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Article Dans Une Revue Nanoscale Année : 2022

Vibronic effect and influence of aggregation on the photophysics of graphene quantum dots

Claire Tonnelé
Yannick Chassagneux
Christophe Voisin
David Beljonne

Résumé

Graphene quantum dots, atomically precise nanopieces of graphene, are promising nanoobjects with potential applications in various domains such as photovoltaics, quantum light emitters or bio-imaging. Despite their interesting prospects, precise reports on their photophysical properties remain scarce. Here, we report on a study of the photophysics of C$_{96}$H$_{24}$(C$_{12}$H$_{25}$) graphene quantum dots. A combination of optical studies down to the single molecule level with advanced molecular modeling demonstrates the importance of the coupling to vibrations in the emission process. Optical fingerprints for H-like aggregates are identified. Our combined experimental-theoretical investigations provide a comprehensive description of the light absorption and emission properties of nanographenes, which not only represents an essentiel step towards precise control of sample production, but also paves the way for new exciting physics focused on twisted graphenoid.
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Dates et versions

hal-03548812 , version 1 (31-01-2022)

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Thomas Liu, Claire Tonnelé, Shen Zhao, Loïc Rondin, Christine Elias, et al.. Vibronic effect and influence of aggregation on the photophysics of graphene quantum dots. Nanoscale, 2022, ⟨10.1039/D1NR08279E⟩. ⟨hal-03548812⟩
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