Metal ion induced fluorescence resonance energy transfer between crown ether functionalized quantum dots and rhodamine B: Selectivity of K+ ion
- Citation:
- Lee, H-L, Dhenadhayalan N, Lin K-C. 2015. Metal ion induced fluorescence resonance energy transfer between crown ether functionalized quantum dots and rhodamine B: Selectivity of K+ ion. RSC Advances. 5:4926-4933., Number 7
Abstract:
We report a ratiometric fluorescent metal ion sensor based on the mechanism of fluorescence resonance energy transfer (FRET) between synthesized 15-crown-5-ether capped CdSe/ZnS quantum dots (QDCE) and 15-crown-5-ether attached rhodamine B (RBCE) in pH 8.3 buffer solution. Fluorescence titration with different metal ions in pH 8.3 buffer solution of the QDCE-RBCE conjugate showed a decrease and an increase in the fluorescence intensity for QDCE and RBCE moieties respectively due to FRET from QDCE to RBCE. This sensor system shows excellent selectivity towards K+ ions resulting in increasing efficiency of FRET. Energy transfer efficiency depends on the affinity between metal ions and crown ether functionalized with QDCE/RBCE. The detailed analysis of FRET was explored. This water soluble ratiometric sensor system can act as a good FRET probe for sensing applications especially in biological systems. © The Royal Society of Chemistry 2015.
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