Effect of heat-treatment on CdS and CdS/ZnS nanoparticles
Autor: | Won Keun Chung, Byung Jea Kim, Kwanhwi Park, Hong Jeong Yu, Sung Hyun Kim |
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Rok vydání: | 2009 |
Předmět: | |
Zdroj: | Journal of Materials Science. 44:4315-4320 |
ISSN: | 1573-4803 0022-2461 |
DOI: | 10.1007/s10853-009-3641-2 |
Popis: | 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. |
Databáze: | OpenAIRE |
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