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Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment
Graphene oxide (GO) is a graphene derivative that emits fluorescence, which makes GO an attractive material for optoelectronics and biotechnology. In this work, we utilize ozone treatment to controllably tune the band gap of GO, which can significantly enhance its applications. Ozone treatment in aq...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5527010/ https://www.ncbi.nlm.nih.gov/pubmed/28743864 http://dx.doi.org/10.1038/s41598-017-06107-0 |
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author | Hasan, Md Tanvir Senger, Brian J. Ryan, Conor Culp, Marais Gonzalez-Rodriguez, Roberto Coffer, Jeffery L. Naumov, Anton V. |
author_facet | Hasan, Md Tanvir Senger, Brian J. Ryan, Conor Culp, Marais Gonzalez-Rodriguez, Roberto Coffer, Jeffery L. Naumov, Anton V. |
author_sort | Hasan, Md Tanvir |
collection | PubMed |
description | Graphene oxide (GO) is a graphene derivative that emits fluorescence, which makes GO an attractive material for optoelectronics and biotechnology. In this work, we utilize ozone treatment to controllably tune the band gap of GO, which can significantly enhance its applications. Ozone treatment in aqueous GO suspensions yields the addition/rearrangement of oxygen-containing functional groups suggested by the increase in vibrational transitions of C-O and C=O moieties. Concomitantly it leads to an initial increase in GO fluorescence intensity and significant (100 nm) blue shifts in emission maxima. Based on the model of GO fluorescence originating from sp(2) graphitic islands confined by oxygenated addends, we propose that ozone-induced functionalization decreases the size of graphitic islands affecting the GO band gap and emission energies. TEM analyses of GO flakes confirm the size decrease of ordered sp(2) domains with ozone treatment, whereas semi-empirical PM3 calculations on model addend-confined graphitic clusters predict the inverse dependence of the band gap energies on sp(2) cluster size. This model explains ozone-induced increase in emission energies yielding fluorescence blue shifts and helps develop an understanding of the origins of GO fluorescence emission. Furthermore, ozone treatment provides a versatile approach to controllably alter GO band gap for optoelectronics and bio-sensing applications. |
format | Online Article Text |
id | pubmed-5527010 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-55270102017-08-02 Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment Hasan, Md Tanvir Senger, Brian J. Ryan, Conor Culp, Marais Gonzalez-Rodriguez, Roberto Coffer, Jeffery L. Naumov, Anton V. Sci Rep Article Graphene oxide (GO) is a graphene derivative that emits fluorescence, which makes GO an attractive material for optoelectronics and biotechnology. In this work, we utilize ozone treatment to controllably tune the band gap of GO, which can significantly enhance its applications. Ozone treatment in aqueous GO suspensions yields the addition/rearrangement of oxygen-containing functional groups suggested by the increase in vibrational transitions of C-O and C=O moieties. Concomitantly it leads to an initial increase in GO fluorescence intensity and significant (100 nm) blue shifts in emission maxima. Based on the model of GO fluorescence originating from sp(2) graphitic islands confined by oxygenated addends, we propose that ozone-induced functionalization decreases the size of graphitic islands affecting the GO band gap and emission energies. TEM analyses of GO flakes confirm the size decrease of ordered sp(2) domains with ozone treatment, whereas semi-empirical PM3 calculations on model addend-confined graphitic clusters predict the inverse dependence of the band gap energies on sp(2) cluster size. This model explains ozone-induced increase in emission energies yielding fluorescence blue shifts and helps develop an understanding of the origins of GO fluorescence emission. Furthermore, ozone treatment provides a versatile approach to controllably alter GO band gap for optoelectronics and bio-sensing applications. Nature Publishing Group UK 2017-07-25 /pmc/articles/PMC5527010/ /pubmed/28743864 http://dx.doi.org/10.1038/s41598-017-06107-0 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Hasan, Md Tanvir Senger, Brian J. Ryan, Conor Culp, Marais Gonzalez-Rodriguez, Roberto Coffer, Jeffery L. Naumov, Anton V. Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment |
title | Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment |
title_full | Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment |
title_fullStr | Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment |
title_full_unstemmed | Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment |
title_short | Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment |
title_sort | optical band gap alteration of graphene oxide via ozone treatment |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5527010/ https://www.ncbi.nlm.nih.gov/pubmed/28743864 http://dx.doi.org/10.1038/s41598-017-06107-0 |
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