X-ray absorption and luminescence properties of metallic copper nanoparticles embedded in a glass matrix

In this paper, we reported on the X-ray photoemission electron microscope (XPEEM) determination of magnetic and luminescence origins for two Co x Zn 1-x O films. The cobalt fraction x of radio frequency co-sputtered samples were 0.86(2) and 0.92(2), respectively. Films were ferromagnetic and semiconductive. Unique narrow green color lines beside the ZnO intrinsic emissions were found with a decay time in microsecond range at room temperature. Origins of magnetic and luminescence properties were determined with XPEEM. The X-ray absorption near edge structure at the Co L3-edge denoted that Co was partially oxidized, and phase-contrast images together with chemical composition identification further proved that Co and CoO co-existed in the samples. The ferromagnetism was attributed to ferromagnetism of Co clusters partially canceled by the antiferromagnetism of its oxide, and the photoluminescence to bound exciton in ZnO nanoclusters and defect related centers of ZnO nanoclusters in a Co -rich matrix. Present results show possibilities for adjusting magnetic and luminescence properties of Co – ZnO compounds by changing the cobalt concentration.

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XANES STUDY OF COPPER NANOPARTICLES IN THE ELECTROCHEMICAL REACTION OFLiWITHCuO

International Journal of Nanoscience ◽

10.1142/s0219581x02000474 ◽

2002 ◽

Vol 01 (05n06) ◽

pp. 443-447 ◽

Cited By ~ 3

Author(s):

HYUN CHUL CHOI ◽

YOUNG MEE JUNG ◽

SEUNG BIN KIM

Keyword(s):

Copper Nanoparticles ◽

Electrochemical Reaction ◽

Lithium Content ◽

Edge Structure ◽

X Ray ◽

Content System ◽

X Ray Absorption

The electrochemical insertion–deinsertion of lithium into CuO electrode was examined by Cu K-edge X-ray absorption near edge structure (XANES) during the first electrochemical cycle. The XANES spectra in the LixCuO (x: lithium content) system reveal that the initial insertion of lithium leads to the reduction of the Cu2+in the pristine CuO to form the reduced nanosized Cu metal. In the successive deinsertion of lithium, the reduced Cu particles changed partially to the phase of Cu2O .

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X-ray absorption spectroscopy investigations on electronic structure and luminescence properties of Eu:SnO2-SnO nanocomposites

Current Applied Physics ◽

10.1016/j.cap.2016.08.005 ◽

2016 ◽

Vol 16 (10) ◽

pp. 1342-1348 ◽

Cited By ~ 5

Author(s):

Aditya Sharma ◽

Mayora Varshney ◽

Hyun Joon Shin ◽

Keun Hwa Chae ◽

Sung Ok Won

Keyword(s):

Electronic Structure ◽

Absorption Spectroscopy ◽

Luminescence Properties ◽

X Ray ◽

X Ray Absorption

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

Journal of Synchrotron Radiation ◽

10.1107/s1600577516014399 ◽

2016 ◽

Vol 23 (6) ◽

pp. 1424-1432 ◽

Cited By ~ 1

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.

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Structural study of thin films prepared from tungstate glass matrix by Raman and X-ray absorption spectroscopy

Applied Surface Science ◽

10.1016/j.apsusc.2008.02.107 ◽

2008 ◽

Vol 254 (17) ◽

pp. 5552-5556 ◽

Cited By ~ 8

Author(s):

Bianca Montanari ◽

Anne J. Barbosa ◽

Sidney J.L. Ribeiro ◽

Younes Messaddeq ◽

Gaël Poirier ◽

...

Keyword(s):

Thin Films ◽

Structural Study ◽

Absorption Spectroscopy ◽

Glass Matrix ◽

X Ray ◽

X Ray Absorption

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An Estimation of the Optical Constants of Copper Based on the FEFF 9 Package

Acta Universitaria ◽

10.15174/au.2021.3215 ◽

2021 ◽

Vol 31 ◽

pp. 1-20

Author(s):

Gildardo Rivas Valles

Keyword(s):

First Principles ◽

Optical Constants ◽

Metallic Copper ◽

Real Space ◽

Index Of Refraction ◽

Complex Dielectric Constant ◽

X Ray ◽

Energy Dependent ◽

X Ray Absorption ◽

Complex Index Of Refraction

The FEFF software package is based on a first-principles real space Green function (RSMS) scattering theory to calculate X-ray absorption fine-structure (XAFS), and forward scattering amplitudes (FSA). From these, an energy-dependent complex dielectric constant can be calculated, and from it other “optical constants”, like the complex index of refraction, absorption coefficient, the reflectance, and energy-loss function, can be derived. A procedure to estimate these using FEFF version 9 is outlined applied to crystalline metallic copper as an example, and the results compared to values taken from the literature.

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Investigation on cation distribution and luminescence in spinel phase γ-Ga3−δO4 : Sm nanostructures using X-ray absorption spectroscopy

RSC Advances ◽

10.1039/c7ra10341g ◽

2017 ◽

Vol 7 (83) ◽

pp. 52543-52554 ◽

Cited By ~ 10

Author(s):

Aditya Sharma ◽

Mayora Varshney ◽

Hyun-Joon Shin ◽

Keun Hwa Chae ◽

Sung Ok Won

Keyword(s):

Absorption Spectroscopy ◽

Cation Distribution ◽

Spinel Phase ◽

Luminescence Properties ◽

X Ray ◽

Octahedral Sites ◽

Spectroscopic Investigations ◽

X Ray Absorption

In this study, spectroscopic investigations are employed to quantify the Ga distribution over the tetrahedral/octahedral sites and to assimilate the luminescence properties in the barely reported γ-Ga2.67O4 : Sm nanoparticles.

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