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Structural model of oxidatively unzipped narrow single-walled carbon nanotubes

L. Merkel, A. Setaro, C. E. Halbig, S. Shimizu, T. Yoshii, H. Nishihara, T. Hilal, G. Algara-Siller, C. Koch, S. Eigler – 2024

In this study, we present a synthetic method for the preparation of oxo-graphene nanoribbons (oxo-GNRs) by oxidative cleavage of C–C bonds of enriched (6,5)-single-walled carbon nanotubes (SWCNTs). We applied a mild oxidation protocol to oxidize SWCNTs involving sulfuric acid as dispersion medium and potassium permanganate as oxidant. The obtained oxo-GNRs exhibit stunning fluorescence properties with emission maxima of about 300 nm and 400 nm, respectively, depending on oxidation time. The analyses reveal that functional oxo-groups are predominantly located at the rims of oxo-GNRs. Next to lactones, 1,3-ketones are identified, which can be further reacted with hydrazine, most likely forming pyrazoline groups. Based on our data, we propose a chemical structure model for the oxo-GNRs. The model is based on an intact inner π-system, responsible for photoluminescence properties and oxo-functionalized rims of GNRs.

Title
Structural model of oxidatively unzipped narrow single-walled carbon nanotubes
Author
L. Merkel, A. Setaro, C. E. Halbig, S. Shimizu, T. Yoshii, H. Nishihara, T. Hilal, G. Algara-Siller, C. Koch, S. Eigler
Date
2024
Identifier
10.1016/j.carbon.2024.119454
Citation
Carbon 2024 Vol. 229 Pages 119454
Language
eng
Type
Text