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

Ebrahim Akbari (), Iman Akbari and Mohammad Reza Ebrahimi
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Ebrahim Akbari: Sharif University of Technology
Iman Akbari: Yasuj University
Mohammad Reza Ebrahimi: Sharif University of Technology

The European Physical Journal B: Condensed Matter and Complex Systems, 2019, vol. 92, issue 4, 1-6

Abstract: 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

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1140/epjb/e2019-90675-y

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