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Two-Photon Oxygen Sensing with Quantum Dot-Porphyrin Conjugates

Author(s)
Lemon, Christopher M.; Karnas, Elizabeth; Bawendi, Moungi G.; Nocera, Daniel G.
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Abstract
Supramolecular assemblies of a quantum dot (QD) associated to palladium(II) porphyrins have been developed to detect oxygen (pO[subscript 2]) in organic solvents. Palladium porphyrins are sensitive in the 0–160 Torr range, making them ideal phosphors for in vivo biological oxygen quantification. Porphyrins with meso pyridyl substituents bind to the surface of the QD to produce self-assembled nanosensors. Appreciable overlap between QD emission and porphyrin absorption features results in efficient Forster resonance energy transfer (FRET) for signal transduction in these sensors. The QD serves as a photon antenna, enhancing porphyrin emission under both one- and two-photon excitation, demonstrating that QD-palladium porphyrin conjugates may be used for oxygen sensing over physiological oxygen ranges.
Date issued
2013-08
URI
http://hdl.handle.net/1721.1/93246
Department
Massachusetts Institute of Technology. Department of Chemistry
Journal
Inorganic Chemistry
Publisher
American Chemical Society (ACS)
Citation
Lemon, Christopher M., Elizabeth Karnas, Moungi G. Bawendi, and Daniel G. Nocera. “Two-Photon Oxygen Sensing with Quantum Dot-Porphyrin Conjugates.” Inorg. Chem. 52, no. 18 (September 16, 2013): 10394–10406.
Version: Author's final manuscript
ISSN
0020-1669
1520-510X

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