Muhammad, I would recommend to measure the spectrum again in several points, you should increase an accumulation, probably vary a magnification and power to get more clean image because it seems that you have a small 2D. I still cannot see the exact positions of G and D bands. Generally, it can give you first understanding what is your material - graphene/graphite, amorph carbon. There are a certain shifts for them. Actually, Raman gives an approximate number of layers. In addition to 2d/g ratio estimation, the analysis of the peak width as well should be done. You can folow my example in paperArticle Silicon thin film on graphene coated nickel foam as an anode...

Hello,

It would be easier if you provide a spectrum image itself.

What is the positions of D and G bands?

Probably, your carbon is amorphous.

attached is the original Raman spectrum obtained.

Strong D peak indicate your sample includes a lot of defects, which can cause 2D peak to be wear or even not.

Which grating have you used during the measurement?

Noise is great, but 2D peak is well seen in your spectrum, Muhammad.

If the 2D peak is absent then it more likely to be graphite instead of graphene. I agree with Eugene that a 2D peak with very small intensity is seen. Try to take the ratio of the G peak to 2D peak to find out the number of layers in graphene. View this thread for more info.

https://www.researchgate.net/post/How_can_we_use_Raman_to_find_number_of_layers_of_graphene.

Muhammad, I would recommend to measure the spectrum again in several points, you should increase an accumulation, probably vary a magnification and power to get more clean image because it seems that you have a small 2D. I still cannot see the exact positions of G and D bands. Generally, it can give you first understanding what is your material - graphene/graphite, amorph carbon. There are a certain shifts for them. Actually, Raman gives an approximate number of layers. In addition to 2d/g ratio estimation, the analysis of the peak width as well should be done. You can folow my example in paperArticle Silicon thin film on graphene coated nickel foam as an anode...

Peak positions for D and G peak are 1330 and 1605 cm-1 respectively.

I am not very sure about the grating used for this measurement, I am trying to confirm. It is hard to say if there is any 2D peak present in such a noisy base. The spectra were measured on many points.

Attached is another spectrum obtained for the same sample at different point. The peak positions are 1335 and 1606 cm-1 for this spectrum.

This article is very useful in your case 10.1186/1556-276X-6-565.

Thank you, Aliya! A very interesting paper.

I know this.. I faced this before.. look at the attached image.

The presence of G & D band means you have some types of sp2 carbon with lots of defects... and this is most likely sp2 amorphous carbon. So you dont have graphene in your growth at all. In our case we had lots of impurity O2 atoms (from contaminated Gases) in our cvd chamber that resulted this amorphous carbon. Hopefully this is helpful to you guys.. good luck..

Thanks all

Dear Chandan,

Thank you for your input in this discussion. A similar Raman spectra without a 2D peak is also observed for my graphene sample which was basically prepared by complete reduction of graphene oxide. You may right this could be due to the amorphous nature of carbon structure and also containing significant defects in the structure. If you have any article in this direction, please send me, it will be a great professional help.