Modification of optical properties at bioconjugation of core-shell CdSe/ZnS quantum dots

T. V. Torchynska; A. L. Quintos Vazquez; R. Pẽa Sierra; K. Gazarian; L. Shcherbyna

doi:10.1088/1742-6596/245/1/012013

Modification of optical properties at bioconjugation of core-shell CdSe/ZnS quantum dots

T. V. Torchynska, A. L. Quintos Vazquez, R. Pẽa Sierra, K. Gazarian, L. Shcherbyna

Escuela Superior de Física y Matemáticas (ESFM)

Research output: Contribution to journal › Article › peer-review

Abstract

This paper presents the results of photoluminescence study of core-shell CdSe/ZnS quantum dots (QDs) with radiative interface states in nonconjugated and bioconjugated conditions. PL spectra of nonconjugated QDs are characterized by a superposition of PL bands related to exciton emission in CdSe cores (2.36 eV) and to electron-hole emission via interface states (2.00, 2.75 and 3.04 eV) at the CdSe/ZnS or ZnS/polymer interfaces. The CdSe/ZnS QDs with emission at 525 nm have been conjugated with bio-molecules - mouse ovarian cancer (OC 125) antibodies. It is revealed that PL spectrum of bioconjugated QDs has changed dramatically with essential decreasing of the hot electron-hole recombination flow via interface states. This effect is explained on the base of the model deals with re-charging of QD interface states at the bioconjugation with OC125 antibodies. The nature of interface states and their changes at the QD aging process have been discussed as well.

Translated title of the contribution	Modificación de las propiedades ópticas en la bioconjugación de puntos cuánticos core-shell CdSe/ZnS
Original language	English
Article number	012013
Journal	Journal of Physics: Conference Series
Volume	244
DOIs	https://doi.org/10.1088/1742-6596/245/1/012013
State	Published - 2010

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title = "Modification of optical properties at bioconjugation of core-shell CdSe/ZnS quantum dots",

abstract = "This paper presents the results of photoluminescence study of core-shell CdSe/ZnS quantum dots (QDs) with radiative interface states in nonconjugated and bioconjugated conditions. PL spectra of nonconjugated QDs are characterized by a superposition of PL bands related to exciton emission in CdSe cores (2.36 eV) and to electron-hole emission via interface states (2.00, 2.75 and 3.04 eV) at the CdSe/ZnS or ZnS/polymer interfaces. The CdSe/ZnS QDs with emission at 525 nm have been conjugated with bio-molecules - mouse ovarian cancer (OC 125) antibodies. It is revealed that PL spectrum of bioconjugated QDs has changed dramatically with essential decreasing of the hot electron-hole recombination flow via interface states. This effect is explained on the base of the model deals with re-charging of QD interface states at the bioconjugation with OC125 antibodies. The nature of interface states and their changes at the QD aging process have been discussed as well.",

author = "Torchynska, {T. V.} and {Quintos Vazquez}, {A. L.} and {Pẽa Sierra}, R. and K. Gazarian and L. Shcherbyna",

year = "2010",

doi = "10.1088/1742-6596/245/1/012013",

language = "Ingl{\'e}s",

volume = "244",

journal = "Journal of Physics: Conference Series",

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T1 - Modification of optical properties at bioconjugation of core-shell CdSe/ZnS quantum dots

AU - Torchynska, T. V.

AU - Quintos Vazquez, A. L.

AU - Pẽa Sierra, R.

AU - Gazarian, K.

AU - Shcherbyna, L.

PY - 2010

Y1 - 2010

N2 - This paper presents the results of photoluminescence study of core-shell CdSe/ZnS quantum dots (QDs) with radiative interface states in nonconjugated and bioconjugated conditions. PL spectra of nonconjugated QDs are characterized by a superposition of PL bands related to exciton emission in CdSe cores (2.36 eV) and to electron-hole emission via interface states (2.00, 2.75 and 3.04 eV) at the CdSe/ZnS or ZnS/polymer interfaces. The CdSe/ZnS QDs with emission at 525 nm have been conjugated with bio-molecules - mouse ovarian cancer (OC 125) antibodies. It is revealed that PL spectrum of bioconjugated QDs has changed dramatically with essential decreasing of the hot electron-hole recombination flow via interface states. This effect is explained on the base of the model deals with re-charging of QD interface states at the bioconjugation with OC125 antibodies. The nature of interface states and their changes at the QD aging process have been discussed as well.

AB - This paper presents the results of photoluminescence study of core-shell CdSe/ZnS quantum dots (QDs) with radiative interface states in nonconjugated and bioconjugated conditions. PL spectra of nonconjugated QDs are characterized by a superposition of PL bands related to exciton emission in CdSe cores (2.36 eV) and to electron-hole emission via interface states (2.00, 2.75 and 3.04 eV) at the CdSe/ZnS or ZnS/polymer interfaces. The CdSe/ZnS QDs with emission at 525 nm have been conjugated with bio-molecules - mouse ovarian cancer (OC 125) antibodies. It is revealed that PL spectrum of bioconjugated QDs has changed dramatically with essential decreasing of the hot electron-hole recombination flow via interface states. This effect is explained on the base of the model deals with re-charging of QD interface states at the bioconjugation with OC125 antibodies. The nature of interface states and their changes at the QD aging process have been discussed as well.

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U2 - 10.1088/1742-6596/245/1/012013

DO - 10.1088/1742-6596/245/1/012013

M3 - Artículo

AN - SCOPUS:78651235960

SN - 1742-6588

VL - 244

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

M1 - 012013

ER -

Modification of optical properties at bioconjugation of core-shell CdSe/ZnS quantum dots

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