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Fabrication of graphene quantum dots and quantum size effect in photoluminescence
| Content Provider | Semantic Scholar |
|---|---|
| Author | Nakajima, Kensuke |
| Copyright Year | 2013 |
| Abstract | Previous study shows photoluminescence (PL) of graphene can be understood by a model of thermal emission (Planck’s law) which involves upconvert part [1]. The emission process has a very fast relaxation time (about 100fs) via strongly coupled optical phonons (SCOPs) [1]. This suggests that the PL properties can be modified by using graphene quantum dots (GQDs) because of its quantum size effect. In this study, we fabricated GQDs by novel process with metal-nanoparticle masks, and measured the optical properties of GQDs. The GQDs is prepared by etching with Au-particle masks. We prepared a graphene on SiO2 substrate by peeling with a tape, and Au was deposited on the graphene. After annealing, we observed the Au nanoparticles and graphene by an atomic-force microscope (AFM) and a scanning electron microscope (SEM). The Au particles were removed in aqua regia and GQDs were obtained. These GQDs were measured by PL. The PL shows the distinct peak-shaped spectrum, which is quite different from that from pristine graphene. This work was partially supported by the A-step from JST. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.jps.or.jp/APPC12Program/pdf/A2-PTu-10.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
