Growth and optical properties of colloidal graphene quantum dots

Synthetic progress has led to growth of monodisperse colloidal graphene quantum dots large enough that the lowest‐energy electronic states can be understood in terms of confined Dirac fermions. Appropriate ligands inhibit aggregation and promote solubility that now permit optical studies of excitons...

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Bibliographic Details
Published in:Physica status solidi. PSS-RRL. Rapid research letters 2016-01, Vol.10 (1), p.91-101
Main Author: McGuire, John A.
Format: Article
Language:English
Subjects:
biexciton binding
Carbon
excitons
graphene quantum dots
Optical properties
Quantum dots
synthesis
transient absorption
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Summary:Synthetic progress has led to growth of monodisperse colloidal graphene quantum dots large enough that the lowest‐energy electronic states can be understood in terms of confined Dirac fermions. Appropriate ligands inhibit aggregation and promote solubility that now permit optical studies of excitons and biexcitons formed of Dirac fermions in ensembles of individual quantum dots. Here we review recent progress in synthesis and understanding of the optical properties and dynamics of colloidal graphene quantum dots as well as related aspects of other nanoscale graphene structures and polycyclic aromatic hydrocarbons. We highlight graphene quantum dots that are fully benzenoid and discuss challenges in studying colloidal graphene quantum dots with zigzag edges. Graphene quantum dot (C168) consisting of 168 sp2 hybridized C atoms. R indicates ligands. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) Part of Focus Issue on ”Carbononics” (Eds.: Pawel Hawrylak, Francois Peeters, Klaus Ensslin) Colloidal graphene quantum dots can now be produced at sizes where the low‐energy electronic structure can be described in terms of confined massless Dirac fermions. In these systems, Coulomb interactions scale with size in the same way as the confinement energy giving rise to unusually strong exciton interactions. The synthesis, electronic structure, and optical properties of colloidal graphene quantum dots is reviewed.
ISSN:1862-6254
1862-6270
DOI:10.1002/pssr.201510287