I know the two peaks are found the 'G' at 1480- 1580 cm-1 and 'D" at 1320- 1440 cm-1. But I didn't got two peaks while preparing modified GO materials rather a single peak at 1560 cm-1. What is the significance of the peak at 2600 cm-1?
Dear Behra,
Basically G and D- peaks of Graphene/GO signifies sp2 hybridisation (graphitic signature of carbon ) and disorder due to the defects induced on the sp2 hybridized hexagonal sheet of the carbon respectively.
Range of G ~ 1500-1600 cm-1
Range of D ~ 1300-1400 cm-1
In the case of GO the intensity and line-width of D is larger than G indicates the more desorder due to defects
from strong treatment with chemicals, and amorphous carbon content will be more(1300-1450 cm-1) i.e sp3 cluster is more than sp2.
peak from 2650~2700 called 2nd order desorder mode(2D) for carbon nano material.
In the case of graphene it is not due to the desorder significant for double resonance of scattered photons by excitation wavelength and signature for the layer number, area and qulity of the graphene
intensity of the 2D should be more than G.
go through MS.Dresselhaus and G.Dresselhaus for more details
Annual Review of Condensed Matter Physics is
online at conmatphys.annualreviews.org
got it..
That's correct, peak 2D (double tone of D) appear without peak D when you have a high cristallinity surface, you can read papers of Andrea Ferrari from Manchester University, He explain very well about graphitic signals in Raman
Peak width and intensity of G & D peaks in Graphene are substrate-dependent.. and D peak is more obvious in chemically derived graphene(CDG) and its rarely see in CVD graphene (due to less defects).. If you are working on CDG, read papers by Prof. Ruoff or Hongje Dai.. if CVD graphene, then Dresselhaus is the ultimate.. He's like GOD of Raman spectra of all carbonaceous materials.
Thank you very much for your suggestion. I'll go through that paper.
The real expert of Raman spectra from carbonaceous materials is neither Ruoff nor Dai, BUT Dresselhaus, Eklund, Jorio, Robertson/Ferrari etc. who greatly contributed to the work etc.
In my recent paper titled Temporospatial Control of Graphene Wettability, I have compared Raman spectra of single layer graphene and single layer graphene oxide with different oxygen content. It might help you.
http://onlinelibrary.wiley.com/doi/10.1002/adma.201503444/abstract
This link is really useful,
http://www.instanano.com/characterization/experimental/raman-graphene/
Recently, I synthesized one kind of carbonaecous material. Only one wide peak at 1450 cm -1 could be found instead of the D and G peaks, Why? can you tell me something about the peaks ? Thank you.
what is basically this D and G represents...? or what does it designate...? any full form...?
Answer:
D represents to Defect region and G represents to Graphitic region
how to differentiate amorphous carbon and defect region in the D band?
I have already searched some articles where they used cross-verification by oxidation techniques
is there another way to differentiate the defect-rich carbon and amorphous carbon by Raman spectra?
Article Elimination of D-band in Raman spectra of double-wall carbon...
All kinds of sp2 carbon materials exhibit a strong peak in the range 2500 - 2800 cm-1 in the Raman spectra. Combined with the G-band, this spectrum is a Raman signature of graphitic sp2 materials and is called 2D(G*)-band. 2D-band is a second-order two-phonon process and exhibits a strong frequency dependence on the excitation laser energy.
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