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Figure 2. Morphological and atomic-level characterization of mesoporous SnO₂ nanospheres sensitized with atomically dispersed Au. (A) Schematic illustration of the formation of mesoporous SnO₂ nanospheres with atomically dispersed Au; (B) SEM image and (C) HAADF-STEM image of atomically dispersed Au-functionalized mesoporous SnO₂ nanospheres; (D) X-ray photoelectron spectroscopy spectra of Au 4f; (E) XANES spectra and (F) Wavelet transform analysis of EXAFS. Reproduced with permission from Ref.^[21]. Copyright 2024, American Chemical Society. NC: Nanocluster; SEM: scanning electron microscopy; HAADF-STEM: high-angle annular dark-field scanning transmission electron microscopy; XANES: X-ray absorption near-edge structure; EXAFS: X-ray absorption fine structure.