- Names
-
- Amazigh Ouaksel
- Vladimir Vidal
- Olivier Proux
- Christine Pailles
- Jerome Rose
- Melanie Auffan
- Title
- Coupling High-Energy Resolution Fluorescence Detected X-ray Absorption Spectroscopy with Microfluidic Cells for in Situ Monitoring of Tungsten Nanoparticles Redox Transformation
- Abstract
- Tungsten is a redox-sensitive transition element that is of strategic importance for many industrial applications. The functionalities of tungsten-based materials are highly dependent on W’s atomic structure and oxidation state (0, IV, and VI), and the same applies to the toxicity of tungsten compounds. However, assessing tungsten speciation and structural changes in complex materials and environmental matrices poses significant challenges necessitating highly sensitive analysis as well as in situ monitoring on a short time scale. We demonstrated that the better energy resolution in HERFD-XAS (energy bandwidth between 1.2 to 1.5 eV) at the L3-edge with Lα1 and Lβ2 emission lines would allow the separation, characterization, and quantification of subtle changes in the XAS spectrum associated with specific electronic transitions in W(0), W(IV), and W(VI). Moreover, HERFD-XAS combined with a microfluidic chip proved to be suitable for in situ monitoring of changes in W redox states with second-scale temporal resolution. We noted that such an experimental setup would be particularly useful for providing direct insight into the rapid changes in W speciation that would occur under oxidizing environmental conditions.
- Keywords
- Tungsten nanoparticles, HERFD-XAS
- Content
- spectral data
- Year
- 2023
- Journal
- ACS Earth and Space Chemistry
- Volume
- 7
- Number
- 12
- Pages
- 2353 - 2363
- Document type
- article
- Publication state
- published
- Doi
- 10.1021/acsearthspacechem.3c00217
- Identifiers
- Experiment/Spectra
-
- W L3 edge XAS HERFD of Sodium polytungstate 3NaWO4.9WO3.H2O at 10 K
- W L3 edge XAS HERFD of Phosphotungstic acidH3[P(W3O10)4] · xH2O at 10 K
- W L3 edge XAS HERFD of Tungsten at 10 K
- W L3 edge XAS HERFD of Tungsten oxide WO2 at 10 K
- W L3 edge XAS HERFD of Tungsten oxide WO3 at 10 K
- W L3 edge XAS HERFD of Metal tungsten nanoparticles at 10 K
- W L3 edge XAS HERFD of Tungsten oxide WO3_nanoparticles at 10 K
- W L3 edge XAS HERFD of Sodium tungstate NaWO4.2H2O at 10 K