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http://dx.doi.org/10.5757/ASCT.2015.24.4.111

Direct Comparison of Optical Properties from Graphene Oxide Quantum Dots and Graphene Oxide  

Jang, Min-Ho (Department of Physics and Graphene Research Center of KI for the NanoCentury, Korea Advanced Institute of Science and Technology)
Ha, Hyun Dong (Department of Chemical and Biomolecular Engineering and Institute for the BioCentury, Korea Advanced Institute of Science and Technology)
Seo, Tae Seok (Department of Chemical and Biomolecular Engineering and Institute for the BioCentury, Korea Advanced Institute of Science and Technology)
Cho, Yong-Hoon (Department of Physics and Graphene Research Center of KI for the NanoCentury, Korea Advanced Institute of Science and Technology)
Publication Information
Applied Science and Convergence Technology / v.24, no.4, 2015 , pp. 111-116 More about this Journal
Abstract
The graphene oxide (GO) and graphene oxide quantum dots (GOQDs), which have gained research interest as new types of light-emitting materials, were synthesized by the modified Hummers method for oxidation of graphite flake and graphite nanoparticle. The optical properties of GO and GOQDs have been compared by mean of photoluminescence (PL), PL excitation (PLE), UV-vis absorbance, and time-resolved PL. The GO have an absorption peak at 229 nm and shoulder part at 310 nm, whereas the GOQDs show broad absorption with a gradual change up without any absorption peaks. The PL emission of GOQDs and GO showed the green color at 520 nm and the red color at 690 nm, respectively. The red emission of GO showed faster PL decay time than the green emission of GOQDs. In particular, the temporal PL profile of the GO showed redshift from 560 nm to 660 nm after the pump event.
Keywords
Graphene oxide; Graphene quantum dot; Graphene oxide quantum dot; Photoluminescence; Time-resolved photoluminescence;
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