University of Sussex
Browse
srep19491.pdf (598.54 kB)

A new Raman metric for the characterisation of graphene oxide and its derivatives

Download (598.54 kB)
journal contribution
posted on 2023-06-09, 13:11 authored by Alice KingAlice King, Benjamin R Davies, Nikan Noorbehesht, Peter Newman, Tamara L Church, Andrew T Harris, Joselito M Razal, Andrew I Minett
Raman spectroscopy is among the primary techniques for the characterisation of graphene materials, as it provides insights into the quality of measured graphenes including their structure and conductivity as well as the presence of dopants. However, our ability to draw conclusions based on such spectra is limited by a lack of understanding regarding the origins of the peaks. Consequently, traditional characterisation techniques, which estimate the quality of the graphene material using the intensity ratio between the D and the G peaks, are unreliable for both GO and rGO. Herein we reanalyse the Raman spectra of graphenes and show that traditional methods rely upon an apparent G peak which is in fact a superposition of the G and D’ peaks. We use this understanding to develop a new Raman characterisation method for graphenes that considers the D’ peak by using its overtone the 2D’. We demonstrate the superiority and consistency of this method for calculating the oxygen content of graphenes, and use the relationship between the D’ peak and graphene quality to define three regimes. This has important implications for purification techniques because, once GO is reduced beyond a critical threshold, further reduction offers limited gain in conductivity.

History

Publication status

  • Published

File Version

  • Published version

Journal

Scientific Reports

ISSN

2045-2322

Publisher

Nature Publishing Group

Issue

1

Volume

6

Page range

19491 1-6

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Materials Physics Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-05-09

First Open Access (FOA) Date

2018-05-09

First Compliant Deposit (FCD) Date

2018-05-08

Usage metrics

    University of Sussex (Publications)

    Categories

    No categories selected

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC