Optical and magnetic properties of conjugate structures of PbSe quantum dots and γ-Fe2O3 nanoparticles

Lioz Etgar; Gregory Leitus; Leonid Fradkin; Yehuda G. Assaraf; Rina Tannenbaum; Efrat Lifshitz

doi:10.1002/cphc.200900345

Optical and magnetic properties of conjugate structures of PbSe quantum dots and γ-Fe₂O₃ nanoparticles

Lioz Etgar, Gregory Leitus, Leonid Fradkin, Yehuda G. Assaraf, Rina Tannenbaum^*, Efrat Lifshitz

^*Corresponding author for this work

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

11 Scopus citations

Abstract

An investigation of the optical and magnetic properties of a unique hydrogen-linked conjugate nanostructure, comprised of superparamagnetic γ-Fe₂O₃ nanoparticles (NPs) and near-infrared PbSe nanocrystal quantum dot (NQD) chromophores, is reported. The results show retention of the NQDs' emission quantum efficiency and radiative lifetime, and only a small red shift of its band energy, upon conjugation to the dielectric surroundings of γ-Fe₂O₃ NPs. The study also shows the sustainability of the superparamagnetism of the NPs after conjugation, with only a slight decrease of the ferromagnetic-superparamagnetic transition temperature with respect to that of the individual NPs. Thus, the conjugate nanostructure can be considered as a useful medical platform when PbSe NQDs act as fluorescent tags, while the γ-Fe₂O₃ NPs are used as a vehicle driven by an external magnetic field for targeted delivery of tags or drugs.

Original language	English
Pages (from-to)	2235-2241
Number of pages	7
Journal	ChemPhysChem
Volume	10
Issue number	13
DOIs	https://doi.org/10.1002/cphc.200900345
State	Published - 14 Sep 2009
Externally published	Yes

Keywords

Conjugation
Hydrogen bonds
Magnetic properties
Nanoparticles
Quantum dots

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/cphc.200900345

Cite this

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title = "Optical and magnetic properties of conjugate structures of PbSe quantum dots and γ-Fe2O3 nanoparticles",

abstract = "An investigation of the optical and magnetic properties of a unique hydrogen-linked conjugate nanostructure, comprised of superparamagnetic γ-Fe2O3 nanoparticles (NPs) and near-infrared PbSe nanocrystal quantum dot (NQD) chromophores, is reported. The results show retention of the NQDs' emission quantum efficiency and radiative lifetime, and only a small red shift of its band energy, upon conjugation to the dielectric surroundings of γ-Fe2O3 NPs. The study also shows the sustainability of the superparamagnetism of the NPs after conjugation, with only a slight decrease of the ferromagnetic-superparamagnetic transition temperature with respect to that of the individual NPs. Thus, the conjugate nanostructure can be considered as a useful medical platform when PbSe NQDs act as fluorescent tags, while the γ-Fe2O3 NPs are used as a vehicle driven by an external magnetic field for targeted delivery of tags or drugs.",

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AU - Leitus, Gregory

AU - Fradkin, Leonid

AU - Assaraf, Yehuda G.

AU - Tannenbaum, Rina

AU - Lifshitz, Efrat

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AB - An investigation of the optical and magnetic properties of a unique hydrogen-linked conjugate nanostructure, comprised of superparamagnetic γ-Fe2O3 nanoparticles (NPs) and near-infrared PbSe nanocrystal quantum dot (NQD) chromophores, is reported. The results show retention of the NQDs' emission quantum efficiency and radiative lifetime, and only a small red shift of its band energy, upon conjugation to the dielectric surroundings of γ-Fe2O3 NPs. The study also shows the sustainability of the superparamagnetism of the NPs after conjugation, with only a slight decrease of the ferromagnetic-superparamagnetic transition temperature with respect to that of the individual NPs. Thus, the conjugate nanostructure can be considered as a useful medical platform when PbSe NQDs act as fluorescent tags, while the γ-Fe2O3 NPs are used as a vehicle driven by an external magnetic field for targeted delivery of tags or drugs.

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