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Porphyrin decorated CdSe quantum dots for direct fluorescent sensing of metal ions

Frasco, Manuela F. and Vamvakaki, Vicky and Chaniotakis, Nikos (2010) Porphyrin decorated CdSe quantum dots for direct fluorescent sensing of metal ions. Journal of Nanoparticle Research, 12 (4). pp. 1449-1458.

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Abstract

In this study, we report on a novel hybrid structure for the direct sensing of metal ions based on the use of CdSe quantum dots functionalized with tetrapyridyl-substituted porphyrin, a cation-selective carrier. It is shown that the porphyrin ion carrier coordinates to Cd atoms of the CdSe quantum dots through the Lewis basic pyridyl groups. The porphyrin-quantum dot ligation allows for the direct communication between the porphyrin and the underlying CdSe quantum structure. The quantum yield of CdSe is maintained despite the robust capping generated when the unmetallated porphyrins coordinate onto the quantum dots. Upon coordination with zinc ions, this porphyrin capping is shown to strongly contribute to the increase in the fluorescence efficiency of CdSe, via an activating interaction with the quantum dots surface. The results provide the grounds for the development of highly sensitive and selective nano-optode sensing systems.

Item Type:Article
Subjects:Material Science > Nanostructured materials
ID Code:8881
Deposited By:CSMNT
Deposited On:25 Aug 2010 09:55
Last Modified:25 Aug 2010 09:55

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