Fig. 1

FESEM images and XRD patterns of ZnO and ZnO/ZnS core-shell nanorod arrays. a Top view FESEM image of ZnO nanorod array. Inset: high-magnification FESEM image of the ZnO nanorod. b Cross-sectional view of ZnO nanorod array. c Top view FESEM image of ZnO/ZnS core-shell nanorod array with seven SILAR cycles. Inset: high-magnification FESEM image of the ZnO/ZnS core-shell nanorod. d XRD patterns of ZnO nanorod arrays (black line) and ZnO/ZnS core-shell nanorod arrays (red line) grown on the FTO glass with seven SILAR cycles. e EDX data collected from the ZnO/ZnS core-shell nanorod arrays