Photophysical and photoelectrochemical characteristics of multilayers of CdS nanoclusters

Abstract

Luminescence lifetime measurements in sub-ns time resolution and visible pump–IR absorption probe measurements to study photo-induced carrier dynamics using fs laser pulses were carried out for the CdS nanoclusters prepared by reverse micelle method, the nanoclusters modified with 2-mercaptoethanesulfonate (SO₃–CdS) in water, and the SO₃–CdS nanoclusters in a multilayer assembly. For a comparison, similar measurements were also carried out for a CdS nanocluster doped glass. The photoelectrochemical characteristics of the multilayer are also measured. The characteristics of nanocluster dispersion and those of multilayer assembly are compared. The sample dependent decay behaviors of luminescence and IR absorption are somewhat different and the importance of visible pump–IR absorption probe measurement is demonstrated.