Study on the Resistance to Aging of CdS Quantum Dots Encapsulated by PAMAM Dendrimers

doi:10.3724/SP.J.1077.2008.00379

Abstract

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.

Key words: CdS quantum dots, PAMAM dendrimer, photoluminescence, aging

CLC Number:

O614

CONG Ri-Min,LUO Yun-Jun,YU Huai-Qing. Study on the Resistance to Aging of CdS Quantum Dots Encapsulated by PAMAM Dendrimers[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00379.

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Study on the Resistance to Aging of CdS Quantum Dots Encapsulated by PAMAM Dendrimers

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