Electronic Structure of Isolated Graphene Nanoribbons in Solution Revealed by Two-Dimensional Electronic Spectroscopy

Structurally well-defined graphene nanoribbons (GNRs) are nanostructures with unique optoelectronic properties. In the liquid phase, strong aggregation typically hampers the assessment of their intrinsic properties. Recently we reported a novel type of GNRs, decorated with aliphatic side chains, yie...

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Published inNano Letters Vol. 24; no. 3; pp. 797 - 804
Main Authors Nagahara, Tetsuhiko, Camargo, Franco V. A., Xu, Fugui, Ganzer, Lucia, Russo, Mattia, Zhang, Pengfei, Perri, Antonio, de la Cruz Valbuena, Gabriel, Heisler, Ismael A., D’Andrea, Cosimo, Polli, Dario, Müllen, Klaus, Feng, Xinliang, Mai, Yiyong, Cerullo, Giulio
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 24.01.2024
American Chemical Society (ACS)
Subjects
Online AccessGet full text
ISSN1530-6984
1530-6992
1530-6992
DOI10.1021/acs.nanolett.3c02665

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Abstract Structurally well-defined graphene nanoribbons (GNRs) are nanostructures with unique optoelectronic properties. In the liquid phase, strong aggregation typically hampers the assessment of their intrinsic properties. Recently we reported a novel type of GNRs, decorated with aliphatic side chains, yielding dispersions consisting mostly of isolated GNRs. Here we employ two-dimensional electronic spectroscopy to unravel the optical properties of isolated GNRs and disentangle the transitions underlying their broad and rather featureless absorption band. We observe that vibronic coupling, typically neglected in modeling, plays a dominant role in the optical properties of GNRs. Moreover, a strong environmental effect is revealed by a large inhomogeneous broadening of the electronic transitions. Finally, we also show that the photoexcited bright state decays, on the 150 fs time scale, to a dark state which is in thermal equilibrium with the bright state, that remains responsible for the emission on nanosecond time scales.
AbstractList Structurally well-defined graphene nanoribbons (GNRs) are nanostructures with unique optoelectronic properties. In the liquid phase, strong aggregation typically hampers the assessment of their intrinsic properties. Recently we reported a novel type of GNRs, decorated with aliphatic side chains, yielding dispersions consisting mostly of isolated GNRs. Here we employ two-dimensional electronic spectroscopy to unravel the optical properties of isolated GNRs and disentangle the transitions underlying their broad and rather featureless absorption band. We observe that vibronic coupling, typically neglected in modeling, plays a dominant role in the optical properties of GNRs. Moreover, a strong environmental effect is revealed by a large inhomogeneous broadening of the electronic transitions. Finally, we also show that the photoexcited bright state decays, on the 150 fs time scale, to a dark state which is in thermal equilibrium with the bright state, that remains responsible for the emission on nanosecond time scales.
Structurally well-defined graphene nanoribbons (GNRs) are nanostructures with unique optoelectronic properties. In the liquid phase, strong aggregation typically hampers the assessment of their intrinsic properties. Recently we reported a novel type of GNRs, decorated with aliphatic side chains, yielding dispersions consisting mostly of isolated GNRs. Here we employ two-dimensional electronic spectroscopy to unravel the optical properties of isolated GNRs and disentangle the transitions underlying their broad and rather featureless absorption band. We observe that vibronic coupling, typically neglected in modeling, plays a dominant role in the optical properties of GNRs. Moreover, a strong environmental effect is revealed by a large inhomogeneous broadening of the electronic transitions. Finally, we also show that the photoexcited bright state decays, on the 150 fs time scale, to a dark state which is in thermal equilibrium with the bright state, that remains responsible for the emission on nanosecond time scales.Structurally well-defined graphene nanoribbons (GNRs) are nanostructures with unique optoelectronic properties. In the liquid phase, strong aggregation typically hampers the assessment of their intrinsic properties. Recently we reported a novel type of GNRs, decorated with aliphatic side chains, yielding dispersions consisting mostly of isolated GNRs. Here we employ two-dimensional electronic spectroscopy to unravel the optical properties of isolated GNRs and disentangle the transitions underlying their broad and rather featureless absorption band. We observe that vibronic coupling, typically neglected in modeling, plays a dominant role in the optical properties of GNRs. Moreover, a strong environmental effect is revealed by a large inhomogeneous broadening of the electronic transitions. Finally, we also show that the photoexcited bright state decays, on the 150 fs time scale, to a dark state which is in thermal equilibrium with the bright state, that remains responsible for the emission on nanosecond time scales.
Author Polli, Dario
Mai, Yiyong
Feng, Xinliang
Cerullo, Giulio
Heisler, Ismael A.
Ganzer, Lucia
Camargo, Franco V. A.
Müllen, Klaus
Russo, Mattia
de la Cruz Valbuena, Gabriel
D’Andrea, Cosimo
Xu, Fugui
Perri, Antonio
Zhang, Pengfei
Nagahara, Tetsuhiko
AuthorAffiliation IFN-CNR
School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules
Max Planck Institute for Polymer Research
Department of Chemistry and Materials Technology
Dipartimento di Fisica
Departamento de Física
Department of Chemistry and Food Chemistry
Universidade Federal do Paraná
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Keywords inhomogeneous broadening
graphene nanoribbons
vibronic coupling
two-dimensional electronic spectroscopy
ultrafast spectroscopy
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Snippet Structurally well-defined graphene nanoribbons (GNRs) are nanostructures with unique optoelectronic properties. In the liquid phase, strong aggregation...
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SubjectTerms graphene nanoribbons
inhomogeneous broadening
two-dimensional electronic spectroscopy
ultrafast spectroscopy
vibronic coupling
Title Electronic Structure of Isolated Graphene Nanoribbons in Solution Revealed by Two-Dimensional Electronic Spectroscopy
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