X-ray Photoemission Spectroscopy (x-ray + photoemission_spectroscopy)

Distribution by Scientific Domains


Selected Abstracts


Electrodeposition study of ODN:SWCNT hybrids on gold substrates

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 6 2008
Roya R. Lahiji
Abstract Sonication of short single-stranded DNA (oligodeoxyribonucleotide; ODN) with Single-Walled Carbon Nanotubes (SWCNTs) greatly facilitates the dispersion of SWCNTs from entangled ropes in an aqueous solution, creating ODN:SWCNT hybrids. Electrodeposition has been investigated to determine if well-dispersed ODN:SWCNT hybrids on a metal substrate can be created. Preliminary studies indicate that electrodeposition using an Au substrate held at +0.5 V produces ODN:SWCNT hybrids that are uniformly deposited across the Au substrate. This result can be compared to samples produced by drop casting and evaporation techniques which yield a thick tangled mat of ODN:SWCNT hybrids across the substrate. The resulting electrodeposited samples were characterized using Scanning Probe Microscope (SPM) and X-ray Photoemission Spectroscopy (XPS) techniques. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]


Lateral Inhomogeneity in the Electronic Structure of a Conjugated Poly(3-hexylthiophene) Thin Film

ADVANCED FUNCTIONAL MATERIALS, Issue 13 2010
Kaname Kanai
Abstract How annealing influences the morphology of a highly regioregular poly(3-hexylthiophene) (RR-P3HT) film at the substrate interface as well as the lateral inhomogeneity in the electronic structure of the film are elucidated. Whereas previous studies have reported that high-molecular-weight (MW) RR-P3HT films tend to show low crystallinity even after annealing, it is found that high-MW RR-P3HT does show high crystallinity after annealing at high temperature for a long time. Photoemission electron microscopy (PEEM), X-ray photoemission spectroscopy, and ultraviolet photoemission spectroscopy results clearly resolve a considerable lateral inhomogeneity in the morphology of RR-P3HT film, which results in a variation of the electronic structure depending on the local crystallinity. The PEEM results show how annealing facilitates crystal growth in a high-MW RR-P3HT film. [source]


Electronic and transport properties of Dy2Co7B3 compound

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 1 2003
A. Kowalczyk
Abstract New results of the electronic and transport properties (electrical resistivity) of Dy2Co7B3 compound are reported. This alloy crystallizes in the hexagonal Ce2Co7B3 type of structure. The electronic structure has been studied by the X-ray photoemission spectroscopy (XPS). The valence band of the XPS spectra is determined mainly by the Co(3d) and Dy(4f) bands. The peaks positions are in good agreement with binding energies of a metallic dysprosium and cobalt. The resistivity at low temperatures shows a T2 dependence. At higher temperatures the resistivity is no linear function of temperature, which indicates an electron-phonon interaction in the presence of a small s-d scattering. [source]


Soft X-ray photoemission spectroscopy of (LnO)CuS (Ln=Ce, Pr, Nd)

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 8 2006
H. Sato
Abstract Soft x-ray photoemission spectroscopy for layered oxysulfides (LnO)CuS (Ln = Ce, Pr, Nd) has been curried out in the Ln 3d-4f absorption region, to deduce the Ln 4f partial densities of states (DOSs). Only the Ce 4f DOS contributes to the valence-band maximum of (CeO)CuS, and on going from Ln = Ce to Pr, and to Nd, the 4f DOS shifts toward the deeper binding-energy side due to the lanthanide contraction. The Ce 3d photoemission spectrum of (CeO)CuS shows the mixing of Ce3+ and Ce4+ in the ground state. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]


Electronic structure of RCoxGe2 (R=Ce, Pr, Gd) compounds

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 1 2006
B. Penc
Abstract The electronic structure of the RCoxGe2 (R=Ce, Pr, Gd) compounds with the orthorhombic crystal structure of CeNiSi2 -type was studied by X-ray photoemission spectroscopy. The valence bands of CeCo0.86Ge2 and PrCo0.85Ge2 compounds have the similar character. Near the Fermi level the broad peak corresponding to the Co 3d and R 4f and 5d6s states is observed. In the case of GdCo0.64Ge2, the strong intensity peak at 8.7 eV corresponding to Gd 4f states is observed. The analysis of the XPS spectra of Ce and Pr 3d5/2 and 3d3/2 in the Gunnarson-Schönhammer model give the information on the hybridization of the f orbital with the conduction band. The hybridization energy equal 93 eV for R=Ce and 143 eV for R=Pr, respectively indicate stability of the shell in these compounds. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]


Soft X-ray photoemission spectroscopy of (LnO)CuS (Ln=Ce, Pr, Nd)

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 8 2006
H. Sato
Abstract Soft x-ray photoemission spectroscopy for layered oxysulfides (LnO)CuS (Ln = Ce, Pr, Nd) has been curried out in the Ln 3d-4f absorption region, to deduce the Ln 4f partial densities of states (DOSs). Only the Ce 4f DOS contributes to the valence-band maximum of (CeO)CuS, and on going from Ln = Ce to Pr, and to Nd, the 4f DOS shifts toward the deeper binding-energy side due to the lanthanide contraction. The Ce 3d photoemission spectrum of (CeO)CuS shows the mixing of Ce3+ and Ce4+ in the ground state. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]