EPSRC OPEN ACCESS DATA THIS DATA WAS COLLECTED USING EQUIPMENT FUNDED WITHIN THE UK LASER LOAN POOL (EP/G03088X/1) Figure 1E) Transient absorption spectra recorded 1 ps following excitation of different size CdS QDs in aqueous solution, horizontal dotted line represents ΔA equal to zero. Figure 2: A), B), C) and D) The transient absorption recovery recorded at the bleaching maximum following excitation of four sizes CdS QDs in aqueous solution without and with decorated Pt. Transient absorption spectra of 4.6 nm CdS QDs E) without and F) with decorated Pt at selected time delays. G) The transient bleaching recovery of 2.8 nm Pt/CdS without and with addition of MV2+. H) The transient bleaching recovery of four sizes Pt/CdS with addition of MV2+.