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

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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.
Publisher
한국진공학회
Issue Date
2015-07
Language
Korean
Article Type
Article
Citation

한국진공학회지, v.24, no.4, pp.111 - 116

ISSN
2288-6559
DOI
10.5757/ASCT.2015.24.4.111
URI
http://hdl.handle.net/10203/208872
Appears in Collection
CBE-Journal Papers(저널논문)PH-Journal Papers(저널논문)
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