Related Experiment Video
Updated: May 8, 2026

Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems
Published on: March 3, 2010
Two-photon oxygen sensing with quantum dot-porphyrin conjugates.
Christopher M Lemon1, Elizabeth Karnas, Moungi G Bawendi
1Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Researchers developed novel nanosensors by linking quantum dots (QDs) with palladium porphyrins for precise oxygen detection. These sensors are ideal for biological applications, enabling oxygen quantification within physiological ranges.
Area of Science:
- Materials Science
- Biomedical Engineering
- Analytical Chemistry
Background:
- Palladium porphyrins are sensitive phosphors for oxygen quantification.
- Quantum dots (QDs) offer unique optical properties for signal enhancement.
Purpose of the Study:
- To develop self-assembled nanosensors for oxygen detection in organic solvents.
- To utilize Förster resonance energy transfer (FRET) for signal transduction.
- To enable oxygen sensing within physiological ranges.
Main Methods:
- Creating supramolecular assemblies of QDs and palladium(II) porphyrins.
- Utilizing porphyrins with meso pyridyl substituents for QD surface binding.
- Investigating QD emission and porphyrin absorption overlap for FRET efficiency.
- Employing one- and two-photon excitation for enhanced porphyrin emission.
Main Results:
- Successful development of QD-palladium porphyrin nanosensors.
- Demonstration of efficient FRET between QDs and porphyrins.
- Quantum dots enhance porphyrin emission, acting as photon antennas.
- Sensors show sensitivity in the 0-160 Torr oxygen range.
Conclusions:
- QD-palladium porphyrin conjugates are effective for oxygen sensing.
- The developed nanosensors are suitable for biological oxygen quantification.
- This approach offers enhanced signal transduction via FRET and QD antenna effect.
Related Concept Videos
Photoluminescence: Applications
Fluorescence and Phosphorescence: Instrumentation
UV–Vis Spectroscopy of Conjugated Systems
One of the factors influencing λmax is the extent of conjugation in the...

