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Photoluminescence transformation of core/shell CdSe/ZnS quantum dots at the conjugation to biomolecules

Published online by Cambridge University Press:  19 March 2012

T. V. Torchynska ,
I. Ch. Ballardo Rodríguez  and
Ye. Shcherbyna
T. V. Torchynska
Affiliation:
ESFM – Instituto Politécnico Nacional, México D. F. 07738, México,
I. Ch. Ballardo Rodríguez
Affiliation:
UPIITA- Instituto Politécnico Nacional, México D. F. 07738, México,
Ye. Shcherbyna
Affiliation:
National Technical University – “KPI”, Kiev, 03056, Ukraine
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Abstract

The paper presents the results of PL spectrum analysis of CdSe/ZnS QDs covered by PEG polymer with and without bioconjugation to bio-molecules .– the Osteopontin antibodies. Commercial CdSe/ZnS QDs used in the study are characterized by the color emission with the maximum at 640 nm (1.96 eV) at 300K. It is shown that PL spectra of nonconjugated QDs can be presented as a superposition of PL bands related to exciton emission in the CdSe core (1.96 eV) and some high energy PL bands (in the spectral range 2.37 .– 3.00 eV). The comparative study of PL spectrum at high (300K) and low (10K) temperatures has testified that high energy PL bands deal with electronhole emission via interface states at the CdSe/ZnS/polymer interfaces.

It is revealed that the QD bioconjugation to the anti Osteopontin antibody is accompanied by the change dramatically in PL spectra. Main features of PL spectrum transformstions deal with decreasing the PL intensity of interface related PL bands and the rise of intensity of CdSe core related PL bands. The explanation of mentioned effects has been proposed on the base of re-charging of interface related states at the bioconjugation process.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1376: Symposium S11 – Biomaterials for Medical Applications , 2012 , imrc11-1376-s11-o22
Copyright
Copyright © Materials Research Society 2012

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