| 초록 |
The monodispered and spherical Cadmium sulfide (CdS) and cadmium sulfide/zinc sulfide (CdS/ZnS) nanoparticles of 4~5nm in diameter were synthesized from an aqueous cadmium acetate dehydrate (Cd(CH3COO)2∙2H2O), zinc acetate dehydrate (Zn(CH3COO)2∙2H2O), and sodium sulfide nonahydrate (Na2S∙9H2O) solution in a heptane-AOT-water microemulsion system. The heat-treatment of CdS and CdS/ZnS nanoparticles was progressed under air and 570℃condition. The heat-treatment effects of the nanoparticles were characterized by FT-IR, TGA, and TEM. The heat-treated nanoparticles were coated by sulfate compound instead of organic compound like AOT. The heat-treated nanoparticles have various and large size and enhanced crystallinity. The luminescent properties of the nanoparticles were characterized by UV-vis absorption and PL spectra. UV-vis spectra of heat-treated CdS and CdS/ZnS nanoparticles are flat type like bulk CdS compounds. The difference of the PL emission band of nanoparticles coated organic material and heat-treated nanoparticles is small. The PL emission energy of heat-treated nanoparticles improves about 2~3 times higher than it of organic-coated ones. |
