Optical and Magnetic Properties of Conjugate Structures of PbSe Quantum Dots and γ‐Fe2O3 Nanoparticles |
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| Authors: | Lioz Etgar Gregory Leitus Dr Leonid Fradkin Dr Yehuda G Assaraf Prof Rina Tannenbaum Prof Efrat Lifshitz Prof |
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| Institution: | 1. Nanoscience and Nanotechnology Program, Technion, Haifa 32000 (Israel);2. Chemical Research Support Department, Weizmann Institute of Science, Rehovot 76100 (Israel);3. Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Technion, Haifa 32000 (Israel), Fax: (+972)?48235107;4. Center for Nano‐ and Molecular Science and Technology, The University of Texas at Austin (USA);5. The Fred Wyszkowski Cancer Research Laboratory, Department of Biology, Technion, Haifa 32000 (Israel);6. Department of Chemical Engineering, Technion, Haifa 32000 (Israel), Fax: (+972)?48292850;7. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332(USA) |
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| 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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| Keywords: | conjugation hydrogen bonds magnetic properties nanoparticles quantum dots |
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