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

作者：Federspiel Francois; Froehlicher Guillaume; Nasilowski Michel; Pedetti Silvia; Mahmood Ather; Doudin Bernard; Park Serin; Lee Jeong O; Halley David; Dubertret Benoit; Gilliot Pierre; Berciaud Stephane^*

来源：Nano Letters, 2015, 15(2): 1252-1258.

DOI：10.1021/nl5044192

• Graphene
• semiconductor nanocrystals
• quantum dots
• semiconductor nanoplatelets
• quantum wells
• resonant energy transfer
• FRET
• single molecule luminescence
• heterostructures
• dimensionality

The near-field Coulomb interaction between a nanoemitter and a graphene monolayer results in strong Forster-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.

• 出版日期2015-2