Transient optical properties of novel PbS nanoparticles coated with 2,6-O-diallyl-beta-CD

The transient optical properties of novel PbS nanoparticles coated with 2,6 -O-diallyl-beta-cyclodextrines (CDs) were studied by the femtosecond pump-p robe technique. The results show that the ultrafast transient-induced absor ption for the novel case. Compared to the PbS nanoparticles stabilized with polyvinyl alcohol (PVA), we find that the process for the novel case is di fferent from the PbS(PVA). We suggest that the CDs surface modification can trap holes on the surface of PbS nanoparticles. This can induce an efficie nt charge separation between the PbS nanoparticles and its surface and resu lt in an ultrafast-induced absorption for novel PbS nanoparticles. (C) 1999 Elsevier Science B.V. All rights reserved.