by codeposition of the metal precursors and the other by sequential d…
The cryo game: Heteroatom-embedded nanofunctional clusters are described that incorporate a [Te(VI)O(6)](6-) species contained within a {W(18)O(54)} cage. Not only does the tellurium-based species activate the {W(18)O(54)} cluster surface for assembly of larger nanoscale structures, such as [H(10)Te(VI) (2)W(58)O(198)…
Phase change materials in phase change random access memory (PRAM) undergo very high electrical stress as well as thermal stress during operation. These can cause intrinsic problems in stability of the PRAM devices. We investigate the stability of Ge2Sb2Te5, the most common phase change material for PRAM, under electr…
A systematic study of the electrochemical, spectroelectrochemical and electrochromic (EC) properties of poly(alkyl-3,4-ethylenedioxyselenophene) (PEDOS-C n ) ( n = 0, 2, 4, 6, 8 and 12) films is reported. The alkyl substituents lead PEDOS-C n films to exhibit sharper redox peaks than the parent PEDOS film and raise an…
Apatite-type lanthanum silicates of general formula La 9.33+2 x /3 (SiO 4 ) 6 O 2+ x have appeared recently as a new promising class of oxide ion conductors with potential applications as electrolytes for solid oxide fuel cells (SOFCs). They have been shown to demonstrate relatively high oxide ion conductivity at mode…
We report the direct measurement of a magnetoelectric (ME) exchange between magnetostrictive CoFe2O4 nanopillars in a piezoelectric BiFeO3 matrix for single-layer nanocomposite epitaxial thin films grown on (001) SrTiO3 substrates with SrRuO3 bottom electrodes. The ME coefficient was measured by a magnetic cantilever…
The electronic structures and the ferromagnetic (FM) stability in ${\text{In}}_{2}{\text{O}}_{3}:\text{Fe}$ (IFO) with additional Cu and oxygen vacancy $({V}_{\text{O}})$ doping have been investigated using first-principles calculations within the framework of density-functional theory. It is found that pure IFO has a…
The ultraviolet (UV) emission from the Au-coated ZnO films was greatly enhanced and the visible emission was significantly suppressed compared with the un-coated ZnO films. Great changes in photoluminescence of ZnO films are attributed to the electron transfer between conduction band and defect levels through the loca…
An, aus, an, aus …︁ Ein auf Pyren basierendes kovalentes organisches Gerüst (blau Pyren, weiß B, rot O) erleichtert die Excitonenwanderung und den Ladungstransport, sammelt Photonen des sichtbaren Lichts und reagiert rasch auf die Bestrahlung mit Licht unter Erzeugung eines merklichen Photostroms. Mit dem Gerüst ist e…