Journal
NANO LETTERS
Volume 19, Issue 6, Pages 3886-3891Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b01071
Keywords
Membrane sensing; carbon dots; lipid bilayer membranes; trans-membrane energy transfer; ionic interactions
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Funding
- ERC through the Advanced Investigator Grant HYMEM
- DFG [SFB 1032]
- Bayerisches Hochschulzentrum Lateinamerika through BAYLAT
- ANPCyT [PICT 2016-0679]
- CONICET
- UNLP
- Alexander von Humboldt-Foundation
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We report on trans-membrane interactions between blue-emitting carbon dots (CDs) and fluorescein. Hydrophobic CDs with a positive surface charge are embedded as-synthesized in the lipophilic sheet of the bilayer membrane of large synthetic phospholipid vesicles. The vesicles are prepared by mixing DOPC phospholipids and lipid molecules that contain anionic fluorescein attached to their hydrophilic head. Due to attractive electrostatic interactions, the CDs and fluorescein conjoin within the vesicle membrane, which leads to photoluminescence enhancement of fluorescein and facilitates trans-membrane energy transfer between the CDs and the dye.
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