Vibrational excitations and low-energy electronic structure of epoxide-decorated graphene

E. C. Mattson; J. E. Johns; K. Pande; R. A. Bosch; S. Cui; M. Gajdardziska-Josifovska; M. Weinert; J. H. Chen; M. C. Hersam; C. J. Hirschmugl

doi:10.1021/jz4025386

Vibrational excitations and low-energy electronic structure of epoxide-decorated graphene

E. C. Mattson, J. E. Johns, K. Pande, R. A. Bosch, S. Cui, M. Gajdardziska-Josifovska, M. Weinert, J. H. Chen, M. C. Hersam, C. J. Hirschmugl

Chemistry (Twin Cities)

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42 Scopus citations

Abstract

We report infrared studies of adsorbed atomic oxygen (epoxide functional groups) on graphene. Two different systems are used as a platform to explore these interactions, namely, epitaxial graphene/SiC(0001) functionalized with atomic oxygen (graphene epoxide, GE) and chemically reduced graphene oxide (RGO). In the case of the model GE system, IR reflectivity measurements show that epoxide groups distort the graphene π bands around the K-point, imparting a finite effective mass and contributing to a band gap. In the case of RGO, epoxide groups are found to be present following the reduction treatment by a combination of polarized IR reflectance and transmittance measurements. Similar to the GE system, a band gap in the RGO sample is observed as well.

Original language	English (US)
Pages (from-to)	212-219
Number of pages	8
Journal	Journal of Physical Chemistry Letters
Volume	5
Issue number	1
DOIs	https://doi.org/10.1021/jz4025386
State	Published - Jan 2 2014

Keywords

adsorbates
band structure
epitaxial graphene
oxygen
reduced graphene oxide
vibrations

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10.1021/jz4025386

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abstract = "We report infrared studies of adsorbed atomic oxygen (epoxide functional groups) on graphene. Two different systems are used as a platform to explore these interactions, namely, epitaxial graphene/SiC(0001) functionalized with atomic oxygen (graphene epoxide, GE) and chemically reduced graphene oxide (RGO). In the case of the model GE system, IR reflectivity measurements show that epoxide groups distort the graphene π bands around the K-point, imparting a finite effective mass and contributing to a band gap. In the case of RGO, epoxide groups are found to be present following the reduction treatment by a combination of polarized IR reflectance and transmittance measurements. Similar to the GE system, a band gap in the RGO sample is observed as well.",

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AU - Mattson, E. C.

AU - Johns, J. E.

AU - Pande, K.

AU - Bosch, R. A.

AU - Cui, S.

AU - Gajdardziska-Josifovska, M.

AU - Weinert, M.

AU - Chen, J. H.

AU - Hersam, M. C.

AU - Hirschmugl, C. J.

PY - 2014/1/2

Y1 - 2014/1/2

N2 - We report infrared studies of adsorbed atomic oxygen (epoxide functional groups) on graphene. Two different systems are used as a platform to explore these interactions, namely, epitaxial graphene/SiC(0001) functionalized with atomic oxygen (graphene epoxide, GE) and chemically reduced graphene oxide (RGO). In the case of the model GE system, IR reflectivity measurements show that epoxide groups distort the graphene π bands around the K-point, imparting a finite effective mass and contributing to a band gap. In the case of RGO, epoxide groups are found to be present following the reduction treatment by a combination of polarized IR reflectance and transmittance measurements. Similar to the GE system, a band gap in the RGO sample is observed as well.

AB - We report infrared studies of adsorbed atomic oxygen (epoxide functional groups) on graphene. Two different systems are used as a platform to explore these interactions, namely, epitaxial graphene/SiC(0001) functionalized with atomic oxygen (graphene epoxide, GE) and chemically reduced graphene oxide (RGO). In the case of the model GE system, IR reflectivity measurements show that epoxide groups distort the graphene π bands around the K-point, imparting a finite effective mass and contributing to a band gap. In the case of RGO, epoxide groups are found to be present following the reduction treatment by a combination of polarized IR reflectance and transmittance measurements. Similar to the GE system, a band gap in the RGO sample is observed as well.

KW - adsorbates

KW - band structure

KW - epitaxial graphene

KW - oxygen

KW - reduced graphene oxide

KW - vibrations

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Vibrational excitations and low-energy electronic structure of epoxide-decorated graphene

Abstract

Keywords

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