We have synthesized 'graphene' on the MO-GaN with ethylene. As you can see in the raman spectrum, the 2D peak is disappeared. Can anyone help me explain this phenomenon? Thanks a lot !
I would guess this would mean you dont actually have good quality graphene? Perhaps CNTs (or even grphene) which are heavily oxidised?
See for example Raman in http://dx.doi.org/10.1039/C3TA13292G
This might be due to the formation of disordered graphene with multi layers overlapped with plenty of oxygenated functional groups.....
There are amorph carbon and a little bit DLC. Thickness very high for 2d band.
Thank you very much for all your answer! We have characterized this sample by SEM with EDX. But the oxygen had not been detected.
2D-band is very sensitive to the stacking order of the graphene layers along the c-axis. So if 2D-band disappeared means there is no ordering at all along the c-axis (perpendicular direction to each graphene sheet).
Please read the paper "The chemical and structural analysis of graphene oxide with different degrees of oxidation, C A R B ON 5 3 ( 2 0 1 3 ) 3 8 –4 9" for further details.
This link is really useful,
http://www.instanano.com/characterization/experimental/raman-graphene/
HI ZongYao Li
Seems like you synthetized a multilayer and high defect graphene (or graphene oxide), you should revise the parameters of your synthesis method for the obtention of good quality graphene of few, bi or mono layer system.
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