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Accueil du site > Vie du laboratoire > Congrès / Colloques / Conférences > Optical Properties of Individual Nanowires and Quantum Dots in High Magnetic Field, Septembre 2014 > Programme du workshop > Abstract : Paramagnetic, fluorescent Mn-doped PbS colloidal nanocrystals

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Abstract : Paramagnetic, fluorescent Mn-doped PbS colloidal nanocrystals

L. Turyanskaa, F. Moroa, A. N. Knotta, M. W. Faya, T.D. Bradshawa, H. Faasa, R.J.A. Hill, N.R. Thomasa, P. Clarkea, A. Meaneyb, P.C.M. Christianenb, M. Lic, S. Mannc, A. Patanèa

a, School of Physics and Astronomy, School of Chemistry, School of Pharmacy, School of Medicine, Nottingham Nanotechnology and Nanoscience Centre, The University of Nottingham, Nottingham NG7 2RD, UK.

b. HFML, Radboud University, Nijmegen 6525 ED, The Netherlands.

c. School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.

 

We report on colloidal PbS nanocrystals [1-5] that combine within one structure solubility in physiological solvents with magnetic and optical properties tunable by the concentration of manganese (Mn) atoms. We use high magnetic fields (B up to 30 T) to measure the magnetization of the nanocrystals in liquid, the strength of the sp-d exchange interaction between the exciton and the Mn-ions, and the electron spin dynamics.

Tunable fluorescence, paramagnetism, exciton g-factor and spin-dynamics are relevant to the implementation of the nanocrystals in technologies that exploit the spin of the electron and of the paramagnetic ions. We demonstrate coherent manipulation of the electron spin and quantum Rabi oscillations by electron spin resonance in nanocrystals containing isolated Mn-ions ; also, dual functionality, i.e. NIR luminescence and paramagnetism, combined with the biocompatibility and functionalization of the nanocrystals by encapsulation in the apoferritin protein, offer prospects for the use of the nanoparticles as labels for fluorescence and magnetic resonance imaging.

 

References

1. B. Hennequin et al. Adv. Mat. 2008, 20, 3592.

2. L. Turyanska et al. Small 2009, 5 1738.

3. L. Turyanska et al. Part. Part. Syst. Characterization 2013, 30 945.

4. L. Turyanska et al. Nanoscale 2014, DOI : 10.1039/c4nr02336f

5. T. D Bradshaw et al. J. Mater. Chem. 2013, 1, 6254.