Abstract
CdS nanocrystals with an average diameter of 16 nm were synthesized in the CTAB/ n-C 5H 11OH/ n-C 6H 14/water quaternary microemulsions by a two-step hydrothermal process at 90 and 130 °C. The reaction of carbamide and carbon disulfide was employed as the sulfur source for the preparation of CdS nanocrystals. The resulting crystals were characterized with powder X-ray diffraction, transmission electron microscopy, UV–vis absorption spectroscopy, and photoluminescence spectroscopy. A unique core/shell structure of CdS nanocrystals was suggested for the explanation of the interesting phenomenon.
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