Effect of heat-treatment on CdS and CdS/ZnS nanoparticles
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Mono-dispersed and spherical cadmium sulfide (CdS) nanoparticles and cadmium sulfide/zinc sulfide (CdS/ZnS) nanoparticles, 4–5 nm in diameter, were synthesized in a heptane-AOT-water microemulsion system. The heat treatment of CdS and CdS/ZnS nanoparticles was annealed at 570 °C under the air atmosphere. The heat-treated nanoparticles were of variable large sizes and had enhanced crystallinity. UV–Vis spectra of heat-treated CdS and CdS/ZnS nanoparticles revealed a flat shape similar to that of bulk CdS compounds. The difference between the PL emission bands of organic-coated nanoparticles and heat-treated nanoparticles was small. The PL emission energy of heat-treated nanoparticles was improved by about 2–3 times compared with that of organic-coated nanoparticles.
KeywordsMicroemulsion System Follow Heat Treatment Dioctyl Sulfosuccinate Zinc Acetate Dehydrate Dioctyl Sulfosuccinate Sodium
The authors are grateful for financial support for this work from the Carbon Dioxide Reduction and Sequestration Center, a 21st Century Frontier R&D Program funded by the Ministry of Science and Technology of Korea.
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