Journal
NANO LETTERS
Volume 16, Issue 9, Pages 5737-5741Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02430
Keywords
Graphene; fluorescence quenching; pi-pi stacking; electrons transfer; Raman mapping; Dirac-point shift
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Funding
- National Natural Science Foundation of China [11335006]
- Fok Ying Tung Education Foundation
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Intermolecular p-orbital overlaps in unsaturated pi-conjugated systems, such as graphene and fluorescent molecules with aromatic structure, serve as the electron-exchanged path. Using Raman-mapping measurements, we observe that the fluorescence intensity of fluorescein isothiocyanate (FITC) is quenched by graphene, whereas it persists in graphene-absent substrates (SiO2). After identifying a mechanism related to photon-induced electron transfer (PET) that contributes to this fluorescence quenching phenomenon, we validate this mechanism by Conducting analyses on Dirac point shifts of FITC-coated graphene. From these shifts, Fermi level elevation and the electron-concentration surge in graphene upon visible-light impingements are acquired. Finally, according to this mechanism, graphene-based biosensors are fabricated to show the sensing capability of measuring fluorescently labeled-biomolecule concentrations.
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