Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment

Abstract 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 treatm...

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Autores principales:	Md Tanvir Hasan, Brian J. Senger, Conor Ryan, Marais Culp, Roberto Gonzalez-Rodriguez, Jeffery L. Coffer, Anton V. Naumov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d77054f69e734004b49f90e3e677e0a6
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spelling	oai:doaj.org-article:d77054f69e734004b49f90e3e677e0a62021-12-02T12:30:25ZOptical Band Gap Alteration of Graphene Oxide via Ozone Treatment10.1038/s41598-017-06107-02045-2322https://doaj.org/article/d77054f69e734004b49f90e3e677e0a62017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06107-0https://doaj.org/toc/2045-2322Abstract 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 sp2 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 sp2 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 sp2 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.Md Tanvir HasanBrian J. SengerConor RyanMarais CulpRoberto Gonzalez-RodriguezJeffery L. CofferAnton V. NaumovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Md Tanvir Hasan Brian J. Senger Conor Ryan Marais Culp Roberto Gonzalez-Rodriguez Jeffery L. Coffer Anton V. Naumov Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment
description	Abstract 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 sp2 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 sp2 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 sp2 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	article
author	Md Tanvir Hasan Brian J. Senger Conor Ryan Marais Culp Roberto Gonzalez-Rodriguez Jeffery L. Coffer Anton V. Naumov
author_facet	Md Tanvir Hasan Brian J. Senger Conor Ryan Marais Culp Roberto Gonzalez-Rodriguez Jeffery L. Coffer Anton V. Naumov
author_sort	Md Tanvir Hasan
title	Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment
title_short	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_sort	optical band gap alteration of graphene oxide via ozone treatment
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d77054f69e734004b49f90e3e677e0a6
work_keys_str_mv	AT mdtanvirhasan opticalbandgapalterationofgrapheneoxideviaozonetreatment AT brianjsenger opticalbandgapalterationofgrapheneoxideviaozonetreatment AT conorryan opticalbandgapalterationofgrapheneoxideviaozonetreatment AT maraisculp opticalbandgapalterationofgrapheneoxideviaozonetreatment AT robertogonzalezrodriguez opticalbandgapalterationofgrapheneoxideviaozonetreatment AT jefferylcoffer opticalbandgapalterationofgrapheneoxideviaozonetreatment AT antonvnaumov opticalbandgapalterationofgrapheneoxideviaozonetreatment
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Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment

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