Hello, everyone
I have a question for confirmation about reduciton of graphene oxide in raman spectroscopy.
I understood D peak and G peak in raman like as
D band ~ SP3 carbon or defects on graphene sheet
G band ~ originated from in-plane vibration of SP2-carbon atom
After reducing graphene oxide, relatively peak intensity (Id/Ig) is increasing.
e.g. graphene oxide id/ig=0.8 to reduced graphene oxide id/ig=1.0 or above
Also, reduced graphene oxide is known as ehnaced electrical conductivity compared than graphene oxide.
In this point, I have a question.
Many reserachers said that increased Id/Ig meant degree of reduction and came from increased defects (decreased sized of sp2 domain).
If the sp2 domain has increased defects, I wonder if the conductivity is rather low.
If this is wrong, please explain in detail.
How can I understand that? (relation in increased id/ig, increased defects, and increased conductivity)
Also, reduced graphene oxide by gratfing polymer vs. hydrothermally reduced graphene oxide.
Have a nice day!
Hi Soochan,
There are many reports stating that the D/G ratio increase for reduced graphene oxide as compared to graphene oxide. In my experiment also I have found such kind of trait. Please follow my recent article for understanding.
10.1016/j.jallcom.2019.05.302
All the best.
In my opinion, ID/IG increases due to the defects introduced by the removal of oxygen-containing species, they could turn into gas and destroy the graphene structure
Soochan Kim In GO there are alot of functional groups attached to the carbon atoms due to which the electrical conductivity is extremely low. Once you reduce the GO (RGO), the functional groups are eliminated, this is the main reason why the conductivity is high for RGO.
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