DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jang, Min-Ho | ko |
dc.contributor.author | Ha, Hyun Dong | ko |
dc.contributor.author | Lee, Eui-Sup | ko |
dc.contributor.author | Liu, Fei | ko |
dc.contributor.author | Kim, Yong-Hyun | ko |
dc.contributor.author | Seo, Tae Seok | ko |
dc.contributor.author | Cho, Yong-Hoon | ko |
dc.date.accessioned | 2016-04-14T02:52:16Z | - |
dc.date.available | 2016-04-14T02:52:16Z | - |
dc.date.created | 2015-06-25 | - |
dc.date.created | 2015-06-25 | - |
dc.date.created | 2015-06-25 | - |
dc.date.issued | 2015-08 | - |
dc.identifier.citation | SMALL, v.11, no.31, pp.3773 - 3781 | - |
dc.identifier.issn | 1613-6810 | - |
dc.identifier.uri | http://hdl.handle.net/10203/203691 | - |
dc.description.abstract | Graphene-based quantum dots (QDs) have received a tremendous amount of attention as a new type of light-emitting materials. However, their luminescence origins remain controversial due to extrinsic states of the impurities and disorder structures. Especially, the function of oxygen-contents should be understood and controlled as a crucial element for tuning the optical properties of graphene-based QDs. Herein, a series of graphene oxide QDs (GOQDs) with different amounts of oxygen-contents are first synthesized via a direct oxidation route of graphite nanoparticle and thoroughly compared with a series of reduced GOQDs (rGOQDs) prepared by the conventional chemical reduction. Irreversible emission and different carrier dynamics are observed between the GOQDs and rGOQDs, although both routes show a similar tendency with regard to the variation of oxygen-functional components. Their luminescence mechanisms are closely associated with different atomic structures. The mechanism for the rGOQDs can be associated with a formation of small sp(2) nanodomains as luminescent centers, whereas those of GOQDs may be composed of oxygen-islands with difference sizes depending on oxidation conditions surrounded by a large area of sp(2) bonding. Important insights for understanding the optical properties of graphene-based QDs and how they are affected by oxygen-functional groups are shown. | - |
dc.language | English | - |
dc.publisher | WILEY-V C H VERLAG GMBH | - |
dc.title | Is the Chain of Oxidation and Reduction Process Reversible in Luminescent Graphene Quantum Dots? | - |
dc.type | Article | - |
dc.identifier.wosid | 000359908900007 | - |
dc.identifier.scopusid | 2-s2.0-84939268323 | - |
dc.type.rims | ART | - |
dc.citation.volume | 11 | - |
dc.citation.issue | 31 | - |
dc.citation.beginningpage | 3773 | - |
dc.citation.endingpage | 3781 | - |
dc.citation.publicationname | SMALL | - |
dc.identifier.doi | 10.1002/smll.201500206 | - |
dc.contributor.localauthor | Kim, Yong-Hyun | - |
dc.contributor.localauthor | Seo, Tae Seok | - |
dc.contributor.localauthor | Cho, Yong-Hoon | - |
dc.contributor.nonIdAuthor | Ha, Hyun Dong | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | graphene oxide quantum dots | - |
dc.subject.keywordAuthor | graphene quantum dots | - |
dc.subject.keywordAuthor | oxidation | - |
dc.subject.keywordAuthor | reduction | - |
dc.subject.keywordAuthor | photoluminescence | - |
dc.subject.keywordPlus | AUGMENTED-WAVE METHOD | - |
dc.subject.keywordPlus | CARBON-FIBERS | - |
dc.subject.keywordPlus | OXIDE | - |
dc.subject.keywordPlus | PHOTOLUMINESCENCE | - |
dc.subject.keywordPlus | GRAPHITE | - |
dc.subject.keywordPlus | SURFACE | - |
dc.subject.keywordPlus | BLUE | - |
dc.subject.keywordPlus | EMISSION | - |
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