Preparation and optical properties of blue-emitting colloidal CdS nanocrystallines by the solvothermal process using poly (ethylene oxide) as the stabilizer |
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Authors: | Chien-Ming Wei Sheng-Shu Hou |
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Institution: | (1) Department of Chemical Engineering, National Cheng Kung University, Tanian, 701, Taiwan |
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Abstract: | Blue-emitting colloidal CdS nanocrystals have been synthesized through the solvothermal reaction of cadmium acetate and thiourea
in N,N-dimethylformamide using poly(ethylene oxide; PEO) as the stabilizing polymer. The as-prepared CdS colloids were stable at
ambient conditions for several weeks. The PEO-stabilized CdS colloids showed a narrow fluorescence band with the maximum at
about 420 nm and thus emitting blue fluorescence under the ultraviolet (UV) lamp. A common red shift of fluorescence band
is not detected for the prepared CdS colloids in the study, indicating that PEO-stabilized CdS NCs possess few crystalline
defects on their surface. In addition, transmission electron microscope micrographs reveal that the sizes of CdS NCs are between
4.4 to 5.4 nm with small standard deviations from 0.5 to 0.7 nm. The particle growth kinetics was studied by monitoring UV-visible
absorption onsets versus the reaction time and was found to nearly follow the Lifshitz–Slyozov–Wagner theory for the Ostwald
ripening mechanism. |
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Keywords: | PEO Colloidal CdS Solvothermal Nanocrystals |
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