I know the intensity of d band peak and g band peak, but I don't know how to calculate ID/IG can anyone explain? Thanks in advance.
I am also working with Graphene. You have to calculate the peak area of both the bands (D-band@1350 and G-band@1582) by peak fiting. The proportional values known as iD/iG ratio to confirm the defect ratio in graphene or graphite.
You can use XPSPeak41 software for the same.
if is only graphene, should have the vibrational breathing mode of the hexagonals, because is not an amorphous should have a very sharp peak, close to a lorentzian than a gaussian. Please revise the papers of robertson, amaratunga on this.
The above peak is for graphene with silver nanowires sir, what are the informations i can get from this above image.
One of the way is to fit "G" and "D" band by two bans at the same time. Also may be usefull to fit G or D band by not one, but two or more Lorenzian/Gaussian functions. But all subbands have to be fitted together.
This spectra is not very simmilar to graphene. It more looks like amorphous carbon Ferrari and J. Robertson, Physical Review B 61, 14095 (2000), graphene oxide or buffer layer on SiC(0001)(but this one is impossible). Could You please make a spectrum with smaller noise? On this one it is not obvius if those "D" or "G" band are realy those band- maybe there are other band in the v ery same place.
I have't ever measured graphene with silver nanowires, but if those nanowires doesn't change the band structure of graphene, it shouldn't look like that.
I agree with Kacper, this actually looks more like an unhydrogenated DLC.
Plz smooth the curve to get the intensity values clearly to calculate the Id/Ig ration.It can be done in origin software very easily. After smoothing Just take the intensity values of the (y Axis) of the defect and graphictic band
Intensity of D band/Intensity of G band = Id/Ig ration.
This is not graphene Raman spectra because in Graphene second order defect are very large (2D band very high). It seems you got amorphous carbon or graphene oxide.....
I was recently told that you have to fit your spectra first to obtain the iD/iG proportional value. It would be wise to confirm with another characterization technique your structure first. Depending on the synthesis process of your graphene, this information is very important and can lead you to explain why the increase on the D band and the low 2D peak. The structure can be doped with functional groups or even doped with another material typically nitrogen or boron. Reference of doped graphene raman spectra [10.1021/nn103584t]. Another tricky part is the measurment,of the sample. I hope this is useful to you.
Regards.
I am also working with Graphene. You have to calculate the peak area of both the bands (D-band@1350 and G-band@1582) by peak fiting. The proportional values known as iD/iG ratio to confirm the defect ratio in graphene or graphite.
You can use XPSPeak41 software for the same.
Dear Gnanaprakasam ,
Recently I have published an article which can give you a clear answer to your query. you can use iwire software for the Raman peak analysis.
Article; Quantitative Analyses of MWCNT-Ti Powder Mixtures using Raman Spectroscopy: The Influence of Milling Parameters on Nanostructural Evolution
Link: http://onlinelibrary.wiley.com/doi/10.1002/adem.201500142/abstract
Best wishes,
Khurram
Dear p. Gnanaprakasam
can you please share with us, on which substrate did u get this Raman Spectra?
It looks like you have some metal contaminants probably Ni.
if its so, then before measuring D/G or 2D/G its better to transfer the grown graphene to a clean SiO2/Si substrate.
This link is really useful,
http://www.instanano.com/characterization/experimental/raman-graphene/
You can either choose area or intensity!
Typically in the range of low defect we can consider area else consider intensity
For your case, simply take the intensity peak and divided the disordered band by graphitic band. Otherwise, you should fit the peak first and calculated by area this will not suit for your case...
After fitting the D and G peaks with gaussian/lorentz, do you measure the area ratio or just the intensity ratio?
Measure the intensity ratio of D band and G band then insert value Intensity ratio of D band and G band (ID /IG) and calculate
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