期刊
ACS NANO
卷 6, 期 9, 页码 8203-8208出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn302878r
关键词
graphene; quantum dot; size; shape; edge; photoluminescence
类别
资金
- 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)
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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