Fig. 4From: Ag2S/CdS/TiO2 Nanotube Array Films with High Photocurrent Density by Spotting Sample MethodThe composition and crystalline structures of the TNTs (a), CdS/TNTsĀ (b), and Ag2S/CdS/TNTsĀ (c) by SSM characterized using XRD and the XRD patterns (A for Ag2S, and C for CdS; solid circle for Ag2S, solid square for CdS, and solid triangle for TiO2) Back to article page