Abstract
Nanosecond transient absorption spectra of thioglycerol-capped cadmium sulfide particles (TG-CdS) were measured in various solvents containing dissolved oxygen. The transient absorption spectrum of TG-CdS observed immediately after laser excitation in water is a broad one with absorption maximum near 700 nm and is very different from those of TG-CdS in organic solvents (DMF, DMSO) and that of thiophenolate-capped CdS particles (PhS-CdS) in acetonitrile reported previously. This transient absorption around 700 nm is attributable mainly to hydrated electrons, comparing with that of HMP-CdS (aqueous CdS colloidal solutions containing sodium hexametaphosphate as a stabilizer for the colloids) which is known to produce hydrated electrons by electron ejection from the particles with the interaction of two electron-hole pairs. The effects of electron and hole scavengers, solvent and the laser intensity on the transient absorption spectra also support this conclusion. It seems that the large differences in the decay dynamics and the shape of the transient absorption between TG-CdS in water and PhS-CdS in acetonitrile mainly result from the difference in solvent rather than the difference in the hole trapping ability between thiophenol and thioglycerol.
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