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High-angle annular dark-field (HAADF) imaging (a) and color-coded STEM-EDS elemental mapping (b–e) showing the distribution of oxygen (green) (b), chromium (yellow) (c), silver (blue) (d) and gold (red) (e) after film oxidation for 30 min at 100 W. (F) RGB STEM-EDS image. Scale bar 100 nm.
