The Cd-S stretching band is delineated by the bands at 650 cm -1 and 730 cm -1 . Water bending vibrations are ascribed to the bands at 1620 cm -1 and 3550 cm -1 , while adsorbed water O-H stretching on the surface of CdS is ascribed to the band at . The stretching at 872.65 cm -1 in the case of pristine CdS is consistent with Cd-S stretching . The peak at 1115 cm -1 corresponds to the C-O bonds present in SO-CdS. Except for a more noticeable peak at 1115 cm -1 , the FT-IR spectra of the 1-10% C/CdS nanorods were identical to those of the pristine CdS nanorods . This might be due to the existence of C-O bonds connected to the carbon of Spinacia oleracea that is produced from biomass. Furthermore, because of the steric hindrance caused by C on Cd-S bonds, the peak at 613 cm -1 became less acute as the carbon weight percentage in SO-CdS increased .