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Anomalous Behaviors of Visible Luminescence from Graphene Quantum Dots: Interplay between Size and Shape
Cited 525 time in
Web of Science
Cited 555 time in Scopus
- Authors
- Issue Date
- 2012-09
- Publisher
- American Chemical Society
- Citation
- ACS Nano, Vol.6 No.9, pp.8203-8208
- Abstract
- For the application of graphene quantum dots (GQDs) to optoelectronic nanodevices, it is of critical importance to understand the mechanisms which result in novel phenomena of their light absorption/emission. Here, we present size-dependent shape/edge-state variations of GQDs and visible photoluminescence (PL) showing anomalous size dependences. With varying the average size (d(a)) of GQDs from 5 to 35 nm, the peak energy of the absorption spectra monotonically decreases, while that of the visible PL spectra unusually shows nonmonotonic behaviors having a minimum at d(a) = similar to 17 nm. The PL behaviors can be attributed to the novel feature of GQDs, that is, the circular-to-polygonal-shape and corresponding edge-state variations of GQDs at d(a) = similar to 17 nm as the GQD size increases, as demonstrated by high-resolution transmission electron microscopy.
- ISSN
- 1936-0851
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