The Electronic Structures of Fullerene/Transition-Metal Hybrid Material

2008 ◽  
Vol 1081 ◽  
Author(s):  
Yoshihiro Matsumoto ◽  
Seiji Sakai ◽  
Hiroshi Naramoto ◽  
Norie Hirao ◽  
Yuji Baba ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
Line Broadening ◽  
Hybrid Films ◽  
Xps Spectra ◽  
X Ray ◽  
Nexafs Spectroscopy ◽  
Homo Level ◽  
Valence Band Region ◽  
X Ray Absorption

ABSTRACTLocal electronic structures of C60-Co hybrid films have been studied by X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. XPS spectra of C 1s main and satellite peaks for the C60-Co films show binding-energy shifts and also line-broadening compared to those in a pure C60 film. In addition, XPS spectra in valence band region suggest an appearance of three new components at near Fermi level and HOMO level in the C60-Co film. These results are attributed to hybridizations between Co 3d band and C60 LUMO. The same effects have been observed in NEAXFS spectra at C 1s excitations.

The Control of Electronic States Spreading Outside the Conjugated Polymer Surface

2006 ◽  
Vol 965 ◽  
Author(s):  
Xiao Tao Hao ◽  
Takuya Hosokai ◽  
Noritaka Mitsuo ◽  
Satoshi Kera ◽  
Kazuyuki Sakamoto ◽  
...  
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
Conjugated Polymer ◽  
Polymer Surface ◽  
Electronic States ◽  
Penning Ionization ◽  
X Ray ◽  
Molecular Ordering ◽  
X Ray Absorption

ABSTRACTThe surface electronic structures of conjugated regio regular and regio random poly (3- hexylthiophene) (rr-P3HT and rra-P3HT) thin films were studied by near edge X-ray absorption fine structure spectroscopy, ultraviolet photoelectron spectroscopy and Penning ionization electron spectroscopy (PIES). The distribution of the surface electronic states was controlled on rr-P3HT and rra-P3HT thin films with different molecular ordering by varying the coating process and PIES was adopted to observe the electronic states existing outside the surface.

scholarly journals Photolysis of Fluorinated Graphites with Embedded Acetonitrile Using a White-Beam Synchrotron Radiation

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 231
Author(s):  
Galina I. Semushkina ◽  
Yuliya V. Fedoseeva ◽  
Anna A. Makarova ◽  
Dmitry A. Smirnov ◽  
Igor P. Asanov ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Photon Irradiation ◽  
Nexafs Spectroscopy ◽  
White Beam ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
X Ray Absorption

Fluorinated graphitic layers with good mechanical and chemical stability, polar C–F bonds, and tunable bandgap are attractive for a variety of applications. In this work, we investigated the photolysis of fluorinated graphites with interlayer embedded acetonitrile, which is the simplest representative of the acetonitrile-containing photosensitizing family. The samples were continuously illuminated in situ with high-brightness non-monochromatized synchrotron radiation. Changes in the compositions of the samples were monitored using X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The NEXAFS N K-edge spectra showed that acetonitrile dissociates to form HCN and N2 molecules after exposure to the white beam for 2 s, and the latter molecules completely disappear after exposure for 200 s. The original composition of fluorinated matrices CF0.3 and CF0.5 is changed to CF0.10 and GF0.17, respectively. The highly fluorinated layers lose fluorine atoms together with carbon neighbors, creating atomic vacancies. The edges of vacancies are terminated with the nitrogen atoms and form pyridinic and pyrrolic units. Our in situ studies show that the photolysis products of acetonitrile depend on the photon irradiation duration and composition of the initial CFx matrix. The obtained results evaluate the radiation damage of the acetonitrile-intercalated fluorinated graphites and the opportunities to synthesize nitrogen-doped graphene materials.

