Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 49, Issue 31, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/49/31/315102
Keywords
graphene; nonradiative energy transfer; FLIM; composite structures; time correlated single photon counting
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Funding
- FEDER through the COMPETE Program
- Portuguese Foundation for Science and Technology (FCT) [PEST-C/FIS/UI607/2011, PTDC/FIS/101434/2008]
- Spain's MINECO [FIS2014-57432-P]
- Comunidad de Madrid [S2013/MIT-3007 MAD2D-CM]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/101434/2008] Funding Source: FCT
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In this work we quantify the distance dependence for the extraction of energy from excited chromophores by a single layer graphene flake over a large separation range. To this end hybrid structures were prepared, consisting of a thin (2 nm) layer of a polymer matrix doped with a well chosen strongly fluorescent organic molecule, followed by an un-doped spacer layer of well-defined thicknesses made of the same polymer material and an underlying single layer of pristine, undoped graphene. The coupling strength is assessed through the variation of the fluorescence decay kinetics as a function of distance between the graphene and the excited chromophore molecules. Non-radiative energy transfer to the graphene was observed at distances of up to 60 nm; a range much greater than typical energy transfer distances observed in molecular systems.
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