Graphene Number of Layers Calculator From ID/IG and I2D/IG Ratio via Raman Spectroscopy

Graphene Number of Layers Calculator From ID/IG and I2D/IG Ratio via Raman Spectroscopy

Number of Layers Calculator from ID/IG Ratio


G Band Intensity

D Band Intensity


Results
ID/IG Ratio
Number of Layers

Number of Layers Calculator from I2D/IG Ratio


G Band Intensity

2D Band Intensity


Results
I2D/IG Ratio
Number of Layers

THEORY BEHIND CALCULATIONS:

Raman Spectroscopy is the best technique for the qualitative analysis of the Graphene.
Single, Double, Few & Multi Layer Graphene can be determined by the: Peak Position, Peak Intensity and Peak Broadening of the Raman Spectra. Ideal Raman Spectra for Graphene is given below:

raman of single layer graphene raman of double layer graphene raman of few layer graphene raman of multi layer graphene

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  1. Really you are trying life simple. You made me to have clear picture about the concept.

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  2. Can you suggest us references for supporting the explanation, please?

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  3. Siva Reddy Kasireddy23 August 2017 at 12:39

    Insta NANO is highly useful for me in clearing my doubts.

    Thanks.

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  4. Care must be taken with the first method, G band peak position. There need to be not strain present as that will shift the peak to lower wavenumber and any presence of doping will also influence the peak position.
    Method 2) 2D:G band ratio will give a good indication of single layer graphene with the ratio being around 2 or higher. The band shape however may distort the shape of the 2D band causing broadening. This is particularly evident for Bernal stacking of layers that is seen in HOPG graphene that has been exfoliated. In regards to CVD grown graphene the 2D:G may be more appropriate.
    I have seen that exfoliated Graphene layer thickness follows a linear trend in G band intensity at upto 19 layers presenting a very good way to determine layer thickness for those samples. Here is a link to an application note I authored on the topic:
    https://tools.thermofisher.com/content/sfs/brochures/AN52252_E%201111%20LayerThkns_H_1.pdf
    By the way, the figure in method 1 was taken from my work

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  5. if we don't have a 2d peak in raman can we still get the graphene or 2d is compulsory condition for graphene

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  6. 2D band is not necessary for Graphene Oxide

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  7. 2D band necessery to call it as a graphene or 2 dimensional resonance accord.
    Please do correct me if I am wrong..

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  8. How can I determine the level of doping in a graphene from a Raman spectrum? What is exactly the formula I should use?

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    Replies
    1. The G-band frequency and line width are used to monitor the doping level.

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  9. I really appreciate the extra help I get from the author of this website!!! May God bless you!!!

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  10. Intensity ratio means Ratio of counts or area under the peaks ?

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