Crystalline Phases and Electronic Structures in Superconducting Bi – Sr – Ca – Cu Oxides

1997 ◽  
Vol 12 (8) ◽  
pp. 2009-2013
Author(s):  
M. D. Giardina ◽  
R. Feduzi ◽  
D. Inzaghi ◽  
A. Manara ◽  
C. Giori ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
Theoretical Interpretation ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
Edge Structure ◽  
X Ray ◽  
Quantum Percolation ◽  
X Ray Absorption

Two classes of samples, designated A and B, of layered Bi–Sr–Ca–Cu oxides having the same nominal composition 4 : 3 : 3 : 4, but different thermal histories, were investigated by using field modulated microwave absorption (ESR), powder x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and x-ray absorption near the edge structure (XANES). Previous electrical resistivity measurements showed that the B samples presented only two superconducting phases with midpoints of the transition temperatures at ∼80 K and ∼105 K. The microwave absorption technique indicated instead the presence of islands which became superconducting at the above-mentioned temperatures also in the A samples. The crystalline and electronic structures of the two types of samples are illustrated and discussed. A plausible theoretical interpretation of the experimental results, based on a quantum percolation model with Coulomb interaction, is also given.

Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass

2016 ◽  
Vol 23 (6) ◽  
pp. 1424-1432 ◽  
Author(s):  
V. N. Rai ◽  
Parasmani Rajput ◽  
S. N. Jha ◽  
D. Bhattacharyya ◽  
B. N. Raja Shekhar ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Photoelectron Spectroscopy ◽  
Glass Matrix ◽  
Structural Changes ◽  
Phosphate Glasses ◽  
White Line ◽  
Edge Structure ◽  
Xps Spectra ◽  
X Ray ◽  
X Ray Absorption

X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) of Nd-doped phosphate glasses have been studied before and after gamma irradiation. The intensity and the location of the white line peak of theL3-edge XANES of Nd are found to be dependent on the ratio O/Nd in the glass matrix. Gamma irradiation changes the elemental concentration of atoms in the glass matrix, which affects the peak intensity of the white line due to changes in the covalence of the chemical bonds with Nd atoms in the glass (structural changes). Sharpening of the Nd 3d5/2peak profile in XPS spectra indicates a deficiency of oxygen in the glasses after gamma irradiation, which is supported by energy-dispersive X-ray spectroscopy measurements. The ratio of non-bridging oxygen to total oxygen in the glass after gamma radiation has been found to be correlated to the concentration of defects in the glass samples, which are responsible for its radiation resistance as well as for its coloration.

Cyclic dipeptide immobilization on Au(111) and Cu(110) surfaces

2014 ◽  
Vol 16 (14) ◽  
pp. 6657-6665 ◽  
Author(s):  
Oksana Plekan ◽  
Vitaliy Feyer ◽  
Sylwia Ptasińska ◽  
Nataliya Tsud ◽  
Kevin C. Prince
Keyword(s):  
Fine Structure ◽  
Photoelectron Spectroscopy ◽  
Adsorption Properties ◽  
Cyclic Dipeptide ◽  
Cyclic Dipeptides ◽  
X Ray ◽  
Absorption Fine ◽  
Nexafs Spectroscopy ◽  
X Ray Absorption

Soft X-ray Photoelectron Spectroscopy (XPS) and Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy have been used to probe the electronic and adsorption properties of two cyclic dipeptides, i.e. cyclo(glycyl-histidyl) and cyclo(phenylalanyl-prolyl), on Au(111) and Cu(110) surfaces.

scholarly journals The Identification of Cu–O–C Bond in Cu/MWCNTs Hybrid Nanocomposite by XPS and NEXAFS Spectroscopy

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2993
Author(s):  
Danil V. Sivkov ◽  
Olga V. Petrova ◽  
Sergey V. Nekipelov ◽  
Alexander S. Vinogradov ◽  
Roman N. Skandakov ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Photoelectron Spectroscopy ◽  
Charge Compensation ◽  
X Ray ◽  
Nexafs Spectroscopy ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Complementary Set ◽  
Walled Carbon Nanotubes ◽  
X Ray Absorption

