Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 47, Issue 4, Pages 391-394Publisher
WILEY-BLACKWELL
DOI: 10.1002/jrs.4843
Keywords
graphene oxide; layer thickness
Categories
Funding
- Grant Agency VEGA Bratislava [2/0004/15, 2/0010/15, 2/0178/15, 2/0119/12]
- Competence center for new materials, advanced technologies, and energy
- Research and Development Operational Program - ESDF [26240220073]
- XOPTICS
- SAS-TUBITAK JRP [2013/6]
- COST Actions [CM1101, MP1307]
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We report on a reference-free Raman spectroscopy method for a precise thickness determination of the multilayered graphene oxide flakes. The method is based on the normalization of the total integral intensity of D and G Raman bands to the integral intensity of the second-order optical phonon peak of the silicon substrate in the Raman spectrum. The normalization provides discrete ratio values corresponding to the number of graphene oxide layers in the respective flakes with the intensity linearly increasing with the number of layers. This provides a fast and robust determination of the thickness of graphene oxide flakes in terms of the layer number up to high values. A comparison with conventional spectrally resolved reflectivity mapping shows similar sensitivity, while selectivity to particular functional chemical groups is a bonus of the Raman-based method. Copyright (c) 2015 John Wiley & Sons, Ltd.
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