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sp2/sp3 bonding ratio dependence of the band-gap in graphene oxide

Author

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  • Ebrahim Akbari

    (Sharif University of Technology)

  • Iman Akbari

    (Yasuj University)

  • Mohammad Reza Ebrahimi

    (Sharif University of Technology)

Abstract

Although the band-gap in pure graphene is zero, the oxygenated graphene could have a considerable band-gap. The D/G peak intensity ratio is known as a measure of the size of sp3∕sp2 domains in graphene oxide (GO) sheets and determines the band-gap in GO sheets. Characterization results showed that the photoluminescence (PL) spectra of GO suspensions has a peak at ~604 nm and also the I(D)/I(G) intensity ratio of GO suspensions is 1.73. After reduction, a redshift appeared at PL spectrum (at 650 nm) and the I(D)/I(G) intensity ratio decrease to 1.26. Our results showed that the band-gap in GO is related to the I(D)/I(G) intensity ratio of GO suspensions and offers a mechanism for measuring the band gap according to Raman spectra. Moreover, GO is fluorescent over a broad range of wavelengths and can be used in the biological application. Graphical abstract

Suggested Citation

  • Ebrahim Akbari & Iman Akbari & Mohammad Reza Ebrahimi, 2019. "sp2/sp3 bonding ratio dependence of the band-gap in graphene oxide," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 92(4), pages 1-6, April.
    • Handle: RePEc:spr:eurphb:v:92:y:2019:i:4:d:10.1140_epjb_e2019-90675-y
    DOI: 10.1140/epjb/e2019-90675-y
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    Solid State and Materials;

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