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Synthesis and characterization of free base and metal porphyrins and their interaction with CdTe QDs

Paper ID Volume ID Publish Year Pages File Format Full-Text
26697 43971 2014 9 PDF Available
Title
Synthesis and characterization of free base and metal porphyrins and their interaction with CdTe QDs
Abstract

•The binding interaction of QDs with porphyrins having different number of methoxy groups and their electron transfer feasibilities was studied.•The insertion of metal increases the binding affinity with QDs as compared to free base porphyrins.•Porphyrin anion radical was observed in transient absorption measurements which reveal the electron transfer from QDs to porphyrin.•The overall results will provide prolific information for the future modification of quantum dot solar cells.

Free base porphyrins and metalloporphyrins with different number of methoxy groups were synthesized to investigate the consequence of methoxy groups in the porphyrins on interaction with quantum dots through steady state, time resolved and transient absorption measurements. Spectral changes in the absorption and photoluminescence of quantum dots in the presence of porphyrins elucidate the binding affinity between them. From the photoluminescence quenching analysis, higher number of methoxy substituted zinc porphyrin was found to possess better binding affinity with quantum dots than the other porphyrins which divulges the role of methoxy substituents. The calculated reduction potential of the synthesized porphyrins was feasible for accepting electrons from the photoexcited quantum dots. Electron transfer mechanism is suggested based on energy level diagram, Rehm–Weller equation and transient absorption measurements.

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Keywords
Quantum dots; Free base porphyrins; Metalloporphyrins; Electron transfer; Transient absorption measurements; Photoluminescence quenching
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Synthesis and characterization of free base and metal porphyrins and their interaction with CdTe QDs
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 276, 15 February 2014, Pages 104–112
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us