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 journalArticlepeer-review

11 Scopus citations


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 languageAmerican English
Pages (from-to)2235-2241
Number of pages7
Issue number13
StatePublished - 14 Sep 2009
Externally publishedYes


  • Conjugation
  • Hydrogen bonds
  • Magnetic properties
  • Nanoparticles
  • Quantum dots


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