DOI: 10.1002/cphc.200800317. Characterisation of Nanohybrids of Porphyrins with Metallic and Semiconducting Carbon Nanotubes by EPR and Optical Spectroscopy

Characterisation of Nanohybrids of Porphyrins with Metallic and Semiconducting Carbon Nanotubes by EPR and Optical Spectroscopy

10.1002/cphc.200800317

Crossref journal-article

Wiley

ChemPhysChem (311)

Abstract

AbstractSingle‐walled carbon nanotubes (SWCNTs) are noncovalently functionalised with octaethylporphyrins (OEPs) and the resulting nanohybrids are isolated from the free OEPs. Electron paramagnetic resonance (EPR) spectroscopy of cobalt(II)OEP, adsorbed on the nanotube walls by π–π‐stacking, demonstrates that the CNTs act as electron acceptors. EPR is shown to be very effective in resolving the different interactions for metallic and semiconducting tubes. Moreover, molecular oxygen is shown to bind selectively to nanohybrids with semiconducting tubes. Water solubilisation of the porphyrin/CNT nanohybrids using bile salts, after applying a thorough washing procedure, yields solutions in which at least 99 % of the porphyrins are interacting with the CNTs. Due to this purification, we observe, for the first time, the isolated absorption spectrum of the interacting porphyrins, which is strongly red‐shifted compared to the free porphyrin absorption. In addition a quasi‐complete quenching of the porphyrin fluorescence is also observed.

Bibliography

CambrÃ©, S., Wenseleers, W., Äulin, J., Van Doorslaer, S., Fonseca, A., Nagy, J. B., & Goovaerts, E. (2008). Characterisation of Nanohybrids of Porphyrins with Metallic and Semiconducting Carbon Nanotubes by EPR and Optical Spectroscopy. ChemPhysChem, 9(13), 1930â1941. Portico.

Authors 7

Sofie Cambré (first)
Wim Wenseleers (additional)
Jelena Čulin (additional)
Sabine Van Doorslaer (additional)
Antonio Fonseca (additional)
Janos B. Nagy (additional)
Etienne Goovaerts (additional)

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For comparison we also checked the protonation effects on these samples by adding small amounts of HCl to reference samplesR2andR4confirming the same effects.

Dates

Type	When
Created	17 years ago (Aug. 19, 2008, 8:59 a.m.)
Deposited	1 year, 10 months ago (Oct. 11, 2023, 2:46 a.m.)
Indexed	2 days, 6 hours ago (Sept. 2, 2025, 6:40 a.m.)
Issued	16 years, 11 months ago (Sept. 9, 2008)
Published	16 years, 11 months ago (Sept. 9, 2008)
Published Online	16 years, 11 months ago (Sept. 9, 2008)
Published Print	16 years, 11 months ago (Sept. 15, 2008)

Funders 0

None

BibTeX

@article{Cambr__2008, title={Characterisation of Nanohybrids of Porphyrins with Metallic and Semiconducting Carbon Nanotubes by EPR and Optical Spectroscopy}, volume={9}, ISSN={1439-7641}, url={http://dx.doi.org/10.1002/cphc.200800317}, DOI={10.1002/cphc.200800317}, number={13}, journal={ChemPhysChem}, publisher={Wiley}, author={Cambré, Sofie and Wenseleers, Wim and Čulin, Jelena and Van Doorslaer, Sabine and Fonseca, Antonio and Nagy, Janos B. and Goovaerts, Etienne}, year={2008}, month=sep, pages={1930–1941} }

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