Quantum confinement-induced tunable exciton states in graphene oxide

Graphene oxide has recently been considered to be a potential replacement for cadmium-based quantum dots due to its expected high fluorescence. Although previously reported, the origin of the luminescence in graphene oxide is still controversial. Here, we report the presence of core/valence excitons...

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Main Authors: Lee, Jaichan, Cole, Jacqueline M., Lee, Dongwook, Seo, Jiwon, Zhu, Xi, Lee, Jiyoul, Shin, Hyeon-Jin, Shin, Taeh, Lee, Hangil, Su, Haibin
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/98134
http://hdl.handle.net/10220/13316
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-981342023-07-14T15:44:47Z Quantum confinement-induced tunable exciton states in graphene oxide Lee, Jaichan Cole, Jacqueline M. Lee, Dongwook Seo, Jiwon Zhu, Xi Lee, Jiyoul Shin, Hyeon-Jin Shin, Taeh Lee, Hangil Su, Haibin School of Materials Science & Engineering Graphene oxide has recently been considered to be a potential replacement for cadmium-based quantum dots due to its expected high fluorescence. Although previously reported, the origin of the luminescence in graphene oxide is still controversial. Here, we report the presence of core/valence excitons in graphene-based materials, a basic ingredient for optical devices, induced by quantum confinement. Electron confinement in the unreacted graphitic regions of graphene oxide was probed by high resolution X-ray absorption near edge structure spectroscopy and first-principles calculations. Using experiments and simulations, we were able to tune the core/valence exciton energy by manipulating the size of graphitic regions through the degree of oxidation. The binding energy of an exciton in highly oxidized graphene oxide is similar to that in organic electroluminescent materials. These results open the possibility of graphene oxide-based optoelectronic device technology. Published version 2013-09-04T08:14:38Z 2019-12-06T19:51:07Z 2013-09-04T08:14:38Z 2019-12-06T19:51:07Z 2013 2013 Journal Article Lee, D., Seo, J., Zhu, X., Lee, J., Shin, H. J., Cole, J. M., Shin, T., Lee, J., Lee, H.,& Su, H. (2013). Quantum confinement-induced tunable exciton states in graphene oxide. Scientific Reports, 3. 2045-2322 https://hdl.handle.net/10356/98134 http://hdl.handle.net/10220/13316 10.1038/srep02250 23872608 en Scientific reports © 2013 Nature Publishing Group. This is Open Access Journals.This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported license. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
description Graphene oxide has recently been considered to be a potential replacement for cadmium-based quantum dots due to its expected high fluorescence. Although previously reported, the origin of the luminescence in graphene oxide is still controversial. Here, we report the presence of core/valence excitons in graphene-based materials, a basic ingredient for optical devices, induced by quantum confinement. Electron confinement in the unreacted graphitic regions of graphene oxide was probed by high resolution X-ray absorption near edge structure spectroscopy and first-principles calculations. Using experiments and simulations, we were able to tune the core/valence exciton energy by manipulating the size of graphitic regions through the degree of oxidation. The binding energy of an exciton in highly oxidized graphene oxide is similar to that in organic electroluminescent materials. These results open the possibility of graphene oxide-based optoelectronic device technology.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Lee, Jaichan
Cole, Jacqueline M.
Lee, Dongwook
Seo, Jiwon
Zhu, Xi
Lee, Jiyoul
Shin, Hyeon-Jin
Shin, Taeh
Lee, Hangil
Su, Haibin
format Article
author Lee, Jaichan
Cole, Jacqueline M.
Lee, Dongwook
Seo, Jiwon
Zhu, Xi
Lee, Jiyoul
Shin, Hyeon-Jin
Shin, Taeh
Lee, Hangil
Su, Haibin
spellingShingle Lee, Jaichan
Cole, Jacqueline M.
Lee, Dongwook
Seo, Jiwon
Zhu, Xi
Lee, Jiyoul
Shin, Hyeon-Jin
Shin, Taeh
Lee, Hangil
Su, Haibin
Quantum confinement-induced tunable exciton states in graphene oxide
author_sort Lee, Jaichan
title Quantum confinement-induced tunable exciton states in graphene oxide
title_short Quantum confinement-induced tunable exciton states in graphene oxide
title_full Quantum confinement-induced tunable exciton states in graphene oxide
title_fullStr Quantum confinement-induced tunable exciton states in graphene oxide
title_full_unstemmed Quantum confinement-induced tunable exciton states in graphene oxide
title_sort quantum confinement-induced tunable exciton states in graphene oxide
publishDate 2013
url https://hdl.handle.net/10356/98134
http://hdl.handle.net/10220/13316
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