X-Ray Absorption Spectroscopy Applications in Nanomaterials
Summary
X-Ray Absorption Spectroscopy (XAS) is a powerful, element-specific technique that probes the local structure and electronic state of matter at the nanoscale. By measuring how a material absorbs X-rays as a function of energy, one can extract the X-ray Absorption Near-Edge Structure (XANES) and the Extended X-ray Absorption Fine Structure (EXAFS). These complementary regimes reveal oxidation state, coordination environment, bond lengths and disorder around absorbing atoms. In nanomaterials, where surface-to-volume ratios and interfacial effects dominate, XAS offers unique insight into atomic-level transformations during synthesis, employment and degradation. Recent advances include high-throughput computational workflows that generate extensive reference spectra, automated algorithms to match experimental profiles, and the application of machine learning to invert spectral features into structural descriptors. In situ and operando measurements have mapped dynamic changes in catalysts under working conditions, correlating structural evolution with performance in energy conversion or chemical synthesis. Together, these innovations are accelerating rational design of nanostructured materials for catalysis, electronics, environmental remediation and energy storage.
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X-Ray Absorption Spectroscopy Applications in Nanomaterials publication trend
The graph below shows the total number of articles in x-ray absorption spectroscopy applications in nanomaterials across all publications each year (not limited to Nature Index journals).
Technical terms
XAS: X-Ray Absorption Spectroscopy, an element-selective method for probing local atomic and electronic structure.
XANES: X-ray Absorption Near-Edge Structure, the region close to the absorption edge sensitive to oxidation state and coordination geometry.
EXAFS: Extended X-ray Absorption Fine Structure, oscillatory variations beyond the edge that yield interatomic distances and disorder information.
Coordination environment: The number and arrangement of neighbouring atoms immediately surrounding an absorbing atom.
Operando: In situ measurement under actual working conditions to correlate structural changes with functional performance.
References
- Automated generation and ensemble-learned matching of X-ray absorption spectra. npj Computational Materials (2018).
- EXAFS and XANES analysis of oxides at the nanoscale. IUCrJ (2014).
- High-throughput computational X-ray absorption spectroscopy. Scientific Data (2018).
- Mapping XANES spectra on structural descriptors of copper oxide clusters using supervised machine learning. The Journal of Chemical Physics (2019).
- Linking the evolution of catalytic properties and structural changes in copper–zinc nanocatalysts using operando EXAFS and neural-networks. Chemical Science (2020).
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