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Analysis of photo-functional materials using momentum-resolved EELS.

Yohei K Sato1

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aobaku, Sendai, Miyagi, 980-8577, Japan.

Microscopy (Oxford, England)
|February 13, 2026
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Summary

Momentum-resolved electron energy-loss spectroscopy (q-EELS) reveals how electronic excitations influence material properties. This study used q-EELS to analyze plasmons in WO3 and LaB6, and excitons in TiO2, linking them to material performance.

Keywords:
anisotropic optical propertyelectron energy-loss spectroscopyexchange–correlation effectlocal field correctionnear-infrared light scatteringphotocatalysis

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Spectroscopy

Background:

  • Momentum transfer (q)-resolved electron energy-loss spectroscopy (q-EELS) is crucial for understanding electronic excitations in photo-functional materials.
  • Previous studies have highlighted the utility of q-EELS in materials analysis.

Purpose of the Study:

  • To investigate anisotropic plasmon oscillations in Cs-doped hexagonal WO3 for near-infrared (NIR) shielding applications.
  • To quantify carrier plasmon interactions in LaB6 crystals using q-dispersion measurements.
  • To correlate exciton spatial spread size with photocatalytic activity in anatase TiO2.

Main Methods:

  • Utilized momentum transfer (q)-resolved electron energy-loss spectroscopy (q-EELS).
  • Analyzed anisotropic plasmon oscillations in Cs-doped hexagonal WO3.
  • Measured q-dispersion of carrier plasmons in LaB6.
  • Determined exciton spatial spread sizes in anatase TiO2.

Main Results:

  • Observed differences in plasmon energies along crystallographic directions in WO3, explaining its NIR absorption.
  • Quantified carrier electron interactions in LaB6, revealing many-body effects beyond the free-electron model.
  • Established a correlation between exciton size and anisotropic photocatalytic activity in TiO2.

Conclusions:

  • q-EELS provides unique, q-dependent insights into electronic excitations.
  • The study deepens the understanding of properties governing advanced material performance.
  • Demonstrated the power of q-EELS in elucidating origins of photo-functional properties.