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Anion sensing with luminescent quantum dots - A modular approach based on the photoinduced electron transfer (PET) mechanism

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Callan, John F., Mulrooney, Ray C., Kamila, Sukanta and McCaughan, Bridgeen (2008) Anion sensing with luminescent quantum dots - A modular approach based on the photoinduced electron transfer (PET) mechanism. JOURNAL OF FLUORESCENCE, 18 (2). pp. 527-532. [Journal article]

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DOI: 10.1007/s10895-007-0295-9

Abstract

A CdSe-ZnS quantum dot (QD) has been surface functionalised with 1-(2-mercapto-ethyl)-3-phenyl-thiourea in the fluorophore-spacer-receptor format typical of Photoinduced Electron Transfer (PET) based organic dye sensors. The resulting QD conjugate was tested for selectivity toward the tetrabutylammonium salts of fluoride, chloride, bromide, hydrogen sulfate and acetate. Addition of fluoride, chloride and acetate ions resulted in an approximate 90% quenching of the original fluorescence intensity, while bromide and hydrogen sulfate had almost no effect. The observed quench was attributed to an increase in the reduction potential of the receptor upon anion binding resulting in an increase in PET from the excited QD to the receptor and a concomitant reduction in fluorescence intensity. The selectivity and sensitivity were comparable to an analagous organic dye based sensor where a similar receptor was bound to an anthracene fluorophore. Thus a modular approach is evident where a receptor used in an organic dye based sensor can be adapted and successfully used with QD's.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Pharmacy and Pharmaceutical Science
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Pharmaceutical Science and Practice
ID Code:4068
Deposited By:Professor John Callan
Deposited On:05 Jan 2010 14:09
Last Modified:19 Nov 2012 15:24

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