ArticleMicroscopy (Oxford, England)2026
Analysis of photo-functional materials using momentum-resolved EELS.
Article in Microscopy (Oxford, England), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Momentum transfer (q)-resolved electron energy-loss spectroscopy (q-EELS) is a powerful tool for analyzing photo-functional materials. The technique's application has been demonstrated in several recent studies. This study first investigated the anisotropic plasmon oscillations in Cs-doped hexagonal WO3, a near-infrared (NIR) shielding material, to understand the origin of its highly efficient light-scattering properties. This revealed how plasmon energies differ along different crystallographic directions, contributing to the broad NIR absorption capabilities of the material. Second, the study measured the q dispersion of carrier plasmons and thus quantified interactions (exchange-correlation effect) between carrier electrons in LaB6 crystals, another NIR shielding filter. This analysis provides critical insights into many-body effects not captured by the ideal free-electron gas model. Finally, the spatial spread sizes of excitons in anatase TiO2 were determined, establishing a correlation between the exciton size and the anisotropic photocatalytic activity of anatase TiO2. Collectively, this research demonstrates that q-EELS provides unique, q-dependent information on electronic excitations, deepening our understanding of the properties governing the performance of advanced materials.
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