Journal
ACS NANO
Volume 6, Issue 9, Pages 8203-8208Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn302878r
Keywords
graphene; quantum dot; size; shape; edge; photoluminescence
Categories
Funding
- National Research Foundation of Korea (NRF) [2011-0018306]
- Korea government (Ministry of Education, Science and Technology) (MEST) [2011-0017373, 2011-0014681]
- KISTI Supercomputing Center [KSC-2011-C3-06]
- National Research Foundation of Korea [2011-0014681, 2011-0018306] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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