Abstract
Ultrafast carrier dynamics of Cd0.992Ni0.008S nanoparticles with and without Pt have been investigated using femtosecond transient absorption spectroscopy (fs-TA) with broadband capabilities. A strong ground state bleaching (GSB) feature around 480 nm and a broad photo-induced absorption (PIA) feature around 600 nm were assigned for electron and hole signatures in Cd0.992Ni0.008S, respectively. In order to validate the inferences made from fs-TA studies, we have examined the photo-catalytic performance of Cd0.992Ni0.008S and Pt/Cd0.992Ni0.008 in the presence of a complex medium composed of acetic acid and benzyl alcohol. The results show that the Ni doping in Pt/CdS not only enhances the photocatalytic performance of the Pt/CdS but also improves the photo-stability by removing the photo-generated hole efficiently. Figure 1
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