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Emission variation in CdSe/ZnS quantum dots conjugated to Papilloma virus antibodies

Published online by Cambridge University Press:  19 November 2013

Juan A. Jaramillo Gómez ,
Tetyana V. Torchynska ,
Jose L. Casas Espinola  and
Janna Douda
Juan A. Jaramillo Gómez
Affiliation:
UPIITA – Instituto Politécnico Nacional, México D. F. 07340, México
Tetyana V. Torchynska
Affiliation:
ESFM – Instituto Politécnico Nacional, México D. F. 07738, México
Jose L. Casas Espinola
Affiliation:
ESFM – Instituto Politécnico Nacional, México D. F. 07738, México
Janna Douda
Affiliation:
UPIITA – Instituto Politécnico Nacional, México D. F. 07340, México
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Abstract

The paper presents a comparative study of the photoluminescence (PL) and Raman scattering spectra of core-shell CdSe/ZnS quantum dots (QDs) in nonconjugated states and after the conjugation to the anti-human papilloma virus (HPV), HPV 16-E7, antibodies. All optical measurements are performed on the dried droplets of the original solution of nonconjugated and bioconjugated QDs located on the Si substrate. CdSe/ZnS QDs with emission at 655 nm have been used. PL spectra of nonconjugated QDs are characterized by one Gaussian shape PL band related to the exciton emission in the CdSe core. PL spectra of bioconjugated QDs have changed essentially: the core PL band shifts into the high energy spectral range (“blue” sift) and becomes asymmetric. A set of physical reasons has been proposed for the “blue” shift explanation of the core PL band in bioconjugated QDs. The variation of PL spectra versus excitation light intensities has been studied to analyses the exciton emission via excited states in QDs. Finally the PL spectrum transformation for the core emission in bioconjugated QDs has been attributed to the electronic quantum confined effects stimulated by the electric charges of bioconjugated antibodies.

Keywords

luminescencecolloidal particlesCdSe/ZnS
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1617: Symposium 7E – Low-Dimensional Semiconductor Structures , 2013 , pp. 139 - 144
Copyright
Copyright © Materials Research Society 2013 

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