Published January 1, 2016
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Journal article
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Reliable determination of the few-layer graphene oxide thickness using Raman spectroscopy
Creators
- 1. Slovak Acad Sci, Inst Phys, Dubravska Cesta 9, Bratislava 84511, Slovakia
- 2. Slovak Acad Sci, Inst Elect Engn, Dubravska Cesta 9, Bratislava 84104, Slovakia
- 3. Slovak Acad Sci, Inst Polymer, Dubravska Cesta 9, Bratislava 84541, Slovakia
Description
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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