| Abstract |
Mixed cadmium sulfide-zinc sulfide (CdS-ZnS) has attracted considerable attention because of its tunable optical properties depending on the size and surface property. Here, the insertion of CdS-ZnS into pristine and hexadecyltrimethylammonium (HDTMA)-montmorillonites was investigated to tune the optical behaviors in visible region by controlled aggregation through host-guest interactions.
The aqueous solutions of CdCl2, ZnCl2 and Na2S·xH2O were poured into a dispersion of pristine or organically modified montmorillonite and mixed overnight. The molar ratio of Cd(II) and Zn(II):S was 1:1 for both procedures. Hereafter, the hybrids were designated as CdS-ZnS-montmorillonite and CdS-ZnS-HDTMA-montmorillonite.1,2 The interlayer distances (d001) were 1.50 and 1.90 nm for CdS-ZnS- and CdS-ZnS-HDTMA-montmorillonite, indicating the intercalation of CdS-ZnS and/or HDTMA ions. The absorption onsets were observed at 478 nm for CdS-ZnS-montmorillonite and at 501 nm for CdS-ZnS-HDTMA-montmorillonite, which were attributed to the existence of CdS-ZnS in the host materials. The hybrids exhibited the similar photoluminescence at 413, 440 and 469 nm that resulted from the emission of the intercalated ZnS (413 and 440 nm) and CdS (469 nm).3 The PL intensity of CdS-ZnS-montmorillonite was lower than that of CdS-ZnS-HDTMA-montmorillonite, suggesting self-quenching of mixed CdS-ZnS in montmorillonite.
|
Publication
Journal Publication
ไทย