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Photonic Crystal Fiber for Efficient Raman Scattering of Thiol-Capped Quantum Dots in Aqueous Solution

Published online by Cambridge University Press:  11 July 2011

Jacky S. W. Mak ,
Abdiaziz A. Farah ,
Feifan Chen  and
Amr S. Helmy
Jacky S. W. Mak
Affiliation:
The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario, M5S 3G4 Canada
Abdiaziz A. Farah
Affiliation:
The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario, M5S 3G4 Canada
Feifan Chen
Affiliation:
The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario, M5S 3G4 Canada
Amr S. Helmy
Affiliation:
The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario, M5S 3G4 Canada
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Abstract

A novel hollow-core photonic crystal fiber platform was used for the first time to observe clear vibrational modes of the CdTe core, CdS0.7Te0.3 interface, and carboxylate-metal complexes in dilute aqueous CdTe quantum dot (QD) solutions. These modes demonstrate the presence of crystalline cores, defects and surface passivation responsible for photoluminescent efficiency and stability. In addition, 3-mercaptopropionic acid (MPA)-capped QDs show higher crystallinity and stability than those capped with thioglycolic acid (TGA) and 1-thioglycerol (TG). This detailed, non-destructive characterization was carried out using Raman spectroscopy for solutions with QD concentration of 2 mg/mL, which is similar to their concentration during synthesis process. This platform can be extended to the in-situ studies of any colloidal nanoparticles and aqueous solutions of relevant biological samples using Raman spectroscopy.

Keywords

sensorRaman spectroscopynanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1346: Symposium AA – Micro- and Nanofluidic Systems for Materials Synthesis, Device Assembly and Bioanalysis , 2011 , mrss11-1346-aa02-03
Copyright
Copyright © Materials Research Society 2011

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References

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