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sp 2/sp 3 bonding ratio dependence of the band-gap in graphene oxide

Akbari, E ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1140/epjb/e2019-90675-y
  3. Publisher: Springer Heidelberg , 2019
  4. Abstract:
  5. 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: [Figure not available: see fulltext.]
  6. Keywords:
  7. Solid State and Materials ; Graphene ; Biological applications ; Bonding ratio ; Intensity ratio ; Peak intensity ratio ; Photoluminescence spectrum ; PL spectra ; Energy gap
  8. Source: European Physical Journal B ; Volume 92, Issue 4 , 2019 ; 14346028 (ISSN)
  9. URL: https://link.springer.com/article/10.1140/epjb/e2019-90675-y