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SEM images of (A) TiO2 nanoparticles, (B) GO/N-doped TiO2, (C) GO/N-doped TiO2/CdS/ZnS, (D) GO/N-doped TiO2/CdS/Mn-doped ZnS, (E) GO/N-doped TiO2/CdS/Mn-doped ZnS/Zn-porphyrin, and (F) cross-sectional view of GO/N-doped TiO2/CdS/Mn-doped ZnS/Zn-porphyrin.
