Effect of different capping environments on the optical properties of CdS nanoparticles in reverse micelles

TitleEffect of different capping environments on the optical properties of CdS nanoparticles in reverse micelles
Publication TypeJournal Article
Year of Publication1999
AuthorsZou, BS, Little, RB, Wang, J, EL-Sayed, MA
JournalInternational Journal of Quantum Chemistry
Volume72
Pagination439-450
Date PublishedApr
ISBN Number0020-7608
Accession NumberWOS:000079167400022
Abstract

CdS(E = 2.5 eV) nanoparticles were synthesized in reversed micelles and capped with materials of different band gaps and charge compensation ability: Cd(OH)(2) (4.0 eV), ZnS (3.2 eV), and CdO (2.3 eV). The preparations allowed the examination and comparison of the efficiencies of confinement of the electron and hole by the various capping materials. The absorption and emission spectra of the capped CdS nanoparticles suggest the following: (1) Efficient capping and strong quantum confinement are observed for CdS particles of small size (< 3.8 nm), showing well-resolved photoexcitation spectra; (2) the confinement efficiency improves with capping thickness; (3) although ZnS has smaller band gap than Cd(OH)(2), it was more efficient in surface-charge compensation and it is the best capping agent of the three materials; and (4) the similar band gaps of CdO and CdS resulted spectroscopically in strong mixing between the excited states of these materials. (C) 1999 John Wiley & Sons, Inc.

DOI10.1002/(sici)1097-461x(1999)72:4<439::aid-qua27>3.0.co;2-q