Abstract
CdS quantum dots(QDs)of 2.5nm were prepared using G4.5 PAMAM dendrimer templates and characterized by HRTEM and EDS.The aging of synthesized QDs stored in the dark at room- temperature was studied through UV-vis and PL spectrophotometer.The width at half-maximum of the peak(WHM)of the UV-vis and PL spectra becomes narrower,meanwhile the PL intensity increases obviously during the first 5d.Afterwards,the WHM gets broader and the PL intensity decreases slowly during the following 6 months.The results suggest that CdS QDs show a size-focusing growth within the first 5d,but a size-defocusing growth in the following 6 months.However,the increment of CdS QDs size is less than 0.3nm,and the decrement of PL intensity is about 22% after 6 months of aging. The excellent resistance to aging of CdS QDs is attributed to the coordination and template effects of PAMAM dendrimers.
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