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dc.creatorHasan, Md. Tanvir
dc.creatorSenger, Brian J.
dc.creatorRyan, Conor
dc.creatorCulp, Marais
dc.creatorGonzalez-Rodriguez, Roberto
dc.creatorCoffer, Jeffery L.
dc.creatorNaumov, Anton V.
dc.date.accessioned2019-07-11T15:17:10Z
dc.date.available2019-07-11T15:17:10Z
dc.date.issued2017-07-25
dc.identifier.urihttps://doi.org/10.1038/s41598-017-06107-0
dc.identifier.urihttps://repository.tcu.edu/handle/116099117/26381
dc.identifier.urihttps://www.nature.com/articles/s41598-017-06107-0
dc.description.abstractGraphene 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.
dc.language.isoenen_US
dc.publisherNature Publishing Group
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourceScientific Reports
dc.subjectElectronic properties and materials
dc.subjectOptical properties and devices
dc.titleOptical Band Gap Alteration of Graphene Oxide via Ozone Treatment
dc.typeArticle
dc.rights.holderHasan et al.
dc.rights.licenseCC BY 4.0
local.collegeCollege of Science and Engineering
local.departmentPhysics and Astronomy
local.departmentChemistry and Biochemistry
local.personsHasan, Senger, Ryan, Naumov (PHYS); Gonzalez-Rodriguez, Coffer (CHEM)


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