How to calculate graphene layer from Raman mapping?

Dear Suparna Saha,

In addressing your inquiry, I draw from my own experience encountering a similar question in my research.

The Raman spectra indeed offer valuable insights into graphene-related materials beyond merely indicating the number of layers. My suggestion is to focus on the Raman shift range of 400 to 3250 cm^(-1), with particular emphasis on the 2D band. This range is crucial for discerning pertinent information.

If your objective is to confirm graphene formation and estimate the number of layers from a Raman spectrum, I recommend referring to the orientations outlined in ISO/TS 21356–1:2021. This standard provides a valuable framework to differentiate between graphene, graphene oxide, and reduced graphene oxide. By assessing the shape and intensity ratios between the D, G, and 2D bands, you can classify your samples into categories such as single-layer graphene, few layers of graphene (2-3 layers), graphene nanoplates (less than 10 layers), or graphite.

For a more in-depth analysis, particularly if you aim to calculate the number of layers and their distribution, a robust methodology is essential. This involves combining various techniques such as AFM and TEM, along with machine learning algorithms. I recommend exploring the approach developed by Silva et al. (https://www.sciencedirect.com/science/article/abs/pii/S0008622320300567), which employs a combination of these methods for a comprehensive assessment.

In our recent work (DOI: 10.1016/j.flatc.2023.100542), we extensively evaluated and discussed different graphene samples using both the ISO/TS 21356–1:2021 orientations and the advanced methodology proposed by Silva et al. This dual approach provided a comprehensive understanding of the characteristics and properties of diverse graphene materials.

I hope these recommendations prove helpful in advancing your research.

Please feel free to reach out if you have any further questions or require additional assistance.

Best regards,

Erick dos Anjos

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