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FESEM images. (a) Surface of SnO2 thin film (glancing angle = 0°); (b) Surface and cross-section of SnO2 thin film (glancing angle = 85°); (c) Surface and cross-section of Au-catalyzed SnO2 thin film (glancing angle = 85°); (d) Surface and cross-section of Ag-catalyzed SnO2 thin film (glancing angle = 85°).
