Figure 1

(a) Top view SEM image of pristine ZnO. (b) Top view SEM image of ZnO/Au. (c) A low-magnification TEM image and (d) a HRTEM image of ZnO/Au/Al₂O₃ (5cycles). (e) XRD patterns of the ZnO/Au/Al₂O₃ (5 cycles) on the FTO substrate. XPS spectra of ZnO/Au/Al₂O₃ (5 cycles): (f) wide scan, (g) Au 4f and (h) Al 2p.