Figure 4 | Scientific Reports

Figure 4

From: Sub-nanometer surface chemistry and orbital hybridization in lanthanum-doped ceria nano-catalysts revealed by 3D electron microscopy

Figure 4

Analysis of orbital hybridization. (a–c) ICA decomposition for a second La-doped ceria nanoparticle aggregate. (a) Spatial distribution maps, (b) component spectra at the La and Ce M 45 edges, and (c) component spectra at the O K edge. Arrows mark plural scattering features. (d–f) Model-based tomographic EELS analysis: (d) 3D volume visualization of the core-shell aggregate, (e) corresponding spectra at the La and Ce M 45 edges, and (f) corresponding spectra at the O K edge (Ce and O edges are both from the second aggregate). Dashed lines and letters indicate spectral features attributed to characteristic orbital hybridization signatures. The three prominent peaks were assigned as (A) Ce(4f)-O(2p), (B) Ce(5d e g )-O(2p), and (C) Ce(5d t 2g )-O(2p). Scale bars are 25 nm.

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