Fig. 3. (A) Diffuse reflectance spectra of the Zn1−xCdxS solid-state photocatalysts, with x = 0 to 1. (B) Tauc plot for determining the bandgap for Zn0.7Cd0.3S, CdS and ZnS. (C) Photoluminescence spectra for Zn0.7Cd0.3S (green dots) and Zn0.8Cd0.2S (purple dots) samples obtained under excitation at 440 nm, corresponding to the mean bandgap separation energy of both samples.
