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Distance Dependence of the Energy Transfer Rate from a Single Semiconductor Nanostructure to Graphene

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journal contribution
posted on 2015-02-11, 00:00 authored by François Federspiel, Guillaume Froehlicher, Michel Nasilowski, Silvia Pedetti, Ather Mahmood, Bernard Doudin, Serin Park, Jeong-O Lee, David Halley, Benoît Dubertret, Pierre Gilliot, Stéphane Berciaud
The near-field Coulomb interaction between a nanoemitter and a graphene monolayer results in strong Förster-type resonant energy transfer and subsequent fluorescence quenching. Here, we investigate the distance dependence of the energy transfer rate from individual, (i) zero-dimensional CdSe/CdS nanocrystals and (ii) two-dimensional CdSe/CdS/ZnS nanoplatelets to a graphene monolayer. For increasing distances d, the energy transfer rate from individual nanocrystals to graphene decays as 1/d4. In contrast, the distance dependence of the energy transfer rate from a two-dimensional nanoplatelet to graphene deviates from a simple power law but is well described by a theoretical model, which considers a thermal distribution of free excitons in a two-dimensional quantum well. Our results show that accurate distance measurements can be performed at the single particle level using graphene-based molecular rulers and that energy transfer allows probing dimensionality effects at the nanoscale.