Spatially resolved electronic modifications of a thin poly(acrylonitrile) film induced by synchrotron radiation white beam

1992 ◽  
Vol 96 (14) ◽  
pp. 5917-5921 ◽  
Author(s):  
Daniel Guay ◽  
Gerard Tourillon ◽  
Pascal Viel ◽  
Gerard Lecayon
Keyword(s):  
Synchrotron Radiation ◽  
Spatially Resolved ◽  
White Beam ◽  
Poly Acrylonitrile

scholarly journals Sample Environment for Operando Hard X-ray Tomography—An Enabling Technology for Multimodal Characterization in Heterogeneous Catalysis

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 459
Author(s):  
Johannes Becher ◽  
Sebastian Weber ◽  
Dario Ferreira Sanchez ◽  
Dmitry E. Doronkin ◽  
Jan Garrevoet ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Synchrotron Radiation ◽  
Contrast Imaging ◽  
Co2 Methanation ◽  
Full Field ◽  
X Ray ◽  
Spatially Resolved ◽  
Oxidation Of Methane ◽  
Unique Source ◽  
Sample Environment

Structure–activity relations in heterogeneous catalysis can be revealed through in situ and operando measurements of catalysts in their active state. While hard X-ray tomography is an ideal method for non-invasive, multimodal 3D structural characterization on the micron to nm scale, performing tomography under controlled gas and temperature conditions is challenging. Here, we present a flexible sample environment for operando hard X-ray tomography at synchrotron radiation sources. The setup features are discussed, with demonstrations of operando powder X-ray diffraction tomography (XRD-CT) and energy-dispersive tomographic X-ray absorption spectroscopy (ED-XAS-CT). Catalysts for CO2 methanation and partial oxidation of methane are shown as case studies. The setup can be adapted for different hard X-ray microscopy, spectroscopy, or scattering synchrotron radiation beamlines, is compatible with absorption, diffraction, fluorescence, and phase-contrast imaging, and can operate with scanning focused beam or full-field acquisition mode. We present an accessible methodology for operando hard X-ray tomography studies, which offer a unique source of 3D spatially resolved characterization data unavailable to contemporary methods.

A New White Beam Powder Diffraction Facility at the Daresbury Laboratory Synchrotron Radiation Source

1996 ◽  
Vol 228-231 ◽  
pp. 213-218 ◽  
Author(s):  
S.M. Clark ◽  
Robert J. Cernik ◽  
A. Grant ◽  
S. York ◽  
P.A. Atkinson ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Powder Diffraction ◽  
Radiation Source ◽  
Synchrotron Radiation Source ◽  
White Beam

scholarly journals Structure and Chemical Organization in Damselfly Calopteryx haemorrhoidalis Wings: A Spatially Resolved FTIR and XRF Analysis with Synchrotron Radiation

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Susan Stuhr ◽  
Vi Khanh Truong ◽  
Jitraporn Vongsvivut ◽  
Tobias Senkbeil ◽  
Yang Yang ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Xrf Analysis ◽  
Spatially Resolved

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.

In situ depth-resolved synchrotron radiation X-ray spectroscopy study of radiation-induced Au deposition

2019 ◽  
Vol 26 (6) ◽  
pp. 1940-1944
Author(s):  
Guang Chen ◽  
Yonghua Du ◽  
Pengfei An ◽  
Lirong Zheng ◽  
Shengqi Chu ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Chemical Species ◽  
Reduction Reaction ◽  
Spectroscopy Study ◽  
Contrast Imaging ◽  
X Ray ◽  
Spatially Resolved ◽  
Radiation Induced

To illustrate the process of synchrotron radiation induced reduction of tetrachloroauric solutions, a confocal synchrotron radiation X-ray spectroscopy experiments system has been introduced to monitor the depth-resolved elemental Au distribution and chemical species during the Au reduction reaction. Combining the results from confocal X-ray spectroscopy with that from X-ray contrast imaging, the mechanism of synchrotron radiation induced Au reduction, along with the process of Au deposition, were proposed. These demonstrations provide novel avenues to spatially resolved analysis of in situ solution radiolysis.

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