Figure 2

UV-Vis absorption spectra of pristine ZnO, ZnO/Au and ZnO/Au/Al2O3 (5 cycles).
The inset is the corresponding (ahv)n vs hv curves of the three samples. Here, n evaluated to be two.

UV-Vis absorption spectra of pristine ZnO, ZnO/Au and ZnO/Au/Al2O3 (5 cycles).
The inset is the corresponding (ahv)n vs hv curves of the three samples. Here, n evaluated to be two.