Graphene as a Reversible and Spectrally Selective Fluorescence Quencher

Date
2016
Authors
Salihoglu, O.
Kakenov, N.
Balci, O.
Balci, S.
Kocabas, C.
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Source Title
Scientific Reports
Print ISSN
2045-2322
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Publisher
Nature Publishing Group
Volume
6
Issue
Pages
1 - 7
Language
English
Type
Article
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Abstract

We report reversible and spectrally selective fluorescence quenching of quantum dots (QDs) placed in close proximity to graphene. Controlling interband electronic transitions of graphene via electrostatic gating greatly modifies the fluorescence lifetime and intensity of nearby QDs via blocking of the nonradiative energy transfer between QDs and graphene. Using ionic liquid (IL) based electrolyte gating, we are able to control Fermi energy of graphene in the order of 1 eV, which yields electrically controllable fluorescence quenching of QDs in the visible spectrum. Indeed, our technique enables us to perform voltage controllable spectral selectivity among quantum dots at different emission wavelengths. We anticipate that our technique will provide tunable light-matter interaction and energy transfer that could yield hybrid QDs-graphene based optoelectronic devices with novel functionalities, and additionally, may be useful as a spectroscopic ruler, for example, in bioimaging and biomolecular sensing. We propose that graphene can be used as an electrically tunable and wavelength selective fluorescence quencher. � 2016 The Author(s).

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