The results of the research of a composite based on multi-walled carbon nanotubes (MWCNTs) decorated with CuO/Cu2O/Cu nanoparticles deposited by the cupric formate pyrolysis are discussed. The study used a complementary set of methods, including scanning and transmission electron microscopy, X-ray diffractometry, Raman, and ultrasoft X-ray spectroscopy. The investigation results show the good adhesion between the copper nanoparticles coating and the MWCNT surface through the oxygen atom bridge formation between the carbon atoms of the MWCNT outer graphene layer and the oxygen atoms of CuO and Cu2O oxides. The formation of the Cu–O–C bond between the coating layer and the outer nanotube surface is clearly confirmed by the results of the O 1s near edge X-ray absorption fine structure (NEXAFS) and X-ray photoelectron spectroscopy (XPS) of the Cu/MWCNTs nanocomposite. The XPS measurements were performed using a laboratory spectrometer with sample charge compensation, and the NEXAFS studies were carried out using the synchrotron radiation of the Russian–German dipole beamline at BESSY-II (Berlin, Germany) and the NanoPES station at the Kurchatov Center for Synchrotron Radiation and Nanotechnology (Moscow, Russia).

CHEMISORPTION OF L-CYSTEINE ON Au(111)/Si(111) AND $Si(111)\sqrt{3} \times \sqrt{3}-{\rm Au}$ SURFACES

2006 ◽  
Vol 13 (02n03) ◽  
pp. 197-200 ◽  
Author(s):  
MITSUNORI HONDA ◽  
FUMIHIKO MATSUI ◽  
HIROSHI DAIMON
Keyword(s):  
Chemical Shift ◽  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
The Other ◽  
Cooh Group ◽  
Xps Spectra ◽  
X Ray ◽  
Peak Intensity ◽  
Before And After ◽  
Intensity Ratios

The electronic structures of L-cysteine adsorbed on Au (111)/ Si (111) and [Formula: see text] surfaces were studied by using X-ray photoelectron spectroscopy (XPS). L-cysteine multilayers on Au (111)/ Si (111) and [Formula: see text] surfaces were prepared under UHV condition. L-cysteine monolayers were obtained by annealing such multilayer sample up to 130°C. In the case of the Au (111)/ Si (111) surface, we observed no chemical shift and no change in the peak intensity ratios among C1s , N1s , O1s and S 2p before and after annealing. On the other hand, the component attributed to COOH group in C1s spectra decreased after annealing. In addition, O1s XPS spectra of monolayer on the [Formula: see text] surface was composed of two distinct peaks, which indicates that there are two kinds of O atoms in different conformations. These observations indicate that the COOH group adsorbs directly to a surface atoms and dissociate by the interaction with the substrate Si (111) trimer atoms.

Electronic Structures of Transition-Metal Pernitrides Studied Using X-ray Absorption and Photoelectron Spectroscopy

2021 ◽  
Vol 90 (4) ◽  
pp. 044710
Author(s):  
Kazuo Soda ◽  
Daiki Kato ◽  
Mai Komabuchi ◽  
Toshiki Terabe ◽  
Shin Takayama ◽  
...  
Keyword(s):  
Transition Metal ◽  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
X Ray ◽  
X Ray Absorption

Electronic state analysis of Li2RuO3 positive electrode for lithium ion secondary battery

2020 ◽  
Vol 34 (07n09) ◽  
pp. 2040024
Author(s):  
Masatsugu Oishi ◽  
Ryoshi Imura ◽  
Tomoyuki Ueki ◽  
Keiji Shimoda ◽  
Hirona Yamagishi ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
Local Structure ◽  
Lithium Ion ◽  
Oxide Material ◽  
X Ray ◽  
Secondary Battery ◽  
Li Ion ◽  
X Ray Absorption

An investigation was made on the electronic structure of 4d transition metal layered oxide material of Li2RuO3 using X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The intensity of O [Formula: see text] pre-edge peak increased for Li ion extracted samples, suggesting increased ligand holes. The Ru 3d XPS spectrum suggested the variation of local structure around Ru ions by extraction of Li ions. We conclude that the delithiation from Li2RuO3 is charge compensated by O anions, and that the creation of the ligand holes reorganizes electronic structures composed of highly hybridized Ru 4d and O 2p orbitals.

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