Control of the optical properties of cadmium selenide nanoparticles using magadiite.

The preparation of cadmium selenide nanoparticles in the interlayer space of magadiite, a layered sodium silicate, modified with the cetyltrimethylammonium cation was studied. The preparation was based on the formation of cadmium selenide by the reaction between the cetyltrimethylammonium modified magadiite and an aqueous mixture of cadmium sulfate and sodium selenosulfite at room temperature. The resulting hybrids were characterized by XRD, FT-IR, HRTEM, TG-DTA, as well as UV-visible and photoluminescence spectroscopy. The expansion of the interlayer spaces as well as TG-DTA results indicated the presence of the cetyltrimethylammonium cation and cadmium selenide in the hybrids. The HRTEM images showed the presence of cadmium selenide in the diameter range of 2-3 nm in the interlayer space of magadiite. The luminescence intensity of the cadmium selenide varied depending on the particle size, which was controlled by the loading amount of cadmium selenide precursor.