Impact of Antibody Bioconjugation on Emission and Energy Band Profile of CdSeTe/ZnS Quantum Dots

The variation of the photoluminescence (PL) and Raman scattering spectra of CdSeTe/ZnS quantum dots (QDs) on conjugation to an antibody has been investigated. Two types of CdSeTe/ZnS QD with different emission wavelength (705 nm and 800 nm) were studied comparatively before and after conjugation to...

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Bibliographic Details
Published in:Journal of electronic materials 2018-08, Vol.47 (8), p.4254-4259
Main Authors: Torchynska, T. V., Gomez, J. A. Jaramillo, Polupan, G., Macotela, L. G. Vega
Format: Article
Language:English
Subjects:
18th International Conference on II-VI Compounds and Related Materials
Biosensors
Characterization and Evaluation of Materials
Chemistry and Materials Science
Conjugation
Electric dipoles
Electronics and Microelectronics
Emission analysis
Instrumentation
Materials research
Materials Science
Mathematical analysis
Mathematical models
Optical and Electronic Materials
Photoluminescence
Quantum dots
Quantum wells
Raman spectra
Solid State Physics
Topical Collection: 18th International Conference on II-VI Compounds
Viruses
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Summary:The variation of the photoluminescence (PL) and Raman scattering spectra of CdSeTe/ZnS quantum dots (QDs) on conjugation to an antibody has been investigated. Two types of CdSeTe/ZnS QD with different emission wavelength (705 nm and 800 nm) were studied comparatively before and after conjugation to anti-pseudorabies virus antibody (AB). Nonconjugated QDs were characterized by Gaussian-type PL bands. PL shifts to higher energy and asymmetric shape of PL bands was detected in PL spectra of bioconjugated QDs. The surface-enhanced Raman scattering effect was exhibited by the bioconjugated CdSeTe/ZnS QDs, indicating that the excitation light used in the Raman study generated electric dipoles in the AB molecules. The optical bandgap of the CdSeTe core was calculated numerically as a function of its radius based on an effective mass approximation model. The energy band diagrams for non- and bioconjugated CdSeTe/ZnS QDs were obtained, revealing a type II quantum well in the CdSeTe core. The calculations show that AB dipoles, excited in the bioconjugated QDs, stimulate a change in the energy band diagram of the QDs that alters the PL spectrum. These results could be useful for improving the sensitivity of QD biosensors.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-018-6168